Hendrik Lipka
Stripped down version of Segundos NetService library (http://mbed.org/users/segundo/libraries/NetServices ). I have removed all NetServices, and all functions which had been disabled. Use this version when you need only pure TCP or UDP functions - this library compiles faster.
Dependents: christmasLights device_server pop3demo device_server_udp ... more
Diff: lwip/core/dhcp.c
- Revision:
- 1:9d93f4dc2f46
- Parent:
- 0:8b387bed54c2
diff -r 8b387bed54c2 -r 9d93f4dc2f46 lwip/core/dhcp.c
--- a/lwip/core/dhcp.c Mon Jan 10 21:03:11 2011 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1725 +0,0 @@
-/**
- * @file
- * Dynamic Host Configuration Protocol client
- *
- */
-
-/*
- *
- * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
- * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
- * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * This file is a contribution to the lwIP TCP/IP stack.
- * The Swedish Institute of Computer Science and Adam Dunkels
- * are specifically granted permission to redistribute this
- * source code.
- *
- * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
- *
- * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
- * with RFC 2131 and RFC 2132.
- *
- * TODO:
- * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
- *
- * Please coordinate changes and requests with Leon Woestenberg
- * <leon.woestenberg@gmx.net>
- *
- * Integration with your code:
- *
- * In lwip/dhcp.h
- * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
- * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
- *
- * Then have your application call dhcp_coarse_tmr() and
- * dhcp_fine_tmr() on the defined intervals.
- *
- * dhcp_start(struct netif *netif);
- * starts a DHCP client instance which configures the interface by
- * obtaining an IP address lease and maintaining it.
- *
- * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
- * to remove the DHCP client.
- *
- */
-
-#include "lwip/opt.h"
-
-#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
-
-#include "lwip/stats.h"
-#include "lwip/mem.h"
-#include "lwip/udp.h"
-#include "lwip/ip_addr.h"
-#include "lwip/netif.h"
-#include "lwip/def.h"
-#include "lwip/sys.h"
-#include "lwip/dhcp.h"
-#include "lwip/autoip.h"
-#include "lwip/dns.h"
-#include "netif/etharp.h"
-
-#include <string.h>
-
-/** Default for DHCP_GLOBAL_XID is 0xABCD0000
- * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
- * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
- * #define DHCP_GLOBAL_XID rand()
- */
-#ifdef DHCP_GLOBAL_XID_HEADER
-#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
-#endif
-
-/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
- * MTU is checked to be big enough in dhcp_start */
-#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
-#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
-/** Minimum length for reply before packet is parsed */
-#define DHCP_MIN_REPLY_LEN 44
-
-#define REBOOT_TRIES 2
-
-/** Option handling: options are parsed in dhcp_parse_reply
- * and saved in an array where other functions can load them from.
- * This might be moved into the struct dhcp (not necessarily since
- * lwIP is single-threaded and the array is only used while in recv
- * callback). */
-#define DHCP_OPTION_IDX_OVERLOAD 0
-#define DHCP_OPTION_IDX_MSG_TYPE 1
-#define DHCP_OPTION_IDX_SERVER_ID 2
-#define DHCP_OPTION_IDX_LEASE_TIME 3
-#define DHCP_OPTION_IDX_T1 4
-#define DHCP_OPTION_IDX_T2 5
-#define DHCP_OPTION_IDX_SUBNET_MASK 6
-#define DHCP_OPTION_IDX_ROUTER 7
-#define DHCP_OPTION_IDX_DNS_SERVER 8
-#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
-
-/** Holds the decoded option values, only valid while in dhcp_recv.
- @todo: move this into struct dhcp? */
-u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
-/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
- only valid while in dhcp_recv.
- @todo: move this into struct dhcp? */
-u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
-
-#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
-#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
-#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
-#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
-#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
-#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
-
-
-/* DHCP client state machine functions */
-static err_t dhcp_discover(struct netif *netif);
-static err_t dhcp_select(struct netif *netif);
-static void dhcp_bind(struct netif *netif);
-#if DHCP_DOES_ARP_CHECK
-static err_t dhcp_decline(struct netif *netif);
-#endif /* DHCP_DOES_ARP_CHECK */
-static err_t dhcp_rebind(struct netif *netif);
-static err_t dhcp_reboot(struct netif *netif);
-static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
-
-/* receive, unfold, parse and free incoming messages */
-static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
-
-/* set the DHCP timers */
-static void dhcp_timeout(struct netif *netif);
-static void dhcp_t1_timeout(struct netif *netif);
-static void dhcp_t2_timeout(struct netif *netif);
-
-/* build outgoing messages */
-/* create a DHCP message, fill in common headers */
-static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
-/* free a DHCP request */
-static void dhcp_delete_msg(struct dhcp *dhcp);
-/* add a DHCP option (type, then length in bytes) */
-static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
-/* add option values */
-static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
-static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
-static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
-/* always add the DHCP options trailer to end and pad */
-static void dhcp_option_trailer(struct dhcp *dhcp);
-
-/**
- * Back-off the DHCP client (because of a received NAK response).
- *
- * Back-off the DHCP client because of a received NAK. Receiving a
- * NAK means the client asked for something non-sensible, for
- * example when it tries to renew a lease obtained on another network.
- *
- * We clear any existing set IP address and restart DHCP negotiation
- * afresh (as per RFC2131 3.2.3).
