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Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies: FatFileSystem mbed WeatherMeters SDFileSystem

NetStack/lwip/core/dhcp.c@0:616601bde9fb, 2012-02-23 (annotated)

Committer:: AdamGreen
Date:: Thu Feb 23 21:38:39 2012 +0000
Revision:: 0:616601bde9fb

Who changed what in which revision?

User	Revision	Line number	New contents of line
AdamGreen	0:616601bde9fb	1	/**
AdamGreen	0:616601bde9fb	2	* @file
AdamGreen	0:616601bde9fb	3	* Dynamic Host Configuration Protocol client
AdamGreen	0:616601bde9fb	4	*
AdamGreen	0:616601bde9fb	5	*/
AdamGreen	0:616601bde9fb	6
AdamGreen	0:616601bde9fb	7	/*
AdamGreen	0:616601bde9fb	8	*
AdamGreen	0:616601bde9fb	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
AdamGreen	0:616601bde9fb	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
AdamGreen	0:616601bde9fb	11	* All rights reserved.
AdamGreen	0:616601bde9fb	12	*
AdamGreen	0:616601bde9fb	13	* Redistribution and use in source and binary forms, with or without modification,
AdamGreen	0:616601bde9fb	14	* are permitted provided that the following conditions are met:
AdamGreen	0:616601bde9fb	15	*
AdamGreen	0:616601bde9fb	16	* 1. Redistributions of source code must retain the above copyright notice,
AdamGreen	0:616601bde9fb	17	* this list of conditions and the following disclaimer.
AdamGreen	0:616601bde9fb	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen	0:616601bde9fb	19	* this list of conditions and the following disclaimer in the documentation
AdamGreen	0:616601bde9fb	20	* and/or other materials provided with the distribution.
AdamGreen	0:616601bde9fb	21	* 3. The name of the author may not be used to endorse or promote products
AdamGreen	0:616601bde9fb	22	* derived from this software without specific prior written permission.
AdamGreen	0:616601bde9fb	23	*
AdamGreen	0:616601bde9fb	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen	0:616601bde9fb	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen	0:616601bde9fb	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen	0:616601bde9fb	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen	0:616601bde9fb	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen	0:616601bde9fb	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen	0:616601bde9fb	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen	0:616601bde9fb	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen	0:616601bde9fb	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen	0:616601bde9fb	33	* OF SUCH DAMAGE.
AdamGreen	0:616601bde9fb	34	*
AdamGreen	0:616601bde9fb	35	* This file is a contribution to the lwIP TCP/IP stack.
AdamGreen	0:616601bde9fb	36	* The Swedish Institute of Computer Science and Adam Dunkels
AdamGreen	0:616601bde9fb	37	* are specifically granted permission to redistribute this
AdamGreen	0:616601bde9fb	38	* source code.
AdamGreen	0:616601bde9fb	39	*
AdamGreen	0:616601bde9fb	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
AdamGreen	0:616601bde9fb	41	*
AdamGreen	0:616601bde9fb	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
AdamGreen	0:616601bde9fb	43	* with RFC 2131 and RFC 2132.
AdamGreen	0:616601bde9fb	44	*
AdamGreen	0:616601bde9fb	45	* TODO:
AdamGreen	0:616601bde9fb	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
AdamGreen	0:616601bde9fb	47	*
AdamGreen	0:616601bde9fb	48	* Please coordinate changes and requests with Leon Woestenberg
AdamGreen	0:616601bde9fb	49	* <leon.woestenberg@gmx.net>
AdamGreen	0:616601bde9fb	50	*
AdamGreen	0:616601bde9fb	51	* Integration with your code:
AdamGreen	0:616601bde9fb	52	*
AdamGreen	0:616601bde9fb	53	* In lwip/dhcp.h
AdamGreen	0:616601bde9fb	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
AdamGreen	0:616601bde9fb	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
AdamGreen	0:616601bde9fb	56	*
AdamGreen	0:616601bde9fb	57	* Then have your application call dhcp_coarse_tmr() and
AdamGreen	0:616601bde9fb	58	* dhcp_fine_tmr() on the defined intervals.
AdamGreen	0:616601bde9fb	59	*
AdamGreen	0:616601bde9fb	60	* dhcp_start(struct netif *netif);
AdamGreen	0:616601bde9fb	61	* starts a DHCP client instance which configures the interface by
AdamGreen	0:616601bde9fb	62	* obtaining an IP address lease and maintaining it.
AdamGreen	0:616601bde9fb	63	*
AdamGreen	0:616601bde9fb	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
AdamGreen	0:616601bde9fb	65	* to remove the DHCP client.
AdamGreen	0:616601bde9fb	66	*
AdamGreen	0:616601bde9fb	67	*/
AdamGreen	0:616601bde9fb	68
AdamGreen	0:616601bde9fb	69	#include "lwip/opt.h"
AdamGreen	0:616601bde9fb	70
AdamGreen	0:616601bde9fb	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
AdamGreen	0:616601bde9fb	72
AdamGreen	0:616601bde9fb	73	#include "lwip/stats.h"
AdamGreen	0:616601bde9fb	74	#include "lwip/mem.h"
AdamGreen	0:616601bde9fb	75	#include "lwip/udp.h"
AdamGreen	0:616601bde9fb	76	#include "lwip/ip_addr.h"
AdamGreen	0:616601bde9fb	77	#include "lwip/netif.h"
AdamGreen	0:616601bde9fb	78	#include "lwip/def.h"
AdamGreen	0:616601bde9fb	79	#include "lwip/sys.h"
AdamGreen	0:616601bde9fb	80	#include "lwip/dhcp.h"
AdamGreen	0:616601bde9fb	81	#include "lwip/autoip.h"
AdamGreen	0:616601bde9fb	82	#include "lwip/dns.h"
AdamGreen	0:616601bde9fb	83	#include "netif/etharp.h"
AdamGreen	0:616601bde9fb	84
AdamGreen	0:616601bde9fb	85	#include <string.h>
AdamGreen	0:616601bde9fb	86
AdamGreen	0:616601bde9fb	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
AdamGreen	0:616601bde9fb	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
AdamGreen	0:616601bde9fb	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
AdamGreen	0:616601bde9fb	90	* #define DHCP_GLOBAL_XID rand()
AdamGreen	0:616601bde9fb	91	*/
AdamGreen	0:616601bde9fb	92	#ifdef DHCP_GLOBAL_XID_HEADER
AdamGreen	0:616601bde9fb	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
AdamGreen	0:616601bde9fb	94	#endif
AdamGreen	0:616601bde9fb	95
AdamGreen	0:616601bde9fb	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
AdamGreen	0:616601bde9fb	97	* MTU is checked to be big enough in dhcp_start */
AdamGreen	0:616601bde9fb	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
AdamGreen	0:616601bde9fb	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
AdamGreen	0:616601bde9fb	100	/** Minimum length for reply before packet is parsed */
AdamGreen	0:616601bde9fb	101	#define DHCP_MIN_REPLY_LEN 44
AdamGreen	0:616601bde9fb	102
AdamGreen	0:616601bde9fb	103	#define REBOOT_TRIES 2
AdamGreen	0:616601bde9fb	104
AdamGreen	0:616601bde9fb	105	/** Option handling: options are parsed in dhcp_parse_reply
AdamGreen	0:616601bde9fb	106	* and saved in an array where other functions can load them from.
AdamGreen	0:616601bde9fb	107	* This might be moved into the struct dhcp (not necessarily since
AdamGreen	0:616601bde9fb	108	* lwIP is single-threaded and the array is only used while in recv
AdamGreen	0:616601bde9fb	109	* callback). */
AdamGreen	0:616601bde9fb	110	#define DHCP_OPTION_IDX_OVERLOAD 0
AdamGreen	0:616601bde9fb	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
AdamGreen	0:616601bde9fb	112	#define DHCP_OPTION_IDX_SERVER_ID 2
AdamGreen	0:616601bde9fb	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
AdamGreen	0:616601bde9fb	114	#define DHCP_OPTION_IDX_T1 4
AdamGreen	0:616601bde9fb	115	#define DHCP_OPTION_IDX_T2 5
AdamGreen	0:616601bde9fb	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
AdamGreen	0:616601bde9fb	117	#define DHCP_OPTION_IDX_ROUTER 7
AdamGreen	0:616601bde9fb	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
AdamGreen	0:616601bde9fb	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
AdamGreen	0:616601bde9fb	120
AdamGreen	0:616601bde9fb	121	/** Holds the decoded option values, only valid while in dhcp_recv.
AdamGreen	0:616601bde9fb	122	@todo: move this into struct dhcp? */
AdamGreen	0:616601bde9fb	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
AdamGreen	0:616601bde9fb	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
AdamGreen	0:616601bde9fb	125	only valid while in dhcp_recv.
AdamGreen	0:616601bde9fb	126	@todo: move this into struct dhcp? */
AdamGreen	0:616601bde9fb	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
AdamGreen	0:616601bde9fb	128
AdamGreen	0:616601bde9fb	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
AdamGreen	0:616601bde9fb	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
AdamGreen	0:616601bde9fb	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
AdamGreen	0:616601bde9fb	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
AdamGreen	0:616601bde9fb	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
AdamGreen	0:616601bde9fb	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
AdamGreen	0:616601bde9fb	135
AdamGreen	0:616601bde9fb	136
AdamGreen	0:616601bde9fb	137	/* DHCP client state machine functions */
AdamGreen	0:616601bde9fb	138	static err_t dhcp_discover(struct netif *netif);
AdamGreen	0:616601bde9fb	139	static err_t dhcp_select(struct netif *netif);
AdamGreen	0:616601bde9fb	140	static void dhcp_bind(struct netif *netif);
AdamGreen	0:616601bde9fb	141	#if DHCP_DOES_ARP_CHECK
AdamGreen	0:616601bde9fb	142	static err_t dhcp_decline(struct netif *netif);
AdamGreen	0:616601bde9fb	143	#endif /* DHCP_DOES_ARP_CHECK */
AdamGreen	0:616601bde9fb	144	static err_t dhcp_rebind(struct netif *netif);
AdamGreen	0:616601bde9fb	145	static err_t dhcp_reboot(struct netif *netif);
AdamGreen	0:616601bde9fb	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
AdamGreen	0:616601bde9fb	147
AdamGreen	0:616601bde9fb	148	/* receive, unfold, parse and free incoming messages */
AdamGreen	0:616601bde9fb	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
AdamGreen	0:616601bde9fb	150
AdamGreen	0:616601bde9fb	151	/* set the DHCP timers */
AdamGreen	0:616601bde9fb	152	static void dhcp_timeout(struct netif *netif);
AdamGreen	0:616601bde9fb	153	static void dhcp_t1_timeout(struct netif *netif);
AdamGreen	0:616601bde9fb	154	static void dhcp_t2_timeout(struct netif *netif);
AdamGreen	0:616601bde9fb	155
AdamGreen	0:616601bde9fb	156	/* build outgoing messages */
AdamGreen	0:616601bde9fb	157	/* create a DHCP message, fill in common headers */
AdamGreen	0:616601bde9fb	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
AdamGreen	0:616601bde9fb	159	/* free a DHCP request */
AdamGreen	0:616601bde9fb	160	static void dhcp_delete_msg(struct dhcp *dhcp);
AdamGreen	0:616601bde9fb	161	/* add a DHCP option (type, then length in bytes) */
AdamGreen	0:616601bde9fb	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
AdamGreen	0:616601bde9fb	163	/* add option values */
AdamGreen	0:616601bde9fb	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
AdamGreen	0:616601bde9fb	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
AdamGreen	0:616601bde9fb	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
AdamGreen	0:616601bde9fb	167	/* always add the DHCP options trailer to end and pad */
AdamGreen	0:616601bde9fb	168	static void dhcp_option_trailer(struct dhcp *dhcp);
AdamGreen	0:616601bde9fb	169
AdamGreen	0:616601bde9fb	170	/**
AdamGreen	0:616601bde9fb	171	* Back-off the DHCP client (because of a received NAK response).
AdamGreen	0:616601bde9fb	172	*
AdamGreen	0:616601bde9fb	173	* Back-off the DHCP client because of a received NAK. Receiving a
AdamGreen	0:616601bde9fb	174	* NAK means the client asked for something non-sensible, for
AdamGreen	0:616601bde9fb	175	* example when it tries to renew a lease obtained on another network.
AdamGreen	0:616601bde9fb	176	*
AdamGreen	0:616601bde9fb	177	* We clear any existing set IP address and restart DHCP negotiation
AdamGreen	0:616601bde9fb	178	* afresh (as per RFC2131 3.2.3).
