1829 lines
66 KiB
C
1829 lines
66 KiB
C
/**
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* @file
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* Dynamic Host Configuration Protocol client
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*
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*/
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/*
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*
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* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
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* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is a contribution to the lwIP TCP/IP stack.
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* The Swedish Institute of Computer Science and Adam Dunkels
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* are specifically granted permission to redistribute this
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* source code.
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*
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* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
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*
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* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
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* with RFC 2131 and RFC 2132.
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*
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* TODO:
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* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
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*
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* Please coordinate changes and requests with Leon Woestenberg
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* <leon.woestenberg@gmx.net>
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*
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* Integration with your code:
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*
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* In lwip/dhcp.h
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* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
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* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
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*
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* Then have your application call dhcp_coarse_tmr() and
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* dhcp_fine_tmr() on the defined intervals.
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*
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* dhcp_start(struct netif *netif);
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* starts a DHCP client instance which configures the interface by
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* obtaining an IP address lease and maintaining it.
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*
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* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
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* to remove the DHCP client.
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/stats.h"
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#include "lwip/mem.h"
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#include "lwip/udp.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/def.h"
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#include "lwip/sys.h"
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#include "lwip/dhcp.h"
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#include "lwip/autoip.h"
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#include "lwip/dns.h"
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#include "netif/etharp.h"
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#include <string.h>
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#ifdef MEMLEAK_DEBUG
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static const char mem_debug_file[] ICACHE_RODATA_ATTR = __FILE__;
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#endif
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/** Default for DHCP_GLOBAL_XID is 0xABCD0000
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* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
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* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
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* #define DHCP_GLOBAL_XID rand()
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*/
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#ifdef DHCP_GLOBAL_XID_HEADER
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#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
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#endif
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/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
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* MTU is checked to be big enough in dhcp_start */
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#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
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#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
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/** Minimum length for reply before packet is parsed */
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#define DHCP_MIN_REPLY_LEN 44
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#define REBOOT_TRIES 2
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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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* lwIP is single-threaded and the array is only used while in recv
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* callback). */
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#define DHCP_OPTION_IDX_OVERLOAD 0
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#define DHCP_OPTION_IDX_MSG_TYPE 1
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#define DHCP_OPTION_IDX_SERVER_ID 2
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#define DHCP_OPTION_IDX_LEASE_TIME 3
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#define DHCP_OPTION_IDX_T1 4
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#define DHCP_OPTION_IDX_T2 5
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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_NTP 8
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#define DHCP_OPTION_IDX_DNS_SERVER 9
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#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
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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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u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
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/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
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only valid while in dhcp_recv.
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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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#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
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#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
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#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
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#define dhcp_clear_all_options(dhcp) (os_memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
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#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
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#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
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/* DHCP client state machine functions */
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static err_t dhcp_discover(struct netif *netif);
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static err_t dhcp_select(struct netif *netif);
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static void dhcp_bind(struct netif *netif);
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#if DHCP_DOES_ARP_CHECK
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static err_t dhcp_decline(struct netif *netif);
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#endif /* DHCP_DOES_ARP_CHECK */
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static err_t dhcp_rebind(struct netif *netif);
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static err_t dhcp_reboot(struct netif *netif);
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static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
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/* receive, unfold, parse and free incoming messages */
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static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
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/* set the DHCP timers */
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static void dhcp_timeout(struct netif *netif);
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static void dhcp_t1_timeout(struct netif *netif);
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static void dhcp_t2_timeout(struct netif *netif);
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/* build outgoing messages */
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/* create a DHCP message, fill in common headers */
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static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
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/* free a DHCP request */
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static void dhcp_delete_msg(struct dhcp *dhcp);
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/* add a DHCP option (type, then length in bytes) */
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static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
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/* add option values */
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static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
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static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
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static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
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/* always add the DHCP options trailer to end and pad */
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static void dhcp_option_trailer(struct dhcp *dhcp);
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/**
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* Back-off the DHCP client (because of a received NAK response).
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*
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* Back-off the DHCP client because of a received NAK. Receiving a
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* NAK means the client asked for something non-sensible, for
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* example when it tries to renew a lease obtained on another network.
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*
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* We clear any existing set IP address and restart DHCP negotiation
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* afresh (as per RFC2131 3.2.3).
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*
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* @param netif the netif under DHCP control
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*/
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static void ICACHE_FLASH_ATTR
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dhcp_handle_nak(struct netif *netif)
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{
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struct dhcp *dhcp = netif->dhcp;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
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(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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/* Set the interface down since the address must no longer be used, as per RFC2131 */
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netif_set_down(netif);
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/* remove IP address from interface */
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netif_set_ipaddr(netif, IP_ADDR_ANY);
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netif_set_gw(netif, IP_ADDR_ANY);
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netif_set_netmask(netif, IP_ADDR_ANY);
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/* Change to a defined state */
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dhcp_set_state(dhcp, DHCP_BACKING_OFF);
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/* We can immediately restart discovery */
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dhcp_discover(netif);
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}
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#if DHCP_DOES_ARP_CHECK
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/**
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* Checks if the offered IP address is already in use.