- *
- * @param netif the netif under DHCP control
- */
-static void
-dhcp_handle_nak(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
- (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
- /* Set the interface down since the address must no longer be used, as per RFC2131 */
- netif_set_down(netif);
- /* remove IP address from interface */
- netif_set_ipaddr(netif, IP_ADDR_ANY);
- netif_set_gw(netif, IP_ADDR_ANY);
- netif_set_netmask(netif, IP_ADDR_ANY);
- /* Change to a defined state */
- dhcp_set_state(dhcp, DHCP_BACKING_OFF);
- /* We can immediately restart discovery */
- dhcp_discover(netif);
-}
-
-#if DHCP_DOES_ARP_CHECK
-/**
- * Checks if the offered IP address is already in use.
- *
- * It does so by sending an ARP request for the offered address and
- * entering CHECKING state. If no ARP reply is received within a small
- * interval, the address is assumed to be free for use by us.
- *
- * @param netif the netif under DHCP control
- */
-static void
-dhcp_check(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result;
- u16_t msecs;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
- (s16_t)netif->name[1]));
- dhcp_set_state(dhcp, DHCP_CHECKING);
- /* create an ARP query for the offered IP address, expecting that no host
- responds, as the IP address should not be in use. */
- result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
- if (result != ERR_OK) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
- }
- dhcp->tries++;
- msecs = 500;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
-}
-#endif /* DHCP_DOES_ARP_CHECK */
-
-/**
- * Remember the configuration offered by a DHCP server.
- *
- * @param netif the netif under DHCP control
- */
-static void
-dhcp_handle_offer(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
- (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
- /* obtain the server address */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
- ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
- ip4_addr_get_u32(&dhcp->server_ip_addr)));
- /* remember offered address */
- ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
- ip4_addr_get_u32(&dhcp->offered_ip_addr)));
-
- dhcp_select(netif);
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
- ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
- }
-}
-
-/**
- * Select a DHCP server offer out of all offers.
- *
- * Simply select the first offer received.
- *
- * @param netif the netif under DHCP control
- * @return lwIP specific error (see error.h)
- */
-static err_t
-dhcp_select(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result;
- u16_t msecs;
-
- 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));
- dhcp_set_state(dhcp, DHCP_REQUESTING);
-
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
- if (result == ERR_OK) {
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
-
- /* MUST request the offered IP address */
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
-
- dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
-
- dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
- dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
- dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
- dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
- dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
-
-#if LWIP_NETIF_HOSTNAME
- if (netif->hostname != NULL) {
- const char *p = (const char*)netif->hostname;
- u8_t namelen = (u8_t)strlen(p);
- if (namelen > 0) {
- LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
- dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
- while (*p) {
- dhcp_option_byte(dhcp, *p++);
- }
- }
- }
-#endif /* LWIP_NETIF_HOSTNAME */
-
- dhcp_option_trailer(dhcp);
- /* shrink the pbuf to the actual content length */
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
-
- /* send broadcast to any DHCP server */
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
- dhcp_delete_msg(dhcp);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
- }
- dhcp->tries++;
- msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
- return result;
-}
-
-/**
- * The DHCP timer that checks for lease renewal/rebind timeouts.
- */
-void
-dhcp_coarse_tmr()
-{
- struct netif *netif = netif_list;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
- /* iterate through all network interfaces */
- while (netif != NULL) {
- /* only act on DHCP configured interfaces */
- if (netif->dhcp != NULL) {
- /* timer is active (non zero), and triggers (zeroes) now? */
- if (netif->dhcp->t2_timeout-- == 1) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
- /* this clients' rebind timeout triggered */
- dhcp_t2_timeout(netif);
- /* timer is active (non zero), and triggers (zeroes) now */
- } else if (netif->dhcp->t1_timeout-- == 1) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
- /* this clients' renewal timeout triggered */
- dhcp_t1_timeout(netif);
- }
- }
- /* proceed to next netif */
- netif = netif->next;
- }
-}
-
-/**
- * DHCP transaction timeout handling
- *
- * A DHCP server is expected to respond within a short period of time.
- * This timer checks whether an outstanding DHCP request is timed out.
- */
-void
-dhcp_fine_tmr()
-{
- struct netif *netif = netif_list;
- /* loop through netif's */
- while (netif != NULL) {
- /* only act on DHCP configured interfaces */
- if (netif->dhcp != NULL) {
- /* timer is active (non zero), and is about to trigger now */
- if (netif->dhcp->request_timeout > 1) {
- netif->dhcp->request_timeout--;
- }
- else if (netif->dhcp->request_timeout == 1) {
- netif->dhcp->request_timeout--;
- /* { netif->dhcp->request_timeout == 0 } */
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
- /* this client's request timeout triggered */
- dhcp_timeout(netif);
- }
- }
- /* proceed to next network interface */
- netif = netif->next;
- }
-}
-
-/**
- * A DHCP negotiation transaction, or ARP request, has timed out.
- *
- * The timer that was started with the DHCP or ARP request has
- * timed out, indicating no response was received in time.
- *
- * @param netif the netif under DHCP control
- */
-static void
-dhcp_timeout(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
- /* back-off period has passed, or server selection timed out */
- if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
- dhcp_discover(netif);
- /* receiving the requested lease timed out */
- } else if (dhcp->state == DHCP_REQUESTING) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
- if (dhcp->tries <= 5) {
- dhcp_select(netif);
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
- dhcp_release(netif);
- dhcp_discover(netif);
- }
-#if DHCP_DOES_ARP_CHECK
- /* received no ARP reply for the offered address (which is good) */
- } else if (dhcp->state == DHCP_CHECKING) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
- if (dhcp->tries <= 1) {
- dhcp_check(netif);
- /* no ARP replies on the offered address,
- looks like the IP address is indeed free */
- } else {
- /* bind the interface to the offered address */
- dhcp_bind(netif);
- }
-#endif /* DHCP_DOES_ARP_CHECK */
- }
- /* did not get response to renew request? */
- else if (dhcp->state == DHCP_RENEWING) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
- /* just retry renewal */
- /* note that the rebind timer will eventually time-out if renew does not work */
- dhcp_renew(netif);
- /* did not get response to rebind request? */
- } else if (dhcp->state == DHCP_REBINDING) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
- if (dhcp->tries <= 8) {
- dhcp_rebind(netif);
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
- dhcp_release(netif);
- dhcp_discover(netif);
- }
- } else if (dhcp->state == DHCP_REBOOTING) {
- if (dhcp->tries < REBOOT_TRIES) {
- dhcp_reboot(netif);
- } else {
- dhcp_discover(netif);
- }
- }
-}
-
-/**
- * The renewal period has timed out.
- *
- * @param netif the netif under DHCP control
- */
-static void
-dhcp_t1_timeout(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
- if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
- (dhcp->state == DHCP_RENEWING)) {
- /* just retry to renew - note that the rebind timer (t2) will
- * eventually time-out if renew tries fail. */
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
- ("dhcp_t1_timeout(): must renew\n"));
- /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
- DHCP_RENEWING, not DHCP_BOUND */
- dhcp_renew(netif);
- }
-}
-
-/**
- * The rebind period has timed out.
- *
- * @param netif the netif under DHCP control
- */
-static void
-dhcp_t2_timeout(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
- if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
- (dhcp->state == DHCP_RENEWING)) {
- /* just retry to rebind */
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
- ("dhcp_t2_timeout(): must rebind\n"));
- /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
- DHCP_REBINDING, not DHCP_BOUND */
- dhcp_rebind(netif);
- }
-}
-
-/**
- * Handle a DHCP ACK packet
- *
- * @param netif the netif under DHCP control
- */
-static void
-dhcp_handle_ack(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
-#if LWIP_DNS
- u8_t n;
-#endif /* LWIP_DNS */
-
- /* clear options we might not get from the ACK */
- ip_addr_set_zero(&dhcp->offered_sn_mask);
- ip_addr_set_zero(&dhcp->offered_gw_addr);
-#if LWIP_DHCP_BOOTP_FILE
- ip_addr_set_zero(&dhcp->offered_si_addr);
-#endif /* LWIP_DHCP_BOOTP_FILE */
-
- /* lease time given? */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
- /* remember offered lease time */
- dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
- }
- /* renewal period given? */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
- /* remember given renewal period */
- dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
- } else {
- /* calculate safe periods for renewal */
- dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
- }
-
- /* renewal period given? */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
- /* remember given rebind period */
- dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
- } else {
- /* calculate safe periods for rebinding */
- dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
- }
-
- /* (y)our internet address */
- ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
-
-#if LWIP_DHCP_BOOTP_FILE
- /* copy boot server address,
- boot file name copied in dhcp_parse_reply if not overloaded */
- ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
-#endif /* LWIP_DHCP_BOOTP_FILE */
-
- /* subnet mask given? */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
- /* remember given subnet mask */
- ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
- dhcp->subnet_mask_given = 1;
- } else {
- dhcp->subnet_mask_given = 0;
- }
-
- /* gateway router */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
- ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
- }
-
-#if LWIP_DNS
- /* DNS servers */
- n = 0;
- while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
- ip_addr_t dns_addr;
- ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
- dns_setserver(n, &dns_addr);
- n++;
- }
-#endif /* LWIP_DNS */
-}
-
-/** Set a statically allocated struct dhcp to work with.
- * Using this prevents dhcp_start to allocate it using mem_malloc.
- *
- * @param netif the netif for which to set the struct dhcp
- * @param dhcp (uninitialised) dhcp struct allocated by the application
- */
-void
-dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
-{
- LWIP_ASSERT("netif != NULL", netif != NULL);
- LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
- LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
-
- /* clear data structure */
- memset(dhcp, 0, sizeof(struct dhcp));
- /* dhcp_set_state(&dhcp, DHCP_OFF); */
- netif->dhcp = dhcp;
-}
-
-/**
- * Start DHCP negotiation for a network interface.
- *
- * If no DHCP client instance was attached to this interface,
- * a new client is created first. If a DHCP client instance
- * was already present, it restarts negotiation.
- *
- * @param netif The lwIP network interface
- * @return lwIP error code
- * - ERR_OK - No error
- * - ERR_MEM - Out of memory
- */
-err_t
-dhcp_start(struct netif *netif)
-{
- struct dhcp *dhcp;
- err_t result = ERR_OK;
-
- LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
- dhcp = netif->dhcp;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
- /* Remove the flag that says this netif is handled by DHCP,
- it is set when we succeeded starting. */
- netif->flags &= ~NETIF_FLAG_DHCP;
-
- /* check hwtype of the netif */
- if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
- return ERR_ARG;
- }
-
- /* check MTU of the netif */
- if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
- return ERR_MEM;
- }
-
- /* no DHCP client attached yet? */
- if (dhcp == NULL) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
- dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
- if (dhcp == NULL) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
- return ERR_MEM;
- }
- /* store this dhcp client in the netif */
- netif->dhcp = dhcp;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
- /* already has DHCP client attached */
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
- if (dhcp->pcb != NULL) {
- udp_remove(dhcp->pcb);
- }
- LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
- LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
- }
-
- /* clear data structure */
- memset(dhcp, 0, sizeof(struct dhcp));
- /* dhcp_set_state(&dhcp, DHCP_OFF); */
- /* allocate UDP PCB */
- dhcp->pcb = udp_new();
- if (dhcp->pcb == NULL) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
- return ERR_MEM;
- }
- dhcp->pcb->so_options |= SOF_BROADCAST;
- /* set up local and remote port for the pcb */
- udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
- udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
- /* set up the recv callback and argument */
- udp_recv(dhcp->pcb, dhcp_recv, netif);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
- /* (re)start the DHCP negotiation */
- result = dhcp_discover(netif);
- if (result != ERR_OK) {
- /* free resources allocated above */
- dhcp_stop(netif);
- return ERR_MEM;
- }
- /* Set the flag that says this netif is handled by DHCP. */
- netif->flags |= NETIF_FLAG_DHCP;
- return result;
-}
-
-/**
- * Inform a DHCP server of our manual configuration.
- *
- * This informs DHCP servers of our fixed IP address configuration
- * by sending an INFORM message. It does not involve DHCP address
- * configuration, it is just here to be nice to the network.
- *
- * @param netif The lwIP network interface
- */
-void
-dhcp_inform(struct netif *netif)
-{
- struct dhcp dhcp;
- err_t result = ERR_OK;
- struct udp_pcb *pcb;
-
- LWIP_ERROR("netif != NULL", (netif != NULL), return;);
-
- memset(&dhcp, 0, sizeof(struct dhcp));
- dhcp_set_state(&dhcp, DHCP_INFORM);
-
- if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
- /* re-use existing pcb */
- pcb = netif->dhcp->pcb;
- } else {
- pcb = udp_new();
- if (pcb == NULL) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
- return;
- }
- dhcp.pcb = pcb;
- dhcp.pcb->so_options |= SOF_BROADCAST;
- udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
- }
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
- if (result == ERR_OK) {
- dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
- dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
-
- dhcp_option_trailer(&dhcp);
-
- pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
-
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
- udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
- dhcp_delete_msg(&dhcp);
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
- }
-
- if (dhcp.pcb != NULL) {
- /* otherwise, the existing pcb was used */
- udp_remove(dhcp.pcb);
- }
-}
-
-/** Handle a possible change in the network configuration.
- *
- * This enters the REBOOTING state to verify that the currently bound
- * address is still valid.
- */
-void
-dhcp_network_changed(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- if (!dhcp)
- return;
- switch (dhcp->state) {
- case DHCP_REBINDING:
- case DHCP_RENEWING:
- case DHCP_BOUND:
- case DHCP_REBOOTING:
- netif_set_down(netif);
- dhcp->tries = 0;
- dhcp_reboot(netif);
- break;
- case DHCP_OFF:
- /* stay off */
- break;
- default:
- dhcp->tries = 0;
-#if LWIP_DHCP_AUTOIP_COOP
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
-#endif /* LWIP_DHCP_AUTOIP_COOP */
- dhcp_discover(netif);
- break;
- }
-}
-
-#if DHCP_DOES_ARP_CHECK
-/**
- * Match an ARP reply with the offered IP address.
- *
- * @param netif the network interface on which the reply was received
- * @param addr The IP address we received a reply from
- */
-void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
-{
- LWIP_ERROR("netif != NULL", (netif != NULL), return;);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
- /* is a DHCP client doing an ARP check? */
- if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
- ip4_addr_get_u32(addr)));
- /* did a host respond with the address we
- were offered by the DHCP server? */
- if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
- /* we will not accept the offered address */
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
- ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
- dhcp_decline(netif);
- }
- }
-}
-
-/**
- * Decline an offered lease.
- *
- * Tell the DHCP server we do not accept the offered address.
- * One reason to decline the lease is when we find out the address
- * is already in use by another host (through ARP).
- *
- * @param netif the netif under DHCP control
- */
-static err_t
-dhcp_decline(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result = ERR_OK;
- u16_t msecs;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
- dhcp_set_state(dhcp, DHCP_BACKING_OFF);
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
- if (result == ERR_OK) {
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
-
- dhcp_option_trailer(dhcp);
- /* resize pbuf to reflect true size of options */
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
-
- /* per section 4.4.4, broadcast DECLINE messages */
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
- dhcp_delete_msg(dhcp);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
- ("dhcp_decline: could not allocate DHCP request\n"));
- }
- dhcp->tries++;
- msecs = 10*1000;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
- return result;
-}
-#endif /* DHCP_DOES_ARP_CHECK */
-
-
-/**
- * Start the DHCP process, discover a DHCP server.
- *
- * @param netif the netif under DHCP control
- */
-static err_t
-dhcp_discover(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result = ERR_OK;
- u16_t msecs;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
- ip_addr_set_any(&dhcp->offered_ip_addr);
- dhcp_set_state(dhcp, DHCP_SELECTING);
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
- if (result == ERR_OK) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
-
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
-
- dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
- dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
- dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
- dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
- dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
-
- dhcp_option_trailer(dhcp);
-
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
-
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
- dhcp_delete_msg(dhcp);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
- }
- dhcp->tries++;
-#if LWIP_DHCP_AUTOIP_COOP
- if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
- autoip_start(netif);
- }
-#endif /* LWIP_DHCP_AUTOIP_COOP */
- msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
- return result;
-}
-
-
-/**
- * Bind the interface to the offered IP address.
- *
- * @param netif network interface to bind to the offered address
- */
-static void
-dhcp_bind(struct netif *netif)
-{
- u32_t timeout;
- struct dhcp *dhcp;
- ip_addr_t sn_mask, gw_addr;
- LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
- dhcp = netif->dhcp;
- LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
-
- /* temporary DHCP lease? */
- if (dhcp->offered_t1_renew != 0xffffffffUL) {
- /* set renewal period timer */
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
- timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
- if(timeout > 0xffff) {
- timeout = 0xffff;
- }
- dhcp->t1_timeout = (u16_t)timeout;
- if (dhcp->t1_timeout == 0) {
- dhcp->t1_timeout = 1;
- }
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
- }
- /* set renewal period timer */
- if (dhcp->offered_t2_rebind != 0xffffffffUL) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
- timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
- if(timeout > 0xffff) {
- timeout = 0xffff;
- }
- dhcp->t2_timeout = (u16_t)timeout;
- if (dhcp->t2_timeout == 0) {
- dhcp->t2_timeout = 1;
- }
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
- }
-
- if (dhcp->subnet_mask_given) {
- /* copy offered network mask */
- ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
- } else {
- /* subnet mask not given, choose a safe subnet mask given the network class */
- u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
- if (first_octet <= 127) {
- ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
- } else if (first_octet >= 192) {
- ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
- } else {
- ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
- }
- }
-
- ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
- /* gateway address not given? */
- if (ip_addr_isany(&gw_addr)) {
- /* copy network address */
- ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
- /* use first host address on network as gateway */
- ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001));
- }
-
-#if LWIP_DHCP_AUTOIP_COOP
- if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
- autoip_stop(netif);
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
- }
-#endif /* LWIP_DHCP_AUTOIP_COOP */
-
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
- ip4_addr_get_u32(&dhcp->offered_ip_addr)));
- netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
- ip4_addr_get_u32(&sn_mask)));
- netif_set_netmask(netif, &sn_mask);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
- ip4_addr_get_u32(&gw_addr)));
- netif_set_gw(netif, &gw_addr);
- /* bring the interface up */
- netif_set_up(netif);
- /* netif is now bound to DHCP leased address */
- dhcp_set_state(dhcp, DHCP_BOUND);
-}
-
-/**
- * Renew an existing DHCP lease at the involved DHCP server.
- *
- * @param netif network interface which must renew its lease
- */
-err_t
-dhcp_renew(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result;
- u16_t msecs;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
- dhcp_set_state(dhcp, DHCP_RENEWING);
-
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
- if (result == ERR_OK) {
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
-
-#if LWIP_NETIF_HOSTNAME
- if (netif->hostname != NULL) {
- const char *p = (const char*)netif->hostname;
- u8_t namelen = (u8_t)strlen(p);
- if (namelen > 0) {
- LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
- dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
- while (*p) {
- dhcp_option_byte(dhcp, *p++);
- }
- }
- }
-#endif /* LWIP_NETIF_HOSTNAME */
-
-#if 0
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
- dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
-#endif
-
-#if 0
- dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
- dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
-#endif
- /* append DHCP message trailer */
- dhcp_option_trailer(dhcp);
-
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
-
- udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
- dhcp_delete_msg(dhcp);
-
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
- }
- dhcp->tries++;
- /* back-off on retries, but to a maximum of 20 seconds */
- msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
- return result;
-}
-
-/**
- * Rebind with a DHCP server for an existing DHCP lease.
- *
- * @param netif network interface which must rebind with a DHCP server
- */
-static err_t
-dhcp_rebind(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result;
- u16_t msecs;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
- dhcp_set_state(dhcp, DHCP_REBINDING);
-
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
- if (result == ERR_OK) {
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
- dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
-
-#if LWIP_NETIF_HOSTNAME
- if (netif->hostname != NULL) {
- const char *p = (const char*)netif->hostname;
- u8_t namelen = (u8_t)strlen(p);
- if (namelen > 0) {
- LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
- dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
- while (*p) {
- dhcp_option_byte(dhcp, *p++);
- }
- }
- }
-#endif /* LWIP_NETIF_HOSTNAME */
-
-#if 0
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
- dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
-
- dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
- dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
-#endif
-
- dhcp_option_trailer(dhcp);
-
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
-
- /* broadcast to server */
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
- dhcp_delete_msg(dhcp);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
- }
- dhcp->tries++;
- msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
- return result;
-}
-
-/**
- * Enter REBOOTING state to verify an existing lease
- *
- * @param netif network interface which must reboot
- */
-static err_t
-dhcp_reboot(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result;
- u16_t msecs;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
- dhcp_set_state(dhcp, DHCP_REBOOTING);
-
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
- if (result == ERR_OK) {
- dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
- dhcp_option_short(dhcp, 576);
-
- dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
- dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
-
- dhcp_option_trailer(dhcp);
-
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
-
- /* broadcast to server */
- udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
- dhcp_delete_msg(dhcp);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
- }
- dhcp->tries++;
- msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
- return result;
-}
-
-
-/**
- * Release a DHCP lease.
- *
- * @param netif network interface which must release its lease
- */
-err_t
-dhcp_release(struct netif *netif)
-{
- struct dhcp *dhcp = netif->dhcp;
- err_t result;
- u16_t msecs;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
-
- /* idle DHCP client */
- dhcp_set_state(dhcp, DHCP_OFF);
- /* clean old DHCP offer */
- ip_addr_set_zero(&dhcp->server_ip_addr);
- ip_addr_set_zero(&dhcp->offered_ip_addr);
- ip_addr_set_zero(&dhcp->offered_sn_mask);
- ip_addr_set_zero(&dhcp->offered_gw_addr);
-#if LWIP_DHCP_BOOTP_FILE
- ip_addr_set_zero(&dhcp->offered_si_addr);
-#endif /* LWIP_DHCP_BOOTP_FILE */
- dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
-
- /* create and initialize the DHCP message header */
- result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
- if (result == ERR_OK) {
- dhcp_option_trailer(dhcp);
-
- pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
-
- udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
- dhcp_delete_msg(dhcp);
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
- }
- dhcp->tries++;
- msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
- dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
- /* bring the interface down */
- netif_set_down(netif);
- /* remove IP address from interface */
- netif_set_ipaddr(netif, IP_ADDR_ANY);
- netif_set_gw(netif, IP_ADDR_ANY);
- netif_set_netmask(netif, IP_ADDR_ANY);
-
- return result;
-}
-
-/**
- * Remove the DHCP client from the interface.
- *
- * @param netif The network interface to stop DHCP on
- */
-void
-dhcp_stop(struct netif *netif)
-{
- struct dhcp *dhcp;
- LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
- dhcp = netif->dhcp;
- /* Remove the flag that says this netif is handled by DHCP. */
- netif->flags &= ~NETIF_FLAG_DHCP;
-
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
- /* netif is DHCP configured? */
- if (dhcp != NULL) {
-#if LWIP_DHCP_AUTOIP_COOP
- if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
- autoip_stop(netif);
- dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
- }
-#endif /* LWIP_DHCP_AUTOIP_COOP */
-
- if (dhcp->pcb != NULL) {
- udp_remove(dhcp->pcb);
- dhcp->pcb = NULL;
- }
- LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
- dhcp_set_state(dhcp, DHCP_OFF);
- }
-}
-
-/*
- * Set the DHCP state of a DHCP client.
- *
- * If the state changed, reset the number of tries.
- */
-static void
-dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
-{
- if (new_state != dhcp->state) {
- dhcp->state = new_state;
- dhcp->tries = 0;
- dhcp->request_timeout = 0;
- }
-}
-
-/*
- * Concatenate an option type and length field to the outgoing
- * DHCP message.
- *
- */
-static void
-dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
-{
- LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
- dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
- dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
-}
-/*
- * Concatenate a single byte to the outgoing DHCP message.
- *
- */
-static void
-dhcp_option_byte(struct dhcp *dhcp, u8_t value)
-{
- LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
- dhcp->msg_out->options[dhcp->options_out_len++] = value;
-}
-
-static void
-dhcp_option_short(struct dhcp *dhcp, u16_t value)
-{
- LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
-}
-
-static void
-dhcp_option_long(struct dhcp *dhcp, u32_t value)
-{
- LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
- dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
-}
-
-/**
- * Extract the DHCP message and the DHCP options.
- *
- * Extract the DHCP message and the DHCP options, each into a contiguous
- * piece of memory. As a DHCP message is variable sized by its options,
- * and also allows overriding some fields for options, the easy approach
- * is to first unfold the options into a conitguous piece of memory, and
- * use that further on.
- *
- */
-static err_t
-dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
-{
- u8_t *options;
- u16_t offset;
- u16_t offset_max;
- u16_t options_idx;
- u16_t options_idx_max;
- struct pbuf *q;
- int parse_file_as_options = 0;
- int parse_sname_as_options = 0;
-
- /* clear received options */
- dhcp_clear_all_options(dhcp);
- /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
- if (p->len < DHCP_SNAME_OFS) {
- return ERR_BUF;
- }
- dhcp->msg_in = (struct dhcp_msg *)p->payload;
-#if LWIP_DHCP_BOOTP_FILE
- /* clear boot file name */
- dhcp->boot_file_name[0] = 0;
-#endif /* LWIP_DHCP_BOOTP_FILE */
-
- /* parse options */
-
- /* start with options field */
- options_idx = DHCP_OPTIONS_OFS;
- /* parse options to the end of the received packet */
- options_idx_max = p->tot_len;
-again:
- q = p;
- while((q != NULL) && (options_idx >= q->len)) {
- options_idx -= q->len;
- options_idx_max -= q->len;
- q = q->next;
- }
- if (q == NULL) {
- return ERR_BUF;
- }
- offset = options_idx;
- offset_max = options_idx_max;
- options = (u8_t*)q->payload;
- /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
- while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
- u8_t op = options[offset];
- u8_t len;
- u8_t decode_len = 0;
- int decode_idx = -1;
- u16_t val_offset = offset + 2;
- /* len byte might be in the next pbuf */
- if (offset + 1 < q->len) {
- len = options[offset + 1];
- } else {
- len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
- }
- /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
- decode_len = len;
- switch(op) {
- /* case(DHCP_OPTION_END): handled above */
- case(DHCP_OPTION_PAD):
- /* special option: no len encoded */
- decode_len = len = 0;
- /* will be increased below */
- offset--;
- break;
- case(DHCP_OPTION_SUBNET_MASK):
- LWIP_ASSERT("len == 4", len == 4);
- decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
- break;
- case(DHCP_OPTION_ROUTER):
- decode_len = 4; /* only copy the first given router */
- LWIP_ASSERT("len >= decode_len", len >= decode_len);
- decode_idx = DHCP_OPTION_IDX_ROUTER;
- break;
- case(DHCP_OPTION_DNS_SERVER):
- /* special case: there might be more than one server */
- LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
- /* limit number of DNS servers */
- decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
- LWIP_ASSERT("len >= decode_len", len >= decode_len);
- decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
- break;
- case(DHCP_OPTION_LEASE_TIME):
- LWIP_ASSERT("len == 4", len == 4);
- decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
- break;
- case(DHCP_OPTION_OVERLOAD):
- LWIP_ASSERT("len == 1", len == 1);
- decode_idx = DHCP_OPTION_IDX_OVERLOAD;
- break;
- case(DHCP_OPTION_MESSAGE_TYPE):
- LWIP_ASSERT("len == 1", len == 1);
- decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
- break;
- case(DHCP_OPTION_SERVER_ID):
- LWIP_ASSERT("len == 4", len == 4);
- decode_idx = DHCP_OPTION_IDX_SERVER_ID;
- break;
- case(DHCP_OPTION_T1):
- LWIP_ASSERT("len == 4", len == 4);
- decode_idx = DHCP_OPTION_IDX_T1;
- break;
- case(DHCP_OPTION_T2):
- LWIP_ASSERT("len == 4", len == 4);
- decode_idx = DHCP_OPTION_IDX_T2;
- break;
- default:
- decode_len = 0;
- LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
- break;
- }
- offset += len + 2;
- if (decode_len > 0) {
- u32_t value = 0;
- u16_t copy_len;
-decode_next:
- LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
- LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
- copy_len = LWIP_MIN(decode_len, 4);
- pbuf_copy_partial(q, &value, copy_len, val_offset);
- if (decode_len > 4) {
- /* decode more than one u32_t */
- LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
- dhcp_got_option(dhcp, decode_idx);
- dhcp_set_option_value(dhcp, decode_idx, htonl(value));
- decode_len -= 4;
- val_offset += 4;
- decode_idx++;
- goto decode_next;
- } else if (decode_len == 4) {
- value = ntohl(value);
- } else {
- LWIP_ASSERT("invalid decode_len", decode_len == 1);
- value = ((u8_t*)&value)[0];
- }
- dhcp_got_option(dhcp, decode_idx);
- dhcp_set_option_value(dhcp, decode_idx, value);
- }
- if (offset >= q->len) {
- offset -= q->len;
- offset_max -= q->len;
- q = q->next;
- options = (u8_t*)q->payload;
- }
- }
- /* is this an overloaded message? */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
- u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
- dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
- if (overload == DHCP_OVERLOAD_FILE) {
- parse_file_as_options = 1;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
- } else if (overload == DHCP_OVERLOAD_SNAME) {
- parse_sname_as_options = 1;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
- } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
- parse_sname_as_options = 1;
- parse_file_as_options = 1;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
- } else {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
- }
-#if LWIP_DHCP_BOOTP_FILE
- if (!parse_file_as_options) {
- /* only do this for ACK messages */
- if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
- (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
- /* copy bootp file name, don't care for sname (server hostname) */
- pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
- /* make sure the string is really NULL-terminated */
- dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
- }
-#endif /* LWIP_DHCP_BOOTP_FILE */
- }
- if (parse_file_as_options) {
- /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
- parse_file_as_options = 0;
- options_idx = DHCP_FILE_OFS;
- options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
- goto again;
- } else if (parse_sname_as_options) {
- parse_sname_as_options = 0;
- options_idx = DHCP_SNAME_OFS;
- options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
- goto again;
- }
- return ERR_OK;
-}
-
-/**
- * If an incoming DHCP message is in response to us, then trigger the state machine
- */
-static void
-dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
-{
- struct netif *netif = (struct netif *)arg;
- struct dhcp *dhcp = netif->dhcp;
- struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
- u8_t msg_type;
- u8_t i;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
- ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
- /* prevent warnings about unused arguments */
- LWIP_UNUSED_ARG(pcb);
- LWIP_UNUSED_ARG(addr);
- LWIP_UNUSED_ARG(port);
-
- LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
-
- if (p->len < DHCP_MIN_REPLY_LEN) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
- goto free_pbuf_and_return;
- }
-
- if (reply_msg->op != DHCP_BOOTREPLY) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
- goto free_pbuf_and_return;
- }
- /* iterate through hardware address and match against DHCP message */
- for (i = 0; i < netif->hwaddr_len; i++) {
- if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
- ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
- (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
- goto free_pbuf_and_return;
- }
- }
- /* match transaction ID against what we expected */
- if (ntohl(reply_msg->xid) != dhcp->xid) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
- ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
- goto free_pbuf_and_return;
- }
- /* option fields could be unfold? */
- if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
- ("problem unfolding DHCP message - too short on memory?\n"));
- goto free_pbuf_and_return;
- }
-
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
- /* obtain pointer to DHCP message type */
- if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
- goto free_pbuf_and_return;
- }
-
- /* read DHCP message type */
- msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
- /* message type is DHCP ACK? */
- if (msg_type == DHCP_ACK) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
- /* in requesting state? */
- if (dhcp->state == DHCP_REQUESTING) {
- dhcp_handle_ack(netif);
-#if DHCP_DOES_ARP_CHECK
- /* check if the acknowledged lease address is already in use */
- dhcp_check(netif);
-#else
- /* bind interface to the acknowledged lease address */
- dhcp_bind(netif);
-#endif
- }
- /* already bound to the given lease address? */
- else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
- dhcp_bind(netif);
- }
- }
- /* received a DHCP_NAK in appropriate state? */
- else if ((msg_type == DHCP_NAK) &&
- ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
- (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
- dhcp_handle_nak(netif);
- }
- /* received a DHCP_OFFER in DHCP_SELECTING state? */
- else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
- dhcp->request_timeout = 0;
- /* remember offered lease */
- dhcp_handle_offer(netif);
- }
-free_pbuf_and_return:
- dhcp->msg_in = NULL;
- pbuf_free(p);
-}
-
-/**
- * Create a DHCP request, fill in common headers
- *
- * @param netif the netif under DHCP control
- * @param dhcp dhcp control struct
- * @param message_type message type of the request
- */
-static err_t
-dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
-{
- u16_t i;
-#ifndef DHCP_GLOBAL_XID
- /** default global transaction identifier starting value (easy to match
- * with a packet analyser). We simply increment for each new request.
- * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
- * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
- static u32_t xid = 0xABCD0000;
-#else
- static u32_t xid;
- static u8_t xid_initialised = 0;
- if (!xid_initialised) {
- xid = DHCP_GLOBAL_XID;
- xid_initialised = !xid_initialised;
- }
-#endif
- LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
- LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
- LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
- LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
- dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
- if (dhcp->p_out == NULL) {
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
- ("dhcp_create_msg(): could not allocate pbuf\n"));
- return ERR_MEM;
- }
- LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
- (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
-
- /* reuse transaction identifier in retransmissions */
- if (dhcp->tries == 0) {
- xid++;
- }
- dhcp->xid = xid;
- LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
- ("transaction id xid(%"X32_F")\n", xid));
-
- dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
-
- dhcp->msg_out->op = DHCP_BOOTREQUEST;
- /* TODO: make link layer independent */
- dhcp->msg_out->htype = DHCP_HTYPE_ETH;
- dhcp->msg_out->hlen = netif->hwaddr_len;
- dhcp->msg_out->hops = 0;
- dhcp->msg_out->xid = htonl(dhcp->xid);
- dhcp->msg_out->secs = 0;
- /* we don't need the broadcast flag since we can receive unicast traffic
- before being fully configured! */
- dhcp->msg_out->flags = 0;
- ip_addr_set_zero(&dhcp->msg_out->ciaddr);
- /* set ciaddr to netif->ip_addr based on message_type and state */
- if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
- ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
- ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
- ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
- }
- ip_addr_set_zero(&dhcp->msg_out->yiaddr);
- ip_addr_set_zero(&dhcp->msg_out->siaddr);
- ip_addr_set_zero(&dhcp->msg_out->giaddr);
- for (i = 0; i < DHCP_CHADDR_LEN; i++) {
- /* copy netif hardware address, pad with zeroes */
- dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
- }
- for (i = 0; i < DHCP_SNAME_LEN; i++) {
- dhcp->msg_out->sname[i] = 0;
- }
- for (i = 0; i < DHCP_FILE_LEN; i++) {
- dhcp->msg_out->file[i] = 0;
- }
- dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
- dhcp->options_out_len = 0;
- /* fill options field with an incrementing array (for debugging purposes) */
- for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
- dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
- }
- /* Add option MESSAGE_TYPE */
- dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
- dhcp_option_byte(dhcp, message_type);
- return ERR_OK;
-}
-
-/**
- * Free previously allocated memory used to send a DHCP request.
- *
- * @param dhcp the dhcp struct to free the request from
- */
-static void
-dhcp_delete_msg(struct dhcp *dhcp)
-{
- LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
- LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
- LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
- if (dhcp->p_out != NULL) {
- pbuf_free(dhcp->p_out);
- }
- dhcp->p_out = NULL;
- dhcp->msg_out = NULL;
-}
-
-/**
- * Add a DHCP message trailer
- *
- * Adds the END option to the DHCP message, and if
- * necessary, up to three padding bytes.
- *
- * @param dhcp DHCP state structure
- */
-static void
-dhcp_option_trailer(struct dhcp *dhcp)
-{
- LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
- LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
- LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
- dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
- /* packet is too small, or not 4 byte aligned? */
- while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
- /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
- LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
- /* add a fill/padding byte */
- dhcp->msg_out->options[dhcp->options_out_len++] = 0;
- }
-}
-
-#endif /* LWIP_DHCP */