AdamGreen	0:616601bde9fb	179	*
AdamGreen	0:616601bde9fb	180	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	181	*/
AdamGreen	0:616601bde9fb	182	static void
AdamGreen	0:616601bde9fb	183	dhcp_handle_nak(struct netif *netif)
AdamGreen	0:616601bde9fb	184	{
AdamGreen	0:616601bde9fb	185	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
AdamGreen	0:616601bde9fb	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
AdamGreen	0:616601bde9fb	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
AdamGreen	0:616601bde9fb	189	netif_set_down(netif);
AdamGreen	0:616601bde9fb	190	/* remove IP address from interface */
AdamGreen	0:616601bde9fb	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
AdamGreen	0:616601bde9fb	192	netif_set_gw(netif, IP_ADDR_ANY);
AdamGreen	0:616601bde9fb	193	netif_set_netmask(netif, IP_ADDR_ANY);
AdamGreen	0:616601bde9fb	194	/* Change to a defined state */
AdamGreen	0:616601bde9fb	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
AdamGreen	0:616601bde9fb	196	/* We can immediately restart discovery */
AdamGreen	0:616601bde9fb	197	dhcp_discover(netif);
AdamGreen	0:616601bde9fb	198	}
AdamGreen	0:616601bde9fb	199
AdamGreen	0:616601bde9fb	200	#if DHCP_DOES_ARP_CHECK
AdamGreen	0:616601bde9fb	201	/**
AdamGreen	0:616601bde9fb	202	* Checks if the offered IP address is already in use.
AdamGreen	0:616601bde9fb	203	*
AdamGreen	0:616601bde9fb	204	* It does so by sending an ARP request for the offered address and
AdamGreen	0:616601bde9fb	205	* entering CHECKING state. If no ARP reply is received within a small
AdamGreen	0:616601bde9fb	206	* interval, the address is assumed to be free for use by us.
AdamGreen	0:616601bde9fb	207	*
AdamGreen	0:616601bde9fb	208	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	209	*/
AdamGreen	0:616601bde9fb	210	static void
AdamGreen	0:616601bde9fb	211	dhcp_check(struct netif *netif)
AdamGreen	0:616601bde9fb	212	{
AdamGreen	0:616601bde9fb	213	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	214	err_t result;
AdamGreen	0:616601bde9fb	215	u16_t msecs;
AdamGreen	0:616601bde9fb	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
AdamGreen	0:616601bde9fb	217	(s16_t)netif->name[1]));
AdamGreen	0:616601bde9fb	218	dhcp_set_state(dhcp, DHCP_CHECKING);
AdamGreen	0:616601bde9fb	219	/* create an ARP query for the offered IP address, expecting that no host
AdamGreen	0:616601bde9fb	220	responds, as the IP address should not be in use. */
AdamGreen	0:616601bde9fb	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
AdamGreen	0:616601bde9fb	222	if (result != ERR_OK) {
AdamGreen	0:616601bde9fb	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
AdamGreen	0:616601bde9fb	224	}
AdamGreen	0:616601bde9fb	225	dhcp->tries++;
AdamGreen	0:616601bde9fb	226	msecs = 500;
AdamGreen	0:616601bde9fb	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	229	}
AdamGreen	0:616601bde9fb	230	#endif /* DHCP_DOES_ARP_CHECK */
AdamGreen	0:616601bde9fb	231
AdamGreen	0:616601bde9fb	232	/**
AdamGreen	0:616601bde9fb	233	* Remember the configuration offered by a DHCP server.
AdamGreen	0:616601bde9fb	234	*
AdamGreen	0:616601bde9fb	235	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	236	*/
AdamGreen	0:616601bde9fb	237	static void
AdamGreen	0:616601bde9fb	238	dhcp_handle_offer(struct netif *netif)
AdamGreen	0:616601bde9fb	239	{
AdamGreen	0:616601bde9fb	240	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
AdamGreen	0:616601bde9fb	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
AdamGreen	0:616601bde9fb	243	/* obtain the server address */
AdamGreen	0:616601bde9fb	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
AdamGreen	0:616601bde9fb	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
AdamGreen	0:616601bde9fb	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
AdamGreen	0:616601bde9fb	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
AdamGreen	0:616601bde9fb	248	/* remember offered address */
AdamGreen	0:616601bde9fb	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
AdamGreen	0:616601bde9fb	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
AdamGreen	0:616601bde9fb	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen	0:616601bde9fb	252
AdamGreen	0:616601bde9fb	253	dhcp_select(netif);
AdamGreen	0:616601bde9fb	254	} else {
AdamGreen	0:616601bde9fb	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
AdamGreen	0:616601bde9fb	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
AdamGreen	0:616601bde9fb	257	}
AdamGreen	0:616601bde9fb	258	}
AdamGreen	0:616601bde9fb	259
AdamGreen	0:616601bde9fb	260	/**
AdamGreen	0:616601bde9fb	261	* Select a DHCP server offer out of all offers.
AdamGreen	0:616601bde9fb	262	*
AdamGreen	0:616601bde9fb	263	* Simply select the first offer received.
AdamGreen	0:616601bde9fb	264	*
AdamGreen	0:616601bde9fb	265	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	266	* @return lwIP specific error (see error.h)
AdamGreen	0:616601bde9fb	267	*/
AdamGreen	0:616601bde9fb	268	static err_t
AdamGreen	0:616601bde9fb	269	dhcp_select(struct netif *netif)
AdamGreen	0:616601bde9fb	270	{
AdamGreen	0:616601bde9fb	271	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	272	err_t result;
AdamGreen	0:616601bde9fb	273	u16_t msecs;
AdamGreen	0:616601bde9fb	274
AdamGreen	0:616601bde9fb	275	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));
AdamGreen	0:616601bde9fb	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
AdamGreen	0:616601bde9fb	277
AdamGreen	0:616601bde9fb	278	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen	0:616601bde9fb	280	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen	0:616601bde9fb	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen	0:616601bde9fb	283
AdamGreen	0:616601bde9fb	284	/* MUST request the offered IP address */
AdamGreen	0:616601bde9fb	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen	0:616601bde9fb	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen	0:616601bde9fb	287
AdamGreen	0:616601bde9fb	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
AdamGreen	0:616601bde9fb	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
AdamGreen	0:616601bde9fb	290
AdamGreen	0:616601bde9fb	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
AdamGreen	0:616601bde9fb	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
AdamGreen	0:616601bde9fb	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
AdamGreen	0:616601bde9fb	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
AdamGreen	0:616601bde9fb	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
AdamGreen	0:616601bde9fb	296
AdamGreen	0:616601bde9fb	297	#if LWIP_NETIF_HOSTNAME
AdamGreen	0:616601bde9fb	298	if (netif->hostname != NULL) {
AdamGreen	0:616601bde9fb	299	const char p = (const char)netif->hostname;
AdamGreen	0:616601bde9fb	300	u8_t namelen = (u8_t)strlen(p);
AdamGreen	0:616601bde9fb	301	if (namelen > 0) {
AdamGreen	0:616601bde9fb	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
AdamGreen	0:616601bde9fb	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
AdamGreen	0:616601bde9fb	304	while (*p) {
AdamGreen	0:616601bde9fb	305	dhcp_option_byte(dhcp, *p++);
AdamGreen	0:616601bde9fb	306	}
AdamGreen	0:616601bde9fb	307	}
AdamGreen	0:616601bde9fb	308	}
AdamGreen	0:616601bde9fb	309	#endif /* LWIP_NETIF_HOSTNAME */
AdamGreen	0:616601bde9fb	310
AdamGreen	0:616601bde9fb	311	dhcp_option_trailer(dhcp);
AdamGreen	0:616601bde9fb	312	/* shrink the pbuf to the actual content length */
AdamGreen	0:616601bde9fb	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen	0:616601bde9fb	314
AdamGreen	0:616601bde9fb	315	/* send broadcast to any DHCP server */
AdamGreen	0:616601bde9fb	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	317	dhcp_delete_msg(dhcp);
AdamGreen	0:616601bde9fb	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
AdamGreen	0:616601bde9fb	319	} else {
AdamGreen	0:616601bde9fb	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	321	}
AdamGreen	0:616601bde9fb	322	dhcp->tries++;
AdamGreen	0:616601bde9fb	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
AdamGreen	0:616601bde9fb	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	326	return result;
AdamGreen	0:616601bde9fb	327	}
AdamGreen	0:616601bde9fb	328
AdamGreen	0:616601bde9fb	329	/**
AdamGreen	0:616601bde9fb	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
AdamGreen	0:616601bde9fb	331	*/
AdamGreen	0:616601bde9fb	332	void
AdamGreen	0:616601bde9fb	333	dhcp_coarse_tmr()
AdamGreen	0:616601bde9fb	334	{
AdamGreen	0:616601bde9fb	335	struct netif *netif = netif_list;
AdamGreen	0:616601bde9fb	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
AdamGreen	0:616601bde9fb	337	/* iterate through all network interfaces */
AdamGreen	0:616601bde9fb	338	while (netif != NULL) {
AdamGreen	0:616601bde9fb	339	/* only act on DHCP configured interfaces */
AdamGreen	0:616601bde9fb	340	if (netif->dhcp != NULL) {
AdamGreen	0:616601bde9fb	341	/* timer is active (non zero), and triggers (zeroes) now? */
AdamGreen	0:616601bde9fb	342	if (netif->dhcp->t2_timeout-- == 1) {
AdamGreen	0:616601bde9fb	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
AdamGreen	0:616601bde9fb	344	/* this clients' rebind timeout triggered */
AdamGreen	0:616601bde9fb	345	dhcp_t2_timeout(netif);
AdamGreen	0:616601bde9fb	346	/* timer is active (non zero), and triggers (zeroes) now */
AdamGreen	0:616601bde9fb	347	} else if (netif->dhcp->t1_timeout-- == 1) {
AdamGreen	0:616601bde9fb	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
AdamGreen	0:616601bde9fb	349	/* this clients' renewal timeout triggered */
AdamGreen	0:616601bde9fb	350	dhcp_t1_timeout(netif);
AdamGreen	0:616601bde9fb	351	}
AdamGreen	0:616601bde9fb	352	}
AdamGreen	0:616601bde9fb	353	/* proceed to next netif */
AdamGreen	0:616601bde9fb	354	netif = netif->next;
AdamGreen	0:616601bde9fb	355	}
AdamGreen	0:616601bde9fb	356	}
AdamGreen	0:616601bde9fb	357
AdamGreen	0:616601bde9fb	358	/**
AdamGreen	0:616601bde9fb	359	* DHCP transaction timeout handling
AdamGreen	0:616601bde9fb	360	*
AdamGreen	0:616601bde9fb	361	* A DHCP server is expected to respond within a short period of time.
AdamGreen	0:616601bde9fb	362	* This timer checks whether an outstanding DHCP request is timed out.
AdamGreen	0:616601bde9fb	363	*/
AdamGreen	0:616601bde9fb	364	void
AdamGreen	0:616601bde9fb	365	dhcp_fine_tmr()
AdamGreen	0:616601bde9fb	366	{
AdamGreen	0:616601bde9fb	367	struct netif *netif = netif_list;
AdamGreen	0:616601bde9fb	368	/* loop through netif's */
AdamGreen	0:616601bde9fb	369	while (netif != NULL) {
AdamGreen	0:616601bde9fb	370	/* only act on DHCP configured interfaces */
AdamGreen	0:616601bde9fb	371	if (netif->dhcp != NULL) {
AdamGreen	0:616601bde9fb	372	/* timer is active (non zero), and is about to trigger now */
AdamGreen	0:616601bde9fb	373	if (netif->dhcp->request_timeout > 1) {
AdamGreen	0:616601bde9fb	374	netif->dhcp->request_timeout--;
AdamGreen	0:616601bde9fb	375	}
AdamGreen	0:616601bde9fb	376	else if (netif->dhcp->request_timeout == 1) {
AdamGreen	0:616601bde9fb	377	netif->dhcp->request_timeout--;
AdamGreen	0:616601bde9fb	378	/* { netif->dhcp->request_timeout == 0 } */
AdamGreen	0:616601bde9fb	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
AdamGreen	0:616601bde9fb	380	/* this client's request timeout triggered */
AdamGreen	0:616601bde9fb	381	dhcp_timeout(netif);
AdamGreen	0:616601bde9fb	382	}
AdamGreen	0:616601bde9fb	383	}
AdamGreen	0:616601bde9fb	384	/* proceed to next network interface */
AdamGreen	0:616601bde9fb	385	netif = netif->next;
AdamGreen	0:616601bde9fb	386	}
AdamGreen	0:616601bde9fb	387	}
AdamGreen	0:616601bde9fb	388
AdamGreen	0:616601bde9fb	389	/**
AdamGreen	0:616601bde9fb	390	* A DHCP negotiation transaction, or ARP request, has timed out.
AdamGreen	0:616601bde9fb	391	*
AdamGreen	0:616601bde9fb	392	* The timer that was started with the DHCP or ARP request has
AdamGreen	0:616601bde9fb	393	* timed out, indicating no response was received in time.
AdamGreen	0:616601bde9fb	394	*
AdamGreen	0:616601bde9fb	395	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	396	*/
AdamGreen	0:616601bde9fb	397	static void
AdamGreen	0:616601bde9fb	398	dhcp_timeout(struct netif *netif)
AdamGreen	0:616601bde9fb	399	{
AdamGreen	0:616601bde9fb	400	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
AdamGreen	0:616601bde9fb	402	/* back-off period has passed, or server selection timed out */
AdamGreen	0:616601bde9fb	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
AdamGreen	0:616601bde9fb	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
AdamGreen	0:616601bde9fb	405	dhcp_discover(netif);
AdamGreen	0:616601bde9fb	406	/* receiving the requested lease timed out */
AdamGreen	0:616601bde9fb	407	} else if (dhcp->state == DHCP_REQUESTING) {
AdamGreen	0:616601bde9fb	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
AdamGreen	0:616601bde9fb	409	if (dhcp->tries <= 5) {
AdamGreen	0:616601bde9fb	410	dhcp_select(netif);
AdamGreen	0:616601bde9fb	411	} else {
AdamGreen	0:616601bde9fb	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
AdamGreen	0:616601bde9fb	413	dhcp_release(netif);
AdamGreen	0:616601bde9fb	414	dhcp_discover(netif);
AdamGreen	0:616601bde9fb	415	}
AdamGreen	0:616601bde9fb	416	#if DHCP_DOES_ARP_CHECK
AdamGreen	0:616601bde9fb	417	/* received no ARP reply for the offered address (which is good) */
AdamGreen	0:616601bde9fb	418	} else if (dhcp->state == DHCP_CHECKING) {
AdamGreen	0:616601bde9fb	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
AdamGreen	0:616601bde9fb	420	if (dhcp->tries <= 1) {
AdamGreen	0:616601bde9fb	421	dhcp_check(netif);
AdamGreen	0:616601bde9fb	422	/* no ARP replies on the offered address,
AdamGreen	0:616601bde9fb	423	looks like the IP address is indeed free */
AdamGreen	0:616601bde9fb	424	} else {
AdamGreen	0:616601bde9fb	425	/* bind the interface to the offered address */
AdamGreen	0:616601bde9fb	426	dhcp_bind(netif);
AdamGreen	0:616601bde9fb	427	}
AdamGreen	0:616601bde9fb	428	#endif /* DHCP_DOES_ARP_CHECK */
AdamGreen	0:616601bde9fb	429	}
AdamGreen	0:616601bde9fb	430	/* did not get response to renew request? */
AdamGreen	0:616601bde9fb	431	else if (dhcp->state == DHCP_RENEWING) {
AdamGreen	0:616601bde9fb	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
AdamGreen	0:616601bde9fb	433	/* just retry renewal */
AdamGreen	0:616601bde9fb	434	/* note that the rebind timer will eventually time-out if renew does not work */
AdamGreen	0:616601bde9fb	435	dhcp_renew(netif);
AdamGreen	0:616601bde9fb	436	/* did not get response to rebind request? */
AdamGreen	0:616601bde9fb	437	} else if (dhcp->state == DHCP_REBINDING) {
AdamGreen	0:616601bde9fb	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
AdamGreen	0:616601bde9fb	439	if (dhcp->tries <= 8) {
AdamGreen	0:616601bde9fb	440	dhcp_rebind(netif);
AdamGreen	0:616601bde9fb	441	} else {
AdamGreen	0:616601bde9fb	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
AdamGreen	0:616601bde9fb	443	dhcp_release(netif);
AdamGreen	0:616601bde9fb	444	dhcp_discover(netif);
AdamGreen	0:616601bde9fb	445	}
AdamGreen	0:616601bde9fb	446	} else if (dhcp->state == DHCP_REBOOTING) {
AdamGreen	0:616601bde9fb	447	if (dhcp->tries < REBOOT_TRIES) {
AdamGreen	0:616601bde9fb	448	dhcp_reboot(netif);
AdamGreen	0:616601bde9fb	449	} else {
AdamGreen	0:616601bde9fb	450	dhcp_discover(netif);
AdamGreen	0:616601bde9fb	451	}
AdamGreen	0:616601bde9fb	452	}
AdamGreen	0:616601bde9fb	453	}
AdamGreen	0:616601bde9fb	454
AdamGreen	0:616601bde9fb	455	/**
AdamGreen	0:616601bde9fb	456	* The renewal period has timed out.
AdamGreen	0:616601bde9fb	457	*
AdamGreen	0:616601bde9fb	458	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	459	*/
AdamGreen	0:616601bde9fb	460	static void
AdamGreen	0:616601bde9fb	461	dhcp_t1_timeout(struct netif *netif)
AdamGreen	0:616601bde9fb	462	{
AdamGreen	0:616601bde9fb	463	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
AdamGreen	0:616601bde9fb	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
AdamGreen	0:616601bde9fb	466	(dhcp->state == DHCP_RENEWING)) {
AdamGreen	0:616601bde9fb	467	/* just retry to renew - note that the rebind timer (t2) will
AdamGreen	0:616601bde9fb	468	* eventually time-out if renew tries fail. */
AdamGreen	0:616601bde9fb	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	470	("dhcp_t1_timeout(): must renew\n"));
AdamGreen	0:616601bde9fb	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
AdamGreen	0:616601bde9fb	472	DHCP_RENEWING, not DHCP_BOUND */
AdamGreen	0:616601bde9fb	473	dhcp_renew(netif);
AdamGreen	0:616601bde9fb	474	}
AdamGreen	0:616601bde9fb	475	}
AdamGreen	0:616601bde9fb	476
AdamGreen	0:616601bde9fb	477	/**
AdamGreen	0:616601bde9fb	478	* The rebind period has timed out.
AdamGreen	0:616601bde9fb	479	*
AdamGreen	0:616601bde9fb	480	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	481	*/
AdamGreen	0:616601bde9fb	482	static void
AdamGreen	0:616601bde9fb	483	dhcp_t2_timeout(struct netif *netif)
AdamGreen	0:616601bde9fb	484	{
AdamGreen	0:616601bde9fb	485	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
AdamGreen	0:616601bde9fb	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
AdamGreen	0:616601bde9fb	488	(dhcp->state == DHCP_RENEWING)) {
AdamGreen	0:616601bde9fb	489	/* just retry to rebind */
AdamGreen	0:616601bde9fb	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
AdamGreen	0:616601bde9fb	491	("dhcp_t2_timeout(): must rebind\n"));
AdamGreen	0:616601bde9fb	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
AdamGreen	0:616601bde9fb	493	DHCP_REBINDING, not DHCP_BOUND */
AdamGreen	0:616601bde9fb	494	dhcp_rebind(netif);
AdamGreen	0:616601bde9fb	495	}
AdamGreen	0:616601bde9fb	496	}
AdamGreen	0:616601bde9fb	497
AdamGreen	0:616601bde9fb	498	/**
AdamGreen	0:616601bde9fb	499	* Handle a DHCP ACK packet
AdamGreen	0:616601bde9fb	500	*
AdamGreen	0:616601bde9fb	501	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	502	*/
AdamGreen	0:616601bde9fb	503	static void
AdamGreen	0:616601bde9fb	504	dhcp_handle_ack(struct netif *netif)
AdamGreen	0:616601bde9fb	505	{
AdamGreen	0:616601bde9fb	506	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	507	#if LWIP_DNS
AdamGreen	0:616601bde9fb	508	u8_t n;
AdamGreen	0:616601bde9fb	509	#endif /* LWIP_DNS */
AdamGreen	0:616601bde9fb	510
AdamGreen	0:616601bde9fb	511	/* clear options we might not get from the ACK */
AdamGreen	0:616601bde9fb	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
AdamGreen	0:616601bde9fb	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
AdamGreen	0:616601bde9fb	514	#if LWIP_DHCP_BOOTP_FILE
AdamGreen	0:616601bde9fb	515	ip_addr_set_zero(&dhcp->offered_si_addr);
AdamGreen	0:616601bde9fb	516	#endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen	0:616601bde9fb	517
AdamGreen	0:616601bde9fb	518	/* lease time given? */
AdamGreen	0:616601bde9fb	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
AdamGreen	0:616601bde9fb	520	/* remember offered lease time */
AdamGreen	0:616601bde9fb	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
AdamGreen	0:616601bde9fb	522	}
AdamGreen	0:616601bde9fb	523	/* renewal period given? */
AdamGreen	0:616601bde9fb	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
AdamGreen	0:616601bde9fb	525	/* remember given renewal period */
AdamGreen	0:616601bde9fb	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
AdamGreen	0:616601bde9fb	527	} else {
AdamGreen	0:616601bde9fb	528	/* calculate safe periods for renewal */
AdamGreen	0:616601bde9fb	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
AdamGreen	0:616601bde9fb	530	}
AdamGreen	0:616601bde9fb	531
AdamGreen	0:616601bde9fb	532	/* renewal period given? */
AdamGreen	0:616601bde9fb	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
AdamGreen	0:616601bde9fb	534	/* remember given rebind period */
AdamGreen	0:616601bde9fb	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
AdamGreen	0:616601bde9fb	536	} else {
AdamGreen	0:616601bde9fb	537	/* calculate safe periods for rebinding */
AdamGreen	0:616601bde9fb	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
AdamGreen	0:616601bde9fb	539	}
AdamGreen	0:616601bde9fb	540
AdamGreen	0:616601bde9fb	541	/* (y)our internet address */
AdamGreen	0:616601bde9fb	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
AdamGreen	0:616601bde9fb	543
AdamGreen	0:616601bde9fb	544	#if LWIP_DHCP_BOOTP_FILE
AdamGreen	0:616601bde9fb	545	/* copy boot server address,
AdamGreen	0:616601bde9fb	546	boot file name copied in dhcp_parse_reply if not overloaded */
AdamGreen	0:616601bde9fb	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
AdamGreen	0:616601bde9fb	548	#endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen	0:616601bde9fb	549
AdamGreen	0:616601bde9fb	550	/* subnet mask given? */
AdamGreen	0:616601bde9fb	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
AdamGreen	0:616601bde9fb	552	/* remember given subnet mask */
AdamGreen	0:616601bde9fb	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
AdamGreen	0:616601bde9fb	554	dhcp->subnet_mask_given = 1;
AdamGreen	0:616601bde9fb	555	} else {
AdamGreen	0:616601bde9fb	556	dhcp->subnet_mask_given = 0;
AdamGreen	0:616601bde9fb	557	}
AdamGreen	0:616601bde9fb	558
AdamGreen	0:616601bde9fb	559	/* gateway router */
AdamGreen	0:616601bde9fb	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
AdamGreen	0:616601bde9fb	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
AdamGreen	0:616601bde9fb	562	}
AdamGreen	0:616601bde9fb	563
AdamGreen	0:616601bde9fb	564	#if LWIP_DNS
AdamGreen	0:616601bde9fb	565	/* DNS servers */
AdamGreen	0:616601bde9fb	566	n = 0;
AdamGreen	0:616601bde9fb	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
AdamGreen	0:616601bde9fb	568	ip_addr_t dns_addr;
AdamGreen	0:616601bde9fb	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
AdamGreen	0:616601bde9fb	570	dns_setserver(n, &dns_addr);
AdamGreen	0:616601bde9fb	571	n++;
AdamGreen	0:616601bde9fb	572	}
AdamGreen	0:616601bde9fb	573	#endif /* LWIP_DNS */
AdamGreen	0:616601bde9fb	574	}
AdamGreen	0:616601bde9fb	575
AdamGreen	0:616601bde9fb	576	/** Set a statically allocated struct dhcp to work with.
AdamGreen	0:616601bde9fb	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
AdamGreen	0:616601bde9fb	578	*
AdamGreen	0:616601bde9fb	579	* @param netif the netif for which to set the struct dhcp
AdamGreen	0:616601bde9fb	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
AdamGreen	0:616601bde9fb	581	*/
AdamGreen	0:616601bde9fb	582	void
AdamGreen	0:616601bde9fb	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
AdamGreen	0:616601bde9fb	584	{
AdamGreen	0:616601bde9fb	585	LWIP_ASSERT("netif != NULL", netif != NULL);
AdamGreen	0:616601bde9fb	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
AdamGreen	0:616601bde9fb	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
AdamGreen	0:616601bde9fb	588
AdamGreen	0:616601bde9fb	589	/* clear data structure */
AdamGreen	0:616601bde9fb	590	memset(dhcp, 0, sizeof(struct dhcp));
AdamGreen	0:616601bde9fb	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
AdamGreen	0:616601bde9fb	592	netif->dhcp = dhcp;
AdamGreen	0:616601bde9fb	593	}
AdamGreen	0:616601bde9fb	594
AdamGreen	0:616601bde9fb	595	/**
AdamGreen	0:616601bde9fb	596	* Start DHCP negotiation for a network interface.
AdamGreen	0:616601bde9fb	597	*
AdamGreen	0:616601bde9fb	598	* If no DHCP client instance was attached to this interface,
AdamGreen	0:616601bde9fb	599	* a new client is created first. If a DHCP client instance
AdamGreen	0:616601bde9fb	600	* was already present, it restarts negotiation.
AdamGreen	0:616601bde9fb	601	*
AdamGreen	0:616601bde9fb	602	* @param netif The lwIP network interface
AdamGreen	0:616601bde9fb	603	* @return lwIP error code
AdamGreen	0:616601bde9fb	604	* - ERR_OK - No error
AdamGreen	0:616601bde9fb	605	* - ERR_MEM - Out of memory
AdamGreen	0:616601bde9fb	606	*/
AdamGreen	0:616601bde9fb	607	err_t
AdamGreen	0:616601bde9fb	608	dhcp_start(struct netif *netif)
AdamGreen	0:616601bde9fb	609	{
AdamGreen	0:616601bde9fb	610	struct dhcp *dhcp;
AdamGreen	0:616601bde9fb	611	err_t result = ERR_OK;
AdamGreen	0:616601bde9fb	612
AdamGreen	0:616601bde9fb	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
AdamGreen	0:616601bde9fb	614	dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	615	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));
AdamGreen	0:616601bde9fb	616	/* Remove the flag that says this netif is handled by DHCP,
AdamGreen	0:616601bde9fb	617	it is set when we succeeded starting. */
AdamGreen	0:616601bde9fb	618	netif->flags &= ~NETIF_FLAG_DHCP;
AdamGreen	0:616601bde9fb	619
AdamGreen	0:616601bde9fb	620	/* check hwtype of the netif */
AdamGreen	0:616601bde9fb	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
AdamGreen	0:616601bde9fb	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
AdamGreen	0:616601bde9fb	623	return ERR_ARG;
AdamGreen	0:616601bde9fb	624	}
AdamGreen	0:616601bde9fb	625
AdamGreen	0:616601bde9fb	626	/* check MTU of the netif */
AdamGreen	0:616601bde9fb	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
AdamGreen	0:616601bde9fb	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
AdamGreen	0:616601bde9fb	629	return ERR_MEM;
AdamGreen	0:616601bde9fb	630	}
AdamGreen	0:616601bde9fb	631
AdamGreen	0:616601bde9fb	632	/* no DHCP client attached yet? */
AdamGreen	0:616601bde9fb	633	if (dhcp == NULL) {
AdamGreen	0:616601bde9fb	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
AdamGreen	0:616601bde9fb	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
AdamGreen	0:616601bde9fb	636	if (dhcp == NULL) {
AdamGreen	0:616601bde9fb	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
AdamGreen	0:616601bde9fb	638	return ERR_MEM;
AdamGreen	0:616601bde9fb	639	}
AdamGreen	0:616601bde9fb	640	/* store this dhcp client in the netif */
AdamGreen	0:616601bde9fb	641	netif->dhcp = dhcp;
AdamGreen	0:616601bde9fb	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
AdamGreen	0:616601bde9fb	643	/* already has DHCP client attached */
AdamGreen	0:616601bde9fb	644	} else {
AdamGreen	0:616601bde9fb	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
AdamGreen	0:616601bde9fb	646	if (dhcp->pcb != NULL) {
AdamGreen	0:616601bde9fb	647	udp_remove(dhcp->pcb);
AdamGreen	0:616601bde9fb	648	}
AdamGreen	0:616601bde9fb	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
AdamGreen	0:616601bde9fb	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
AdamGreen	0:616601bde9fb	651	}
AdamGreen	0:616601bde9fb	652
AdamGreen	0:616601bde9fb	653	/* clear data structure */
AdamGreen	0:616601bde9fb	654	memset(dhcp, 0, sizeof(struct dhcp));
AdamGreen	0:616601bde9fb	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
AdamGreen	0:616601bde9fb	656	/* allocate UDP PCB */
AdamGreen	0:616601bde9fb	657	dhcp->pcb = udp_new();
AdamGreen	0:616601bde9fb	658	if (dhcp->pcb == NULL) {
AdamGreen	0:616601bde9fb	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
AdamGreen	0:616601bde9fb	660	return ERR_MEM;
AdamGreen	0:616601bde9fb	661	}
AdamGreen	0:616601bde9fb	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
AdamGreen	0:616601bde9fb	663	/* set up local and remote port for the pcb */
AdamGreen	0:616601bde9fb	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
AdamGreen	0:616601bde9fb	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
AdamGreen	0:616601bde9fb	666	/* set up the recv callback and argument */
AdamGreen	0:616601bde9fb	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
AdamGreen	0:616601bde9fb	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
AdamGreen	0:616601bde9fb	669	/* (re)start the DHCP negotiation */
AdamGreen	0:616601bde9fb	670	result = dhcp_discover(netif);
AdamGreen	0:616601bde9fb	671	if (result != ERR_OK) {
AdamGreen	0:616601bde9fb	672	/* free resources allocated above */
AdamGreen	0:616601bde9fb	673	dhcp_stop(netif);
AdamGreen	0:616601bde9fb	674	return ERR_MEM;
AdamGreen	0:616601bde9fb	675	}
AdamGreen	0:616601bde9fb	676	/* Set the flag that says this netif is handled by DHCP. */
AdamGreen	0:616601bde9fb	677	netif->flags \|= NETIF_FLAG_DHCP;
AdamGreen	0:616601bde9fb	678	return result;
AdamGreen	0:616601bde9fb	679	}
AdamGreen	0:616601bde9fb	680
AdamGreen	0:616601bde9fb	681	/**
AdamGreen	0:616601bde9fb	682	* Inform a DHCP server of our manual configuration.
AdamGreen	0:616601bde9fb	683	*
AdamGreen	0:616601bde9fb	684	* This informs DHCP servers of our fixed IP address configuration
AdamGreen	0:616601bde9fb	685	* by sending an INFORM message. It does not involve DHCP address
AdamGreen	0:616601bde9fb	686	* configuration, it is just here to be nice to the network.
AdamGreen	0:616601bde9fb	687	*
AdamGreen	0:616601bde9fb	688	* @param netif The lwIP network interface
AdamGreen	0:616601bde9fb	689	*/
AdamGreen	0:616601bde9fb	690	void
AdamGreen	0:616601bde9fb	691	dhcp_inform(struct netif *netif)
AdamGreen	0:616601bde9fb	692	{
AdamGreen	0:616601bde9fb	693	struct dhcp dhcp;
AdamGreen	0:616601bde9fb	694	err_t result = ERR_OK;
AdamGreen	0:616601bde9fb	695	struct udp_pcb *pcb;
AdamGreen	0:616601bde9fb	696
AdamGreen	0:616601bde9fb	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
AdamGreen	0:616601bde9fb	698
AdamGreen	0:616601bde9fb	699	memset(&dhcp, 0, sizeof(struct dhcp));
AdamGreen	0:616601bde9fb	700	dhcp_set_state(&dhcp, DHCP_INFORM);
AdamGreen	0:616601bde9fb	701
AdamGreen	0:616601bde9fb	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
AdamGreen	0:616601bde9fb	703	/* re-use existing pcb */
AdamGreen	0:616601bde9fb	704	pcb = netif->dhcp->pcb;
AdamGreen	0:616601bde9fb	705	} else {
AdamGreen	0:616601bde9fb	706	pcb = udp_new();
AdamGreen	0:616601bde9fb	707	if (pcb == NULL) {
AdamGreen	0:616601bde9fb	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
AdamGreen	0:616601bde9fb	709	return;
AdamGreen	0:616601bde9fb	710	}
AdamGreen	0:616601bde9fb	711	dhcp.pcb = pcb;
AdamGreen	0:616601bde9fb	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
AdamGreen	0:616601bde9fb	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
AdamGreen	0:616601bde9fb	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
AdamGreen	0:616601bde9fb	715	}
AdamGreen	0:616601bde9fb	716	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
AdamGreen	0:616601bde9fb	718	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen	0:616601bde9fb	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen	0:616601bde9fb	721
AdamGreen	0:616601bde9fb	722	dhcp_option_trailer(&dhcp);
AdamGreen	0:616601bde9fb	723
AdamGreen	0:616601bde9fb	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
AdamGreen	0:616601bde9fb	725
AdamGreen	0:616601bde9fb	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
AdamGreen	0:616601bde9fb	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	728	dhcp_delete_msg(&dhcp);
AdamGreen	0:616601bde9fb	729	} else {
AdamGreen	0:616601bde9fb	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	731	}
AdamGreen	0:616601bde9fb	732
AdamGreen	0:616601bde9fb	733	if (dhcp.pcb != NULL) {
AdamGreen	0:616601bde9fb	734	/* otherwise, the existing pcb was used */
AdamGreen	0:616601bde9fb	735	udp_remove(dhcp.pcb);
AdamGreen	0:616601bde9fb	736	}
AdamGreen	0:616601bde9fb	737	}
AdamGreen	0:616601bde9fb	738
AdamGreen	0:616601bde9fb	739	/** Handle a possible change in the network configuration.
AdamGreen	0:616601bde9fb	740	*
AdamGreen	0:616601bde9fb	741	* This enters the REBOOTING state to verify that the currently bound
AdamGreen	0:616601bde9fb	742	* address is still valid.
AdamGreen	0:616601bde9fb	743	*/
AdamGreen	0:616601bde9fb	744	void
AdamGreen	0:616601bde9fb	745	dhcp_network_changed(struct netif *netif)
AdamGreen	0:616601bde9fb	746	{
AdamGreen	0:616601bde9fb	747	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	748	if (!dhcp)
AdamGreen	0:616601bde9fb	749	return;
AdamGreen	0:616601bde9fb	750	switch (dhcp->state) {
AdamGreen	0:616601bde9fb	751	case DHCP_REBINDING:
AdamGreen	0:616601bde9fb	752	case DHCP_RENEWING:
AdamGreen	0:616601bde9fb	753	case DHCP_BOUND:
AdamGreen	0:616601bde9fb	754	case DHCP_REBOOTING:
AdamGreen	0:616601bde9fb	755	netif_set_down(netif);
AdamGreen	0:616601bde9fb	756	dhcp->tries = 0;
AdamGreen	0:616601bde9fb	757	dhcp_reboot(netif);
AdamGreen	0:616601bde9fb	758	break;
AdamGreen	0:616601bde9fb	759	case DHCP_OFF:
AdamGreen	0:616601bde9fb	760	/* stay off */
AdamGreen	0:616601bde9fb	761	break;
AdamGreen	0:616601bde9fb	762	default:
AdamGreen	0:616601bde9fb	763	dhcp->tries = 0;
AdamGreen	0:616601bde9fb	764	#if LWIP_DHCP_AUTOIP_COOP
AdamGreen	0:616601bde9fb	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
AdamGreen	0:616601bde9fb	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen	0:616601bde9fb	767	dhcp_discover(netif);
AdamGreen	0:616601bde9fb	768	break;
AdamGreen	0:616601bde9fb	769	}
AdamGreen	0:616601bde9fb	770	}
AdamGreen	0:616601bde9fb	771
AdamGreen	0:616601bde9fb	772	#if DHCP_DOES_ARP_CHECK
AdamGreen	0:616601bde9fb	773	/**
AdamGreen	0:616601bde9fb	774	* Match an ARP reply with the offered IP address.
AdamGreen	0:616601bde9fb	775	*
AdamGreen	0:616601bde9fb	776	* @param netif the network interface on which the reply was received
AdamGreen	0:616601bde9fb	777	* @param addr The IP address we received a reply from
AdamGreen	0:616601bde9fb	778	*/
AdamGreen	0:616601bde9fb	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
AdamGreen	0:616601bde9fb	780	{
AdamGreen	0:616601bde9fb	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
AdamGreen	0:616601bde9fb	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
AdamGreen	0:616601bde9fb	783	/* is a DHCP client doing an ARP check? */
AdamGreen	0:616601bde9fb	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
AdamGreen	0:616601bde9fb	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
AdamGreen	0:616601bde9fb	786	ip4_addr_get_u32(addr)));
AdamGreen	0:616601bde9fb	787	/* did a host respond with the address we
AdamGreen	0:616601bde9fb	788	were offered by the DHCP server? */
AdamGreen	0:616601bde9fb	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
AdamGreen	0:616601bde9fb	790	/* we will not accept the offered address */
AdamGreen	0:616601bde9fb	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
AdamGreen	0:616601bde9fb	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
AdamGreen	0:616601bde9fb	793	dhcp_decline(netif);
AdamGreen	0:616601bde9fb	794	}
AdamGreen	0:616601bde9fb	795	}
AdamGreen	0:616601bde9fb	796	}
AdamGreen	0:616601bde9fb	797
AdamGreen	0:616601bde9fb	798	/**
AdamGreen	0:616601bde9fb	799	* Decline an offered lease.
AdamGreen	0:616601bde9fb	800	*
AdamGreen	0:616601bde9fb	801	* Tell the DHCP server we do not accept the offered address.
AdamGreen	0:616601bde9fb	802	* One reason to decline the lease is when we find out the address
AdamGreen	0:616601bde9fb	803	* is already in use by another host (through ARP).
AdamGreen	0:616601bde9fb	804	*
AdamGreen	0:616601bde9fb	805	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	806	*/
AdamGreen	0:616601bde9fb	807	static err_t
AdamGreen	0:616601bde9fb	808	dhcp_decline(struct netif *netif)
AdamGreen	0:616601bde9fb	809	{
AdamGreen	0:616601bde9fb	810	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	811	err_t result = ERR_OK;
AdamGreen	0:616601bde9fb	812	u16_t msecs;
AdamGreen	0:616601bde9fb	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
AdamGreen	0:616601bde9fb	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
AdamGreen	0:616601bde9fb	815	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
AdamGreen	0:616601bde9fb	817	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen	0:616601bde9fb	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen	0:616601bde9fb	820
AdamGreen	0:616601bde9fb	821	dhcp_option_trailer(dhcp);
AdamGreen	0:616601bde9fb	822	/* resize pbuf to reflect true size of options */
AdamGreen	0:616601bde9fb	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen	0:616601bde9fb	824
AdamGreen	0:616601bde9fb	825	/* per section 4.4.4, broadcast DECLINE messages */
AdamGreen	0:616601bde9fb	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	827	dhcp_delete_msg(dhcp);
AdamGreen	0:616601bde9fb	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
AdamGreen	0:616601bde9fb	829	} else {
AdamGreen	0:616601bde9fb	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
AdamGreen	0:616601bde9fb	831	("dhcp_decline: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	832	}
AdamGreen	0:616601bde9fb	833	dhcp->tries++;
AdamGreen	0:616601bde9fb	834	msecs = 10*1000;
AdamGreen	0:616601bde9fb	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	837	return result;
AdamGreen	0:616601bde9fb	838	}
AdamGreen	0:616601bde9fb	839	#endif /* DHCP_DOES_ARP_CHECK */
AdamGreen	0:616601bde9fb	840
AdamGreen	0:616601bde9fb	841
AdamGreen	0:616601bde9fb	842	/**
AdamGreen	0:616601bde9fb	843	* Start the DHCP process, discover a DHCP server.
AdamGreen	0:616601bde9fb	844	*
AdamGreen	0:616601bde9fb	845	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	846	*/
AdamGreen	0:616601bde9fb	847	static err_t
AdamGreen	0:616601bde9fb	848	dhcp_discover(struct netif *netif)
AdamGreen	0:616601bde9fb	849	{
AdamGreen	0:616601bde9fb	850	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	851	err_t result = ERR_OK;
AdamGreen	0:616601bde9fb	852	u16_t msecs;
AdamGreen	0:616601bde9fb	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
AdamGreen	0:616601bde9fb	854	ip_addr_set_any(&dhcp->offered_ip_addr);
AdamGreen	0:616601bde9fb	855	dhcp_set_state(dhcp, DHCP_SELECTING);
AdamGreen	0:616601bde9fb	856	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
AdamGreen	0:616601bde9fb	858	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
AdamGreen	0:616601bde9fb	860
AdamGreen	0:616601bde9fb	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen	0:616601bde9fb	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen	0:616601bde9fb	863
AdamGreen	0:616601bde9fb	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
AdamGreen	0:616601bde9fb	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
AdamGreen	0:616601bde9fb	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
AdamGreen	0:616601bde9fb	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
AdamGreen	0:616601bde9fb	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
AdamGreen	0:616601bde9fb	869
AdamGreen	0:616601bde9fb	870	dhcp_option_trailer(dhcp);
AdamGreen	0:616601bde9fb	871
AdamGreen	0:616601bde9fb	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
AdamGreen	0:616601bde9fb	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen	0:616601bde9fb	874
AdamGreen	0:616601bde9fb	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
AdamGreen	0:616601bde9fb	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
AdamGreen	0:616601bde9fb	878	dhcp_delete_msg(dhcp);
AdamGreen	0:616601bde9fb	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
AdamGreen	0:616601bde9fb	880	} else {
AdamGreen	0:616601bde9fb	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	882	}
AdamGreen	0:616601bde9fb	883	dhcp->tries++;
AdamGreen	0:616601bde9fb	884	#if LWIP_DHCP_AUTOIP_COOP
AdamGreen	0:616601bde9fb	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
AdamGreen	0:616601bde9fb	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
AdamGreen	0:616601bde9fb	887	autoip_start(netif);
AdamGreen	0:616601bde9fb	888	}
AdamGreen	0:616601bde9fb	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen	0:616601bde9fb	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
AdamGreen	0:616601bde9fb	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	893	return result;
AdamGreen	0:616601bde9fb	894	}
AdamGreen	0:616601bde9fb	895
AdamGreen	0:616601bde9fb	896
AdamGreen	0:616601bde9fb	897	/**
AdamGreen	0:616601bde9fb	898	* Bind the interface to the offered IP address.
AdamGreen	0:616601bde9fb	899	*
AdamGreen	0:616601bde9fb	900	* @param netif network interface to bind to the offered address
AdamGreen	0:616601bde9fb	901	*/
AdamGreen	0:616601bde9fb	902	static void
AdamGreen	0:616601bde9fb	903	dhcp_bind(struct netif *netif)
AdamGreen	0:616601bde9fb	904	{
AdamGreen	0:616601bde9fb	905	u32_t timeout;
AdamGreen	0:616601bde9fb	906	struct dhcp *dhcp;
AdamGreen	0:616601bde9fb	907	ip_addr_t sn_mask, gw_addr;
AdamGreen	0:616601bde9fb	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
AdamGreen	0:616601bde9fb	909	dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
AdamGreen	0:616601bde9fb	911	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));
AdamGreen	0:616601bde9fb	912
AdamGreen	0:616601bde9fb	913	/* temporary DHCP lease? */
AdamGreen	0:616601bde9fb	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
AdamGreen	0:616601bde9fb	915	/* set renewal period timer */
AdamGreen	0:616601bde9fb	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
AdamGreen	0:616601bde9fb	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
AdamGreen	0:616601bde9fb	918	if(timeout > 0xffff) {
AdamGreen	0:616601bde9fb	919	timeout = 0xffff;
AdamGreen	0:616601bde9fb	920	}
AdamGreen	0:616601bde9fb	921	dhcp->t1_timeout = (u16_t)timeout;
AdamGreen	0:616601bde9fb	922	if (dhcp->t1_timeout == 0) {
AdamGreen	0:616601bde9fb	923	dhcp->t1_timeout = 1;
AdamGreen	0:616601bde9fb	924	}
AdamGreen	0:616601bde9fb	925	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
AdamGreen	0:616601bde9fb	926	}
AdamGreen	0:616601bde9fb	927	/* set renewal period timer */
AdamGreen	0:616601bde9fb	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
AdamGreen	0:616601bde9fb	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
AdamGreen	0:616601bde9fb	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
AdamGreen	0:616601bde9fb	931	if(timeout > 0xffff) {
AdamGreen	0:616601bde9fb	932	timeout = 0xffff;
AdamGreen	0:616601bde9fb	933	}
AdamGreen	0:616601bde9fb	934	dhcp->t2_timeout = (u16_t)timeout;
AdamGreen	0:616601bde9fb	935	if (dhcp->t2_timeout == 0) {
AdamGreen	0:616601bde9fb	936	dhcp->t2_timeout = 1;
AdamGreen	0:616601bde9fb	937	}
AdamGreen	0:616601bde9fb	938	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
AdamGreen	0:616601bde9fb	939	}
AdamGreen	0:616601bde9fb	940
AdamGreen	0:616601bde9fb	941	if (dhcp->subnet_mask_given) {
AdamGreen	0:616601bde9fb	942	/* copy offered network mask */
AdamGreen	0:616601bde9fb	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
AdamGreen	0:616601bde9fb	944	} else {
AdamGreen	0:616601bde9fb	945	/* subnet mask not given, choose a safe subnet mask given the network class */
AdamGreen	0:616601bde9fb	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
AdamGreen	0:616601bde9fb	947	if (first_octet <= 127) {
AdamGreen	0:616601bde9fb	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
AdamGreen	0:616601bde9fb	949	} else if (first_octet >= 192) {
AdamGreen	0:616601bde9fb	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
AdamGreen	0:616601bde9fb	951	} else {
AdamGreen	0:616601bde9fb	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
AdamGreen	0:616601bde9fb	953	}
AdamGreen	0:616601bde9fb	954	}
AdamGreen	0:616601bde9fb	955
AdamGreen	0:616601bde9fb	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
AdamGreen	0:616601bde9fb	957	/* gateway address not given? */
AdamGreen	0:616601bde9fb	958	if (ip_addr_isany(&gw_addr)) {
AdamGreen	0:616601bde9fb	959	/* copy network address */
AdamGreen	0:616601bde9fb	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
AdamGreen	0:616601bde9fb	961	/* use first host address on network as gateway */
AdamGreen	0:616601bde9fb	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
AdamGreen	0:616601bde9fb	963	}
AdamGreen	0:616601bde9fb	964
AdamGreen	0:616601bde9fb	965	#if LWIP_DHCP_AUTOIP_COOP
AdamGreen	0:616601bde9fb	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
AdamGreen	0:616601bde9fb	967	autoip_stop(netif);
AdamGreen	0:616601bde9fb	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
AdamGreen	0:616601bde9fb	969	}
AdamGreen	0:616601bde9fb	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen	0:616601bde9fb	971
AdamGreen	0:616601bde9fb	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
AdamGreen	0:616601bde9fb	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen	0:616601bde9fb	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
AdamGreen	0:616601bde9fb	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
AdamGreen	0:616601bde9fb	976	ip4_addr_get_u32(&sn_mask)));
AdamGreen	0:616601bde9fb	977	netif_set_netmask(netif, &sn_mask);
AdamGreen	0:616601bde9fb	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
AdamGreen	0:616601bde9fb	979	ip4_addr_get_u32(&gw_addr)));
AdamGreen	0:616601bde9fb	980	netif_set_gw(netif, &gw_addr);
AdamGreen	0:616601bde9fb	981	/* bring the interface up */
AdamGreen	0:616601bde9fb	982	netif_set_up(netif);
AdamGreen	0:616601bde9fb	983	/* netif is now bound to DHCP leased address */
AdamGreen	0:616601bde9fb	984	dhcp_set_state(dhcp, DHCP_BOUND);
AdamGreen	0:616601bde9fb	985	}
AdamGreen	0:616601bde9fb	986
AdamGreen	0:616601bde9fb	987	/**
AdamGreen	0:616601bde9fb	988	* Renew an existing DHCP lease at the involved DHCP server.
AdamGreen	0:616601bde9fb	989	*
AdamGreen	0:616601bde9fb	990	* @param netif network interface which must renew its lease
AdamGreen	0:616601bde9fb	991	*/
AdamGreen	0:616601bde9fb	992	err_t
AdamGreen	0:616601bde9fb	993	dhcp_renew(struct netif *netif)
AdamGreen	0:616601bde9fb	994	{
AdamGreen	0:616601bde9fb	995	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	996	err_t result;
AdamGreen	0:616601bde9fb	997	u16_t msecs;
AdamGreen	0:616601bde9fb	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
AdamGreen	0:616601bde9fb	999	dhcp_set_state(dhcp, DHCP_RENEWING);
AdamGreen	0:616601bde9fb	1000
AdamGreen	0:616601bde9fb	1001	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen	0:616601bde9fb	1003	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen	0:616601bde9fb	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen	0:616601bde9fb	1006
AdamGreen	0:616601bde9fb	1007	#if LWIP_NETIF_HOSTNAME
AdamGreen	0:616601bde9fb	1008	if (netif->hostname != NULL) {
AdamGreen	0:616601bde9fb	1009	const char p = (const char)netif->hostname;
AdamGreen	0:616601bde9fb	1010	u8_t namelen = (u8_t)strlen(p);
AdamGreen	0:616601bde9fb	1011	if (namelen > 0) {
AdamGreen	0:616601bde9fb	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
AdamGreen	0:616601bde9fb	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
AdamGreen	0:616601bde9fb	1014	while (*p) {
AdamGreen	0:616601bde9fb	1015	dhcp_option_byte(dhcp, *p++);
AdamGreen	0:616601bde9fb	1016	}
AdamGreen	0:616601bde9fb	1017	}
AdamGreen	0:616601bde9fb	1018	}
AdamGreen	0:616601bde9fb	1019	#endif /* LWIP_NETIF_HOSTNAME */
AdamGreen	0:616601bde9fb	1020
AdamGreen	0:616601bde9fb	1021	#if 0
AdamGreen	0:616601bde9fb	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen	0:616601bde9fb	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
AdamGreen	0:616601bde9fb	1024	#endif
AdamGreen	0:616601bde9fb	1025
AdamGreen	0:616601bde9fb	1026	#if 0
AdamGreen	0:616601bde9fb	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
AdamGreen	0:616601bde9fb	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
AdamGreen	0:616601bde9fb	1029	#endif
AdamGreen	0:616601bde9fb	1030	/* append DHCP message trailer */
AdamGreen	0:616601bde9fb	1031	dhcp_option_trailer(dhcp);
AdamGreen	0:616601bde9fb	1032
AdamGreen	0:616601bde9fb	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen	0:616601bde9fb	1034
AdamGreen	0:616601bde9fb	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	1036	dhcp_delete_msg(dhcp);
AdamGreen	0:616601bde9fb	1037
AdamGreen	0:616601bde9fb	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
AdamGreen	0:616601bde9fb	1039	} else {
AdamGreen	0:616601bde9fb	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	1041	}
AdamGreen	0:616601bde9fb	1042	dhcp->tries++;
AdamGreen	0:616601bde9fb	1043	/* back-off on retries, but to a maximum of 20 seconds */
AdamGreen	0:616601bde9fb	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
AdamGreen	0:616601bde9fb	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	1047	return result;
AdamGreen	0:616601bde9fb	1048	}
AdamGreen	0:616601bde9fb	1049
AdamGreen	0:616601bde9fb	1050	/**
AdamGreen	0:616601bde9fb	1051	* Rebind with a DHCP server for an existing DHCP lease.
AdamGreen	0:616601bde9fb	1052	*
AdamGreen	0:616601bde9fb	1053	* @param netif network interface which must rebind with a DHCP server
AdamGreen	0:616601bde9fb	1054	*/
AdamGreen	0:616601bde9fb	1055	static err_t
AdamGreen	0:616601bde9fb	1056	dhcp_rebind(struct netif *netif)
AdamGreen	0:616601bde9fb	1057	{
AdamGreen	0:616601bde9fb	1058	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	1059	err_t result;
AdamGreen	0:616601bde9fb	1060	u16_t msecs;
AdamGreen	0:616601bde9fb	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
AdamGreen	0:616601bde9fb	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
AdamGreen	0:616601bde9fb	1063
AdamGreen	0:616601bde9fb	1064	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen	0:616601bde9fb	1066	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen	0:616601bde9fb	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen	0:616601bde9fb	1069
AdamGreen	0:616601bde9fb	1070	#if LWIP_NETIF_HOSTNAME
AdamGreen	0:616601bde9fb	1071	if (netif->hostname != NULL) {
AdamGreen	0:616601bde9fb	1072	const char p = (const char)netif->hostname;
AdamGreen	0:616601bde9fb	1073	u8_t namelen = (u8_t)strlen(p);
AdamGreen	0:616601bde9fb	1074	if (namelen > 0) {
AdamGreen	0:616601bde9fb	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
AdamGreen	0:616601bde9fb	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
AdamGreen	0:616601bde9fb	1077	while (*p) {
AdamGreen	0:616601bde9fb	1078	dhcp_option_byte(dhcp, *p++);
AdamGreen	0:616601bde9fb	1079	}
AdamGreen	0:616601bde9fb	1080	}
AdamGreen	0:616601bde9fb	1081	}
AdamGreen	0:616601bde9fb	1082	#endif /* LWIP_NETIF_HOSTNAME */
AdamGreen	0:616601bde9fb	1083
AdamGreen	0:616601bde9fb	1084	#if 0
AdamGreen	0:616601bde9fb	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen	0:616601bde9fb	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
AdamGreen	0:616601bde9fb	1087
AdamGreen	0:616601bde9fb	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
AdamGreen	0:616601bde9fb	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
AdamGreen	0:616601bde9fb	1090	#endif
AdamGreen	0:616601bde9fb	1091
AdamGreen	0:616601bde9fb	1092	dhcp_option_trailer(dhcp);
AdamGreen	0:616601bde9fb	1093
AdamGreen	0:616601bde9fb	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen	0:616601bde9fb	1095
AdamGreen	0:616601bde9fb	1096	/* broadcast to server */
AdamGreen	0:616601bde9fb	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	1098	dhcp_delete_msg(dhcp);
AdamGreen	0:616601bde9fb	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
AdamGreen	0:616601bde9fb	1100	} else {
AdamGreen	0:616601bde9fb	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	1102	}
AdamGreen	0:616601bde9fb	1103	dhcp->tries++;
AdamGreen	0:616601bde9fb	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
AdamGreen	0:616601bde9fb	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	1107	return result;
AdamGreen	0:616601bde9fb	1108	}
AdamGreen	0:616601bde9fb	1109
AdamGreen	0:616601bde9fb	1110	/**
AdamGreen	0:616601bde9fb	1111	* Enter REBOOTING state to verify an existing lease
AdamGreen	0:616601bde9fb	1112	*
AdamGreen	0:616601bde9fb	1113	* @param netif network interface which must reboot
AdamGreen	0:616601bde9fb	1114	*/
AdamGreen	0:616601bde9fb	1115	static err_t
AdamGreen	0:616601bde9fb	1116	dhcp_reboot(struct netif *netif)
AdamGreen	0:616601bde9fb	1117	{
AdamGreen	0:616601bde9fb	1118	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	1119	err_t result;
AdamGreen	0:616601bde9fb	1120	u16_t msecs;
AdamGreen	0:616601bde9fb	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
AdamGreen	0:616601bde9fb	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
AdamGreen	0:616601bde9fb	1123
AdamGreen	0:616601bde9fb	1124	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen	0:616601bde9fb	1126	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen	0:616601bde9fb	1128	dhcp_option_short(dhcp, 576);
AdamGreen	0:616601bde9fb	1129
AdamGreen	0:616601bde9fb	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen	0:616601bde9fb	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen	0:616601bde9fb	1132
AdamGreen	0:616601bde9fb	1133	dhcp_option_trailer(dhcp);
AdamGreen	0:616601bde9fb	1134
AdamGreen	0:616601bde9fb	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen	0:616601bde9fb	1136
AdamGreen	0:616601bde9fb	1137	/* broadcast to server */
AdamGreen	0:616601bde9fb	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	1139	dhcp_delete_msg(dhcp);
AdamGreen	0:616601bde9fb	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
AdamGreen	0:616601bde9fb	1141	} else {
AdamGreen	0:616601bde9fb	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	1143	}
AdamGreen	0:616601bde9fb	1144	dhcp->tries++;
AdamGreen	0:616601bde9fb	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
AdamGreen	0:616601bde9fb	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	1148	return result;
AdamGreen	0:616601bde9fb	1149	}
AdamGreen	0:616601bde9fb	1150
AdamGreen	0:616601bde9fb	1151
AdamGreen	0:616601bde9fb	1152	/**
AdamGreen	0:616601bde9fb	1153	* Release a DHCP lease.
AdamGreen	0:616601bde9fb	1154	*
AdamGreen	0:616601bde9fb	1155	* @param netif network interface which must release its lease
AdamGreen	0:616601bde9fb	1156	*/
AdamGreen	0:616601bde9fb	1157	err_t
AdamGreen	0:616601bde9fb	1158	dhcp_release(struct netif *netif)
AdamGreen	0:616601bde9fb	1159	{
AdamGreen	0:616601bde9fb	1160	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	1161	err_t result;
AdamGreen	0:616601bde9fb	1162	u16_t msecs;
AdamGreen	0:616601bde9fb	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
AdamGreen	0:616601bde9fb	1164
AdamGreen	0:616601bde9fb	1165	/* idle DHCP client */
AdamGreen	0:616601bde9fb	1166	dhcp_set_state(dhcp, DHCP_OFF);
AdamGreen	0:616601bde9fb	1167	/* clean old DHCP offer */
AdamGreen	0:616601bde9fb	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
AdamGreen	0:616601bde9fb	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
AdamGreen	0:616601bde9fb	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
AdamGreen	0:616601bde9fb	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
AdamGreen	0:616601bde9fb	1172	#if LWIP_DHCP_BOOTP_FILE
AdamGreen	0:616601bde9fb	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
AdamGreen	0:616601bde9fb	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen	0:616601bde9fb	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
AdamGreen	0:616601bde9fb	1176
AdamGreen	0:616601bde9fb	1177	/* create and initialize the DHCP message header */
AdamGreen	0:616601bde9fb	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
AdamGreen	0:616601bde9fb	1179	if (result == ERR_OK) {
AdamGreen	0:616601bde9fb	1180	dhcp_option_trailer(dhcp);
AdamGreen	0:616601bde9fb	1181
AdamGreen	0:616601bde9fb	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen	0:616601bde9fb	1183
AdamGreen	0:616601bde9fb	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
AdamGreen	0:616601bde9fb	1185	dhcp_delete_msg(dhcp);
AdamGreen	0:616601bde9fb	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
AdamGreen	0:616601bde9fb	1187	} else {
AdamGreen	0:616601bde9fb	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
AdamGreen	0:616601bde9fb	1189	}
AdamGreen	0:616601bde9fb	1190	dhcp->tries++;
AdamGreen	0:616601bde9fb	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
AdamGreen	0:616601bde9fb	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen	0:616601bde9fb	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen	0:616601bde9fb	1194	/* bring the interface down */
AdamGreen	0:616601bde9fb	1195	netif_set_down(netif);
AdamGreen	0:616601bde9fb	1196	/* remove IP address from interface */
AdamGreen	0:616601bde9fb	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
AdamGreen	0:616601bde9fb	1198	netif_set_gw(netif, IP_ADDR_ANY);
AdamGreen	0:616601bde9fb	1199	netif_set_netmask(netif, IP_ADDR_ANY);
AdamGreen	0:616601bde9fb	1200
AdamGreen	0:616601bde9fb	1201	return result;
AdamGreen	0:616601bde9fb	1202	}
AdamGreen	0:616601bde9fb	1203
AdamGreen	0:616601bde9fb	1204	/**
AdamGreen	0:616601bde9fb	1205	* Remove the DHCP client from the interface.
AdamGreen	0:616601bde9fb	1206	*
AdamGreen	0:616601bde9fb	1207	* @param netif The network interface to stop DHCP on
AdamGreen	0:616601bde9fb	1208	*/
AdamGreen	0:616601bde9fb	1209	void
AdamGreen	0:616601bde9fb	1210	dhcp_stop(struct netif *netif)
AdamGreen	0:616601bde9fb	1211	{
AdamGreen	0:616601bde9fb	1212	struct dhcp *dhcp;
AdamGreen	0:616601bde9fb	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
AdamGreen	0:616601bde9fb	1214	dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	1215	/* Remove the flag that says this netif is handled by DHCP. */
AdamGreen	0:616601bde9fb	1216	netif->flags &= ~NETIF_FLAG_DHCP;
AdamGreen	0:616601bde9fb	1217
AdamGreen	0:616601bde9fb	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
AdamGreen	0:616601bde9fb	1219	/* netif is DHCP configured? */
AdamGreen	0:616601bde9fb	1220	if (dhcp != NULL) {
AdamGreen	0:616601bde9fb	1221	#if LWIP_DHCP_AUTOIP_COOP
AdamGreen	0:616601bde9fb	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
AdamGreen	0:616601bde9fb	1223	autoip_stop(netif);
AdamGreen	0:616601bde9fb	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
AdamGreen	0:616601bde9fb	1225	}
AdamGreen	0:616601bde9fb	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen	0:616601bde9fb	1227
AdamGreen	0:616601bde9fb	1228	if (dhcp->pcb != NULL) {
AdamGreen	0:616601bde9fb	1229	udp_remove(dhcp->pcb);
AdamGreen	0:616601bde9fb	1230	dhcp->pcb = NULL;
AdamGreen	0:616601bde9fb	1231	}
AdamGreen	0:616601bde9fb	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
AdamGreen	0:616601bde9fb	1233	dhcp_set_state(dhcp, DHCP_OFF);
AdamGreen	0:616601bde9fb	1234	}
AdamGreen	0:616601bde9fb	1235	}
AdamGreen	0:616601bde9fb	1236
AdamGreen	0:616601bde9fb	1237	/*
AdamGreen	0:616601bde9fb	1238	* Set the DHCP state of a DHCP client.
AdamGreen	0:616601bde9fb	1239	*
AdamGreen	0:616601bde9fb	1240	* If the state changed, reset the number of tries.
AdamGreen	0:616601bde9fb	1241	*/
AdamGreen	0:616601bde9fb	1242	static void
AdamGreen	0:616601bde9fb	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
AdamGreen	0:616601bde9fb	1244	{
AdamGreen	0:616601bde9fb	1245	if (new_state != dhcp->state) {
AdamGreen	0:616601bde9fb	1246	dhcp->state = new_state;
AdamGreen	0:616601bde9fb	1247	dhcp->tries = 0;
AdamGreen	0:616601bde9fb	1248	dhcp->request_timeout = 0;
AdamGreen	0:616601bde9fb	1249	}
AdamGreen	0:616601bde9fb	1250	}
AdamGreen	0:616601bde9fb	1251
AdamGreen	0:616601bde9fb	1252	/*
AdamGreen	0:616601bde9fb	1253	* Concatenate an option type and length field to the outgoing
AdamGreen	0:616601bde9fb	1254	* DHCP message.
AdamGreen	0:616601bde9fb	1255	*
AdamGreen	0:616601bde9fb	1256	*/
AdamGreen	0:616601bde9fb	1257	static void
AdamGreen	0:616601bde9fb	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
AdamGreen	0:616601bde9fb	1259	{
AdamGreen	0:616601bde9fb	1260	LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
AdamGreen	0:616601bde9fb	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
AdamGreen	0:616601bde9fb	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
AdamGreen	0:616601bde9fb	1263	}
AdamGreen	0:616601bde9fb	1264	/*
AdamGreen	0:616601bde9fb	1265	* Concatenate a single byte to the outgoing DHCP message.
AdamGreen	0:616601bde9fb	1266	*
AdamGreen	0:616601bde9fb	1267	*/
AdamGreen	0:616601bde9fb	1268	static void
AdamGreen	0:616601bde9fb	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
AdamGreen	0:616601bde9fb	1270	{
AdamGreen	0:616601bde9fb	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
AdamGreen	0:616601bde9fb	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
AdamGreen	0:616601bde9fb	1273	}
AdamGreen	0:616601bde9fb	1274
AdamGreen	0:616601bde9fb	1275	static void
AdamGreen	0:616601bde9fb	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
AdamGreen	0:616601bde9fb	1277	{
AdamGreen	0:616601bde9fb	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
AdamGreen	0:616601bde9fb	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
AdamGreen	0:616601bde9fb	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
AdamGreen	0:616601bde9fb	1281	}
AdamGreen	0:616601bde9fb	1282
AdamGreen	0:616601bde9fb	1283	static void
AdamGreen	0:616601bde9fb	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
AdamGreen	0:616601bde9fb	1285	{
AdamGreen	0:616601bde9fb	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
AdamGreen	0:616601bde9fb	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
AdamGreen	0:616601bde9fb	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
AdamGreen	0:616601bde9fb	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
AdamGreen	0:616601bde9fb	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
AdamGreen	0:616601bde9fb	1291	}
AdamGreen	0:616601bde9fb	1292
AdamGreen	0:616601bde9fb	1293	/**
AdamGreen	0:616601bde9fb	1294	* Extract the DHCP message and the DHCP options.
AdamGreen	0:616601bde9fb	1295	*
AdamGreen	0:616601bde9fb	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
AdamGreen	0:616601bde9fb	1297	* piece of memory. As a DHCP message is variable sized by its options,
AdamGreen	0:616601bde9fb	1298	* and also allows overriding some fields for options, the easy approach
AdamGreen	0:616601bde9fb	1299	* is to first unfold the options into a conitguous piece of memory, and
AdamGreen	0:616601bde9fb	1300	* use that further on.
AdamGreen	0:616601bde9fb	1301	*
AdamGreen	0:616601bde9fb	1302	*/
AdamGreen	0:616601bde9fb	1303	static err_t
AdamGreen	0:616601bde9fb	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
AdamGreen	0:616601bde9fb	1305	{
AdamGreen	0:616601bde9fb	1306	u8_t *options;
AdamGreen	0:616601bde9fb	1307	u16_t offset;
AdamGreen	0:616601bde9fb	1308	u16_t offset_max;
AdamGreen	0:616601bde9fb	1309	u16_t options_idx;
AdamGreen	0:616601bde9fb	1310	u16_t options_idx_max;
AdamGreen	0:616601bde9fb	1311	struct pbuf *q;
AdamGreen	0:616601bde9fb	1312	int parse_file_as_options = 0;
AdamGreen	0:616601bde9fb	1313	int parse_sname_as_options = 0;
AdamGreen	0:616601bde9fb	1314
AdamGreen	0:616601bde9fb	1315	/* clear received options */
AdamGreen	0:616601bde9fb	1316	dhcp_clear_all_options(dhcp);
AdamGreen	0:616601bde9fb	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
AdamGreen	0:616601bde9fb	1318	if (p->len < DHCP_SNAME_OFS) {
AdamGreen	0:616601bde9fb	1319	return ERR_BUF;
AdamGreen	0:616601bde9fb	1320	}
AdamGreen	0:616601bde9fb	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
AdamGreen	0:616601bde9fb	1322	#if LWIP_DHCP_BOOTP_FILE
AdamGreen	0:616601bde9fb	1323	/* clear boot file name */
AdamGreen	0:616601bde9fb	1324	dhcp->boot_file_name[0] = 0;
AdamGreen	0:616601bde9fb	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen	0:616601bde9fb	1326
AdamGreen	0:616601bde9fb	1327	/* parse options */
AdamGreen	0:616601bde9fb	1328
AdamGreen	0:616601bde9fb	1329	/* start with options field */
AdamGreen	0:616601bde9fb	1330	options_idx = DHCP_OPTIONS_OFS;
AdamGreen	0:616601bde9fb	1331	/* parse options to the end of the received packet */
AdamGreen	0:616601bde9fb	1332	options_idx_max = p->tot_len;
AdamGreen	0:616601bde9fb	1333	again:
AdamGreen	0:616601bde9fb	1334	q = p;
AdamGreen	0:616601bde9fb	1335	while((q != NULL) && (options_idx >= q->len)) {
AdamGreen	0:616601bde9fb	1336	options_idx -= q->len;
AdamGreen	0:616601bde9fb	1337	options_idx_max -= q->len;
AdamGreen	0:616601bde9fb	1338	q = q->next;
AdamGreen	0:616601bde9fb	1339	}
AdamGreen	0:616601bde9fb	1340	if (q == NULL) {
AdamGreen	0:616601bde9fb	1341	return ERR_BUF;
AdamGreen	0:616601bde9fb	1342	}
AdamGreen	0:616601bde9fb	1343	offset = options_idx;
AdamGreen	0:616601bde9fb	1344	offset_max = options_idx_max;
AdamGreen	0:616601bde9fb	1345	options = (u8_t*)q->payload;
AdamGreen	0:616601bde9fb	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
AdamGreen	0:616601bde9fb	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
AdamGreen	0:616601bde9fb	1348	u8_t op = options[offset];
AdamGreen	0:616601bde9fb	1349	u8_t len;
AdamGreen	0:616601bde9fb	1350	u8_t decode_len = 0;
AdamGreen	0:616601bde9fb	1351	int decode_idx = -1;
AdamGreen	0:616601bde9fb	1352	u16_t val_offset = offset + 2;
AdamGreen	0:616601bde9fb	1353	/* len byte might be in the next pbuf */
AdamGreen	0:616601bde9fb	1354	if (offset + 1 < q->len) {
AdamGreen	0:616601bde9fb	1355	len = options[offset + 1];
AdamGreen	0:616601bde9fb	1356	} else {
AdamGreen	0:616601bde9fb	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
AdamGreen	0:616601bde9fb	1358	}
AdamGreen	0:616601bde9fb	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
AdamGreen	0:616601bde9fb	1360	decode_len = len;
AdamGreen	0:616601bde9fb	1361	switch(op) {
AdamGreen	0:616601bde9fb	1362	/* case(DHCP_OPTION_END): handled above */
AdamGreen	0:616601bde9fb	1363	case(DHCP_OPTION_PAD):
AdamGreen	0:616601bde9fb	1364	/* special option: no len encoded */
AdamGreen	0:616601bde9fb	1365	decode_len = len = 0;
AdamGreen	0:616601bde9fb	1366	/* will be increased below */
AdamGreen	0:616601bde9fb	1367	offset--;
AdamGreen	0:616601bde9fb	1368	break;
AdamGreen	0:616601bde9fb	1369	case(DHCP_OPTION_SUBNET_MASK):
AdamGreen	0:616601bde9fb	1370	LWIP_ASSERT("len == 4", len == 4);
AdamGreen	0:616601bde9fb	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
AdamGreen	0:616601bde9fb	1372	break;
AdamGreen	0:616601bde9fb	1373	case(DHCP_OPTION_ROUTER):
AdamGreen	0:616601bde9fb	1374	decode_len = 4; /* only copy the first given router */
AdamGreen	0:616601bde9fb	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
AdamGreen	0:616601bde9fb	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
AdamGreen	0:616601bde9fb	1377	break;
AdamGreen	0:616601bde9fb	1378	case(DHCP_OPTION_DNS_SERVER):
AdamGreen	0:616601bde9fb	1379	/* special case: there might be more than one server */
AdamGreen	0:616601bde9fb	1380	LWIP_ASSERT("len %% 4 == 0", len % 4 == 0);
AdamGreen	0:616601bde9fb	1381	/* limit number of DNS servers */
AdamGreen	0:616601bde9fb	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
AdamGreen	0:616601bde9fb	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
AdamGreen	0:616601bde9fb	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
AdamGreen	0:616601bde9fb	1385	break;
AdamGreen	0:616601bde9fb	1386	case(DHCP_OPTION_LEASE_TIME):
AdamGreen	0:616601bde9fb	1387	LWIP_ASSERT("len == 4", len == 4);
AdamGreen	0:616601bde9fb	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
AdamGreen	0:616601bde9fb	1389	break;
AdamGreen	0:616601bde9fb	1390	case(DHCP_OPTION_OVERLOAD):
AdamGreen	0:616601bde9fb	1391	LWIP_ASSERT("len == 1", len == 1);
AdamGreen	0:616601bde9fb	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
AdamGreen	0:616601bde9fb	1393	break;
AdamGreen	0:616601bde9fb	1394	case(DHCP_OPTION_MESSAGE_TYPE):
AdamGreen	0:616601bde9fb	1395	LWIP_ASSERT("len == 1", len == 1);
AdamGreen	0:616601bde9fb	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
AdamGreen	0:616601bde9fb	1397	break;
AdamGreen	0:616601bde9fb	1398	case(DHCP_OPTION_SERVER_ID):
AdamGreen	0:616601bde9fb	1399	LWIP_ASSERT("len == 4", len == 4);
AdamGreen	0:616601bde9fb	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
AdamGreen	0:616601bde9fb	1401	break;
AdamGreen	0:616601bde9fb	1402	case(DHCP_OPTION_T1):
AdamGreen	0:616601bde9fb	1403	LWIP_ASSERT("len == 4", len == 4);
AdamGreen	0:616601bde9fb	1404	decode_idx = DHCP_OPTION_IDX_T1;
AdamGreen	0:616601bde9fb	1405	break;
AdamGreen	0:616601bde9fb	1406	case(DHCP_OPTION_T2):
AdamGreen	0:616601bde9fb	1407	LWIP_ASSERT("len == 4", len == 4);
AdamGreen	0:616601bde9fb	1408	decode_idx = DHCP_OPTION_IDX_T2;
AdamGreen	0:616601bde9fb	1409	break;
AdamGreen	0:616601bde9fb	1410	default:
AdamGreen	0:616601bde9fb	1411	decode_len = 0;
AdamGreen	0:616601bde9fb	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
AdamGreen	0:616601bde9fb	1413	break;
AdamGreen	0:616601bde9fb	1414	}
AdamGreen	0:616601bde9fb	1415	offset += len + 2;
AdamGreen	0:616601bde9fb	1416	if (decode_len > 0) {
AdamGreen	0:616601bde9fb	1417	u32_t value = 0;
AdamGreen	0:616601bde9fb	1418	u16_t copy_len;
AdamGreen	0:616601bde9fb	1419	decode_next:
AdamGreen	0:616601bde9fb	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
AdamGreen	0:616601bde9fb	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
AdamGreen	0:616601bde9fb	1422	copy_len = LWIP_MIN(decode_len, 4);
AdamGreen	0:616601bde9fb	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
AdamGreen	0:616601bde9fb	1424	if (decode_len > 4) {
AdamGreen	0:616601bde9fb	1425	/* decode more than one u32_t */
AdamGreen	0:616601bde9fb	1426	LWIP_ASSERT("decode_len %% 4 == 0", decode_len % 4 == 0);
AdamGreen	0:616601bde9fb	1427	dhcp_got_option(dhcp, decode_idx);
AdamGreen	0:616601bde9fb	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
AdamGreen	0:616601bde9fb	1429	decode_len -= 4;
AdamGreen	0:616601bde9fb	1430	val_offset += 4;
AdamGreen	0:616601bde9fb	1431	decode_idx++;
AdamGreen	0:616601bde9fb	1432	goto decode_next;
AdamGreen	0:616601bde9fb	1433	} else if (decode_len == 4) {
AdamGreen	0:616601bde9fb	1434	value = ntohl(value);
AdamGreen	0:616601bde9fb	1435	} else {
AdamGreen	0:616601bde9fb	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
AdamGreen	0:616601bde9fb	1437	value = ((u8_t*)&value)[0];
AdamGreen	0:616601bde9fb	1438	}
AdamGreen	0:616601bde9fb	1439	dhcp_got_option(dhcp, decode_idx);
AdamGreen	0:616601bde9fb	1440	dhcp_set_option_value(dhcp, decode_idx, value);
AdamGreen	0:616601bde9fb	1441	}
AdamGreen	0:616601bde9fb	1442	if (offset >= q->len) {
AdamGreen	0:616601bde9fb	1443	offset -= q->len;
AdamGreen	0:616601bde9fb	1444	offset_max -= q->len;
AdamGreen	0:616601bde9fb	1445	q = q->next;
AdamGreen	0:616601bde9fb	1446	options = (u8_t*)q->payload;
AdamGreen	0:616601bde9fb	1447	}
AdamGreen	0:616601bde9fb	1448	}
AdamGreen	0:616601bde9fb	1449	/* is this an overloaded message? */
AdamGreen	0:616601bde9fb	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
AdamGreen	0:616601bde9fb	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
AdamGreen	0:616601bde9fb	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
AdamGreen	0:616601bde9fb	1453	if (overload == DHCP_OVERLOAD_FILE) {
AdamGreen	0:616601bde9fb	1454	parse_file_as_options = 1;
AdamGreen	0:616601bde9fb	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
AdamGreen	0:616601bde9fb	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
AdamGreen	0:616601bde9fb	1457	parse_sname_as_options = 1;
AdamGreen	0:616601bde9fb	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
AdamGreen	0:616601bde9fb	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
AdamGreen	0:616601bde9fb	1460	parse_sname_as_options = 1;
AdamGreen	0:616601bde9fb	1461	parse_file_as_options = 1;
AdamGreen	0:616601bde9fb	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
AdamGreen	0:616601bde9fb	1463	} else {
AdamGreen	0:616601bde9fb	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
AdamGreen	0:616601bde9fb	1465	}
AdamGreen	0:616601bde9fb	1466	#if LWIP_DHCP_BOOTP_FILE
AdamGreen	0:616601bde9fb	1467	if (!parse_file_as_options) {
AdamGreen	0:616601bde9fb	1468	/* only do this for ACK messages */
AdamGreen	0:616601bde9fb	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
AdamGreen	0:616601bde9fb	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
AdamGreen	0:616601bde9fb	1471	/* copy bootp file name, don't care for sname (server hostname) */
AdamGreen	0:616601bde9fb	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
AdamGreen	0:616601bde9fb	1473	/* make sure the string is really NULL-terminated */
AdamGreen	0:616601bde9fb	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
AdamGreen	0:616601bde9fb	1475	}
AdamGreen	0:616601bde9fb	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen	0:616601bde9fb	1477	}
AdamGreen	0:616601bde9fb	1478	if (parse_file_as_options) {
AdamGreen	0:616601bde9fb	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
AdamGreen	0:616601bde9fb	1480	parse_file_as_options = 0;
AdamGreen	0:616601bde9fb	1481	options_idx = DHCP_FILE_OFS;
AdamGreen	0:616601bde9fb	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
AdamGreen	0:616601bde9fb	1483	goto again;
AdamGreen	0:616601bde9fb	1484	} else if (parse_sname_as_options) {
AdamGreen	0:616601bde9fb	1485	parse_sname_as_options = 0;
AdamGreen	0:616601bde9fb	1486	options_idx = DHCP_SNAME_OFS;
AdamGreen	0:616601bde9fb	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
AdamGreen	0:616601bde9fb	1488	goto again;
AdamGreen	0:616601bde9fb	1489	}
AdamGreen	0:616601bde9fb	1490	return ERR_OK;
AdamGreen	0:616601bde9fb	1491	}
AdamGreen	0:616601bde9fb	1492
AdamGreen	0:616601bde9fb	1493	/**
AdamGreen	0:616601bde9fb	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
AdamGreen	0:616601bde9fb	1495	*/
AdamGreen	0:616601bde9fb	1496	static void
AdamGreen	0:616601bde9fb	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
AdamGreen	0:616601bde9fb	1498	{
AdamGreen	0:616601bde9fb	1499	struct netif netif = (struct netif )arg;
AdamGreen	0:616601bde9fb	1500	struct dhcp *dhcp = netif->dhcp;
AdamGreen	0:616601bde9fb	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
AdamGreen	0:616601bde9fb	1502	u8_t msg_type;
AdamGreen	0:616601bde9fb	1503	u8_t i;
AdamGreen	0:616601bde9fb	1504	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,
AdamGreen	0:616601bde9fb	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
AdamGreen	0:616601bde9fb	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
AdamGreen	0:616601bde9fb	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
AdamGreen	0:616601bde9fb	1508	/* prevent warnings about unused arguments */
AdamGreen	0:616601bde9fb	1509	LWIP_UNUSED_ARG(pcb);
AdamGreen	0:616601bde9fb	1510	LWIP_UNUSED_ARG(addr);
AdamGreen	0:616601bde9fb	1511	LWIP_UNUSED_ARG(port);
AdamGreen	0:616601bde9fb	1512
AdamGreen	0:616601bde9fb	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
AdamGreen	0:616601bde9fb	1514
AdamGreen	0:616601bde9fb	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
AdamGreen	0:616601bde9fb	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
AdamGreen	0:616601bde9fb	1517	goto free_pbuf_and_return;
AdamGreen	0:616601bde9fb	1518	}
AdamGreen	0:616601bde9fb	1519
AdamGreen	0:616601bde9fb	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
AdamGreen	0:616601bde9fb	1521	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));
AdamGreen	0:616601bde9fb	1522	goto free_pbuf_and_return;
AdamGreen	0:616601bde9fb	1523	}
AdamGreen	0:616601bde9fb	1524	/* iterate through hardware address and match against DHCP message */
AdamGreen	0:616601bde9fb	1525	for (i = 0; i < netif->hwaddr_len; i++) {
AdamGreen	0:616601bde9fb	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
AdamGreen	0:616601bde9fb	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
AdamGreen	0:616601bde9fb	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
AdamGreen	0:616601bde9fb	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
AdamGreen	0:616601bde9fb	1530	goto free_pbuf_and_return;
AdamGreen	0:616601bde9fb	1531	}
AdamGreen	0:616601bde9fb	1532	}
AdamGreen	0:616601bde9fb	1533	/* match transaction ID against what we expected */
AdamGreen	0:616601bde9fb	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
AdamGreen	0:616601bde9fb	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
AdamGreen	0:616601bde9fb	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
AdamGreen	0:616601bde9fb	1537	goto free_pbuf_and_return;
AdamGreen	0:616601bde9fb	1538	}
AdamGreen	0:616601bde9fb	1539	/* option fields could be unfold? */
AdamGreen	0:616601bde9fb	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
AdamGreen	0:616601bde9fb	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
AdamGreen	0:616601bde9fb	1542	("problem unfolding DHCP message - too short on memory?\n"));
AdamGreen	0:616601bde9fb	1543	goto free_pbuf_and_return;
AdamGreen	0:616601bde9fb	1544	}
AdamGreen	0:616601bde9fb	1545
AdamGreen	0:616601bde9fb	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
AdamGreen	0:616601bde9fb	1547	/* obtain pointer to DHCP message type */
AdamGreen	0:616601bde9fb	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
AdamGreen	0:616601bde9fb	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
AdamGreen	0:616601bde9fb	1550	goto free_pbuf_and_return;
AdamGreen	0:616601bde9fb	1551	}
AdamGreen	0:616601bde9fb	1552
AdamGreen	0:616601bde9fb	1553	/* read DHCP message type */
AdamGreen	0:616601bde9fb	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
AdamGreen	0:616601bde9fb	1555	/* message type is DHCP ACK? */
AdamGreen	0:616601bde9fb	1556	if (msg_type == DHCP_ACK) {
AdamGreen	0:616601bde9fb	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
AdamGreen	0:616601bde9fb	1558	/* in requesting state? */
AdamGreen	0:616601bde9fb	1559	if (dhcp->state == DHCP_REQUESTING) {
AdamGreen	0:616601bde9fb	1560	dhcp_handle_ack(netif);
AdamGreen	0:616601bde9fb	1561	#if DHCP_DOES_ARP_CHECK
AdamGreen	0:616601bde9fb	1562	/* check if the acknowledged lease address is already in use */
AdamGreen	0:616601bde9fb	1563	dhcp_check(netif);
AdamGreen	0:616601bde9fb	1564	#else
AdamGreen	0:616601bde9fb	1565	/* bind interface to the acknowledged lease address */
AdamGreen	0:616601bde9fb	1566	dhcp_bind(netif);
AdamGreen	0:616601bde9fb	1567	#endif
AdamGreen	0:616601bde9fb	1568	}
AdamGreen	0:616601bde9fb	1569	/* already bound to the given lease address? */
AdamGreen	0:616601bde9fb	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
AdamGreen	0:616601bde9fb	1571	dhcp_bind(netif);
AdamGreen	0:616601bde9fb	1572	}
AdamGreen	0:616601bde9fb	1573	}
AdamGreen	0:616601bde9fb	1574	/* received a DHCP_NAK in appropriate state? */
AdamGreen	0:616601bde9fb	1575	else if ((msg_type == DHCP_NAK) &&
AdamGreen	0:616601bde9fb	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
AdamGreen	0:616601bde9fb	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
AdamGreen	0:616601bde9fb	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
AdamGreen	0:616601bde9fb	1579	dhcp_handle_nak(netif);
AdamGreen	0:616601bde9fb	1580	}
AdamGreen	0:616601bde9fb	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
AdamGreen	0:616601bde9fb	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
AdamGreen	0:616601bde9fb	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
AdamGreen	0:616601bde9fb	1584	dhcp->request_timeout = 0;
AdamGreen	0:616601bde9fb	1585	/* remember offered lease */
AdamGreen	0:616601bde9fb	1586	dhcp_handle_offer(netif);
AdamGreen	0:616601bde9fb	1587	}
AdamGreen	0:616601bde9fb	1588	free_pbuf_and_return:
AdamGreen	0:616601bde9fb	1589	dhcp->msg_in = NULL;
AdamGreen	0:616601bde9fb	1590	pbuf_free(p);
AdamGreen	0:616601bde9fb	1591	}
AdamGreen	0:616601bde9fb	1592
AdamGreen	0:616601bde9fb	1593	/**
AdamGreen	0:616601bde9fb	1594	* Create a DHCP request, fill in common headers
AdamGreen	0:616601bde9fb	1595	*
AdamGreen	0:616601bde9fb	1596	* @param netif the netif under DHCP control
AdamGreen	0:616601bde9fb	1597	* @param dhcp dhcp control struct
AdamGreen	0:616601bde9fb	1598	* @param message_type message type of the request
AdamGreen	0:616601bde9fb	1599	*/
AdamGreen	0:616601bde9fb	1600	static err_t
AdamGreen	0:616601bde9fb	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
AdamGreen	0:616601bde9fb	1602	{
AdamGreen	0:616601bde9fb	1603	u16_t i;
AdamGreen	0:616601bde9fb	1604	#ifndef DHCP_GLOBAL_XID
AdamGreen	0:616601bde9fb	1605	/** default global transaction identifier starting value (easy to match
AdamGreen	0:616601bde9fb	1606	* with a packet analyser). We simply increment for each new request.
AdamGreen	0:616601bde9fb	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
AdamGreen	0:616601bde9fb	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
AdamGreen	0:616601bde9fb	1609	static u32_t xid = 0xABCD0000;
AdamGreen	0:616601bde9fb	1610	#else
AdamGreen	0:616601bde9fb	1611	static u32_t xid;
AdamGreen	0:616601bde9fb	1612	static u8_t xid_initialised = 0;
AdamGreen	0:616601bde9fb	1613	if (!xid_initialised) {
AdamGreen	0:616601bde9fb	1614	xid = DHCP_GLOBAL_XID;
AdamGreen	0:616601bde9fb	1615	xid_initialised = !xid_initialised;
AdamGreen	0:616601bde9fb	1616	}
AdamGreen	0:616601bde9fb	1617	#endif
AdamGreen	0:616601bde9fb	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
AdamGreen	0:616601bde9fb	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
AdamGreen	0:616601bde9fb	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
AdamGreen	0:616601bde9fb	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
AdamGreen	0:616601bde9fb	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
AdamGreen	0:616601bde9fb	1623	if (dhcp->p_out == NULL) {
AdamGreen	0:616601bde9fb	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
AdamGreen	0:616601bde9fb	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
AdamGreen	0:616601bde9fb	1626	return ERR_MEM;
AdamGreen	0:616601bde9fb	1627	}
AdamGreen	0:616601bde9fb	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
AdamGreen	0:616601bde9fb	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
AdamGreen	0:616601bde9fb	1630
AdamGreen	0:616601bde9fb	1631	/* reuse transaction identifier in retransmissions */
AdamGreen	0:616601bde9fb	1632	if (dhcp->tries == 0) {
AdamGreen	0:616601bde9fb	1633	xid++;
AdamGreen	0:616601bde9fb	1634	}
AdamGreen	0:616601bde9fb	1635	dhcp->xid = xid;
AdamGreen	0:616601bde9fb	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
AdamGreen	0:616601bde9fb	1637	("transaction id xid(%"X32_F")\n", xid));
AdamGreen	0:616601bde9fb	1638
AdamGreen	0:616601bde9fb	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
AdamGreen	0:616601bde9fb	1640
AdamGreen	0:616601bde9fb	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
AdamGreen	0:616601bde9fb	1642	/* TODO: make link layer independent */
AdamGreen	0:616601bde9fb	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
AdamGreen	0:616601bde9fb	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
AdamGreen	0:616601bde9fb	1645	dhcp->msg_out->hops = 0;
AdamGreen	0:616601bde9fb	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
AdamGreen	0:616601bde9fb	1647	dhcp->msg_out->secs = 0;
AdamGreen	0:616601bde9fb	1648	/* we don't need the broadcast flag since we can receive unicast traffic
AdamGreen	0:616601bde9fb	1649	before being fully configured! */
AdamGreen	0:616601bde9fb	1650	dhcp->msg_out->flags = 0;
AdamGreen	0:616601bde9fb	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
AdamGreen	0:616601bde9fb	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
AdamGreen	0:616601bde9fb	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
AdamGreen	0:616601bde9fb	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
AdamGreen	0:616601bde9fb	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
AdamGreen	0:616601bde9fb	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
AdamGreen	0:616601bde9fb	1657	}
AdamGreen	0:616601bde9fb	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
AdamGreen	0:616601bde9fb	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
AdamGreen	0:616601bde9fb	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
AdamGreen	0:616601bde9fb	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
AdamGreen	0:616601bde9fb	1662	/* copy netif hardware address, pad with zeroes */
AdamGreen	0:616601bde9fb	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
AdamGreen	0:616601bde9fb	1664	}
AdamGreen	0:616601bde9fb	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
AdamGreen	0:616601bde9fb	1666	dhcp->msg_out->sname[i] = 0;
AdamGreen	0:616601bde9fb	1667	}
AdamGreen	0:616601bde9fb	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
AdamGreen	0:616601bde9fb	1669	dhcp->msg_out->file[i] = 0;
AdamGreen	0:616601bde9fb	1670	}
AdamGreen	0:616601bde9fb	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
AdamGreen	0:616601bde9fb	1672	dhcp->options_out_len = 0;
AdamGreen	0:616601bde9fb	1673	/* fill options field with an incrementing array (for debugging purposes) */
AdamGreen	0:616601bde9fb	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
AdamGreen	0:616601bde9fb	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
AdamGreen	0:616601bde9fb	1676	}
AdamGreen	0:616601bde9fb	1677	/* Add option MESSAGE_TYPE */
AdamGreen	0:616601bde9fb	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
AdamGreen	0:616601bde9fb	1679	dhcp_option_byte(dhcp, message_type);
AdamGreen	0:616601bde9fb	1680	return ERR_OK;
AdamGreen	0:616601bde9fb	1681	}
AdamGreen	0:616601bde9fb	1682
AdamGreen	