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*
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* It does so by sending an ARP request for the offered address and
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* entering CHECKING state. If no ARP reply is received within a small
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* interval, the address is assumed to be free for use by us.
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*
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* @param netif the netif under DHCP control
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*/
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static void ICACHE_FLASH_ATTR
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dhcp_check(struct netif *netif)
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{
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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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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
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(s16_t)netif->name[1]));
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dhcp_set_state(dhcp, DHCP_CHECKING);
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/* create an ARP query for the offered IP address, expecting that no host
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responds, as the IP address should not be in use. */
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result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
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if (result != ERR_OK) {
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
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}
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dhcp->tries++;
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msecs = 500;
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dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
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}
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#endif /* DHCP_DOES_ARP_CHECK */
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/**
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* Remember the configuration offered by a DHCP server.
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*
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* @param netif the netif under DHCP control
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*/
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static void ICACHE_FLASH_ATTR
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dhcp_handle_offer(struct netif *netif)
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{
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struct dhcp *dhcp = netif->dhcp;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
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(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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/* obtain the server address */
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if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
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ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
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ip4_addr_get_u32(&dhcp->server_ip_addr)));
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/* remember offered address */
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ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
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ip4_addr_get_u32(&dhcp->offered_ip_addr)));
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dhcp_select(netif);
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} else {
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
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("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
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}
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}
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/**
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* Select a DHCP server offer out of all offers.
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*
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* Simply select the first offer received.
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*
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* @param netif the netif under DHCP control
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* @return lwIP specific error (see error.h)
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*/
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static err_t ICACHE_FLASH_ATTR
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dhcp_select(struct netif *netif)
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{
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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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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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/* create and initialize the DHCP message header */
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result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
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if (result == ERR_OK) {
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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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/* MUST request the offered IP address */
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dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
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dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
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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, 13/*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_byte(dhcp, DHCP_OPTION_NTP);
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dhcp_option_byte(dhcp, DHCP_OPTION_DOMAIN_NAME);
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dhcp_option_byte(dhcp, DHCP_OPTION_NB_TINS);
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dhcp_option_byte(dhcp, DHCP_OPTION_NB_TINT);
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dhcp_option_byte(dhcp, DHCP_OPTION_NB_TIS);
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dhcp_option_byte(dhcp, DHCP_OPTION_PRD);
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dhcp_option_byte(dhcp, DHCP_OPTION_STATIC_ROUTER);
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dhcp_option_byte(dhcp, DHCP_OPTION_CLASSLESS_STATIC_ROUTER);
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dhcp_option_byte(dhcp, DHCP_OPTION_VSN);
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#if LWIP_NETIF_HOSTNAME
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if (netif->hostname != NULL) {
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const char *p = (const char*)netif->hostname;
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u8_t namelen = (u8_t)os_strlen(p);
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if (namelen > 0) {
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LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
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dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
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while (*p) {
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dhcp_option_byte(dhcp, *p++);
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}
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}
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}
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#endif /* LWIP_NETIF_HOSTNAME */
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dhcp_option_trailer(dhcp);
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/* shrink the pbuf to the actual content length */
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pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
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/* send broadcast to any DHCP server */
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udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
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dhcp_delete_msg(dhcp);
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
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} else {
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
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}
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dhcp->tries++;
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msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
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dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
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return result;
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}
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/**
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* The DHCP timer that checks for lease renewal/rebind timeouts.
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*/
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void ICACHE_FLASH_ATTR
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dhcp_coarse_tmr()
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{
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struct netif *netif = netif_list;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
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/* iterate through all network interfaces */
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while (netif != NULL) {
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/* only act on DHCP configured interfaces */
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if (netif->dhcp != NULL) {
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/* timer is active (non zero), and triggers (zeroes) now? */
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if (netif->dhcp->t2_timeout-- == 1) {
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
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/* this clients' rebind timeout triggered */
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dhcp_t2_timeout(netif);
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/* timer is active (non zero), and triggers (zeroes) now */
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} else if (netif->dhcp->t1_timeout-- == 1) {
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
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/* this clients' renewal timeout triggered */
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dhcp_t1_timeout(netif);
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}
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}
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/* proceed to next netif */
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netif = netif->next;
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}
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}
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/**
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* DHCP transaction timeout handling
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*
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* A DHCP server is expected to respond within a short period of time.
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* This timer checks whether an outstanding DHCP request is timed out.
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*/
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void ICACHE_FLASH_ATTR
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dhcp_fine_tmr()
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{
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struct netif *netif = netif_list;
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/* loop through netif's */
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while (netif != NULL) {
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/* only act on DHCP configured interfaces */
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if (netif->dhcp != NULL) {
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/*add DHCP retries processing by LiuHan*/
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if (DHCP_MAXRTX != 0) {
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if (netif->dhcp->tries >= DHCP_MAXRTX){
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os_printf("DHCP timeout\n");
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if (netif->dhcp_event != NULL)
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netif->dhcp_event();
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break;
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}
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}
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/* timer is active (non zero), and is about to trigger now */
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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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 */
|
|
ip_addr_set_zero(&dhcp->offered_ntp_addr);
|
|
|
|
/* 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 */
|
|
|
|
if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_NTP)) {
|
|
ip4_addr_set_u32(&dhcp->offered_ntp_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_NTP)));
|
|
}
|
|
}
|
|
|
|
/** 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 ICACHE_FLASH_ATTR
|
|
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 */
|
|
os_memset(dhcp, 0, sizeof(struct dhcp));
|
|
/* dhcp_set_state(&dhcp, DHCP_OFF); */
|
|
netif->dhcp = dhcp;
|
|
}
|
|
|
|
/** Removes a struct dhcp from a netif.
|
|
*
|
|
* ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
|
|
* struct dhcp since the memory is passed back to the heap.
|
|
*
|
|
* @param netif the netif from which to remove the struct dhcp
|
|
*/
|
|
void ICACHE_FLASH_ATTR dhcp_cleanup(struct netif *netif)
|
|
{
|
|
LWIP_ASSERT("netif != NULL", netif != NULL);
|
|
|
|
if (netif->dhcp != NULL) {
|
|
mem_free(netif->dhcp);
|
|
netif->dhcp = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 ICACHE_FLASH_ATTR
|
|
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 */
|
|
os_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 ICACHE_FLASH_ATTR
|
|
dhcp_inform(struct netif *netif)
|
|
{
|
|
struct dhcp dhcp;
|
|
err_t result = ERR_OK;
|
|
struct udp_pcb *pcb;
|
|
|
|
LWIP_ERROR("netif != NULL", (netif != NULL), return;);
|
|
|
|
os_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 ICACHE_FLASH_ATTR
|
|
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
|
|
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 */
|
|
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 ICACHE_FLASH_ATTR 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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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));
|
|
|
|
#if LWIP_NETIF_HOSTNAME
|
|
if (netif->hostname != NULL) {
|
|
const char *p = (const char*)netif->hostname;
|
|
u8_t namelen = (u8_t)os_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(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 13/*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_byte(dhcp, DHCP_OPTION_NTP);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_DOMAIN_NAME);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_NB_TINS);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_NB_TINT);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_NB_TIS);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_PRD);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_STATIC_ROUTER);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_CLASSLESS_STATIC_ROUTER);
|
|
dhcp_option_byte(dhcp, DHCP_OPTION_VSN);
|
|
|
|
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 ICACHE_FLASH_ATTR
|
|
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 we have sub 1 minute lease, t2 and t1 will kick in at the same time. modify by ives at 2014.4.22*/
|
|
if ((dhcp->t1_timeout >= dhcp->t2_timeout) && (dhcp->t2_timeout > 0)) {
|
|
dhcp->t1_timeout = 0;
|
|
}
|
|
|
|
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 */
|
|
|
|
// wjg:back up old ip/netmask/gw
|
|
ip_addr_t ip, mask, gw;
|
|
ip = netif->ip_addr;
|
|
mask = netif->netmask;
|
|
gw = netif->gw;
|
|
|
|
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);
|
|
|
|
// wjg: use old ip/mask/gw to check whether ip/mask/gw changed
|
|
system_station_got_ip_set(&ip, &mask, &gw);
|
|
|
|
/* 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 ICACHE_FLASH_ATTR
|
|
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)os_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 1
|
|
dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
|
|
dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
|
|
#endif
|
|
|
|
#if 1
|
|
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 ICACHE_FLASH_ATTR
|
|
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)os_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 1
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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"));
|
|
if (dhcp == NULL) {
|
|
return ERR_ARG;
|
|
}
|
|
|
|
/* 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 */
|
|
ip_addr_set_zero(&dhcp->offered_ntp_addr);
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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_NTP):
|
|
LWIP_ASSERT("len == 4", len == 4);
|
|
decode_idx = DHCP_OPTION_IDX_NTP;
|
|
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;
|
|
if ((offset < offset_max) && offset_max) { //modify by ives at 2014.4.22
|
|
q = q->next;
|
|
LWIP_ASSERT("next pbuf was null", q);
|
|
options = (u8_t*)q->payload;
|
|
} else {
|
|
/* We've run out of bytes, probably no end marker. Don't proceed. */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* 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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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)));
|
|
|
|
/* DHCP_REQUEST should reuse 'xid' from DHCPOFFER modify by ives at 2014.4.22*/
|
|
if (message_type != DHCP_REQUEST) {
|
|
/* 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 && i < NETIF_MAX_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 ICACHE_FLASH_ATTR
|
|
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 ICACHE_FLASH_ATTR
|
|
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)) &&
|
|
(dhcp->options_out_len < DHCP_OPTIONS_LEN)) {
|
|
/* 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 */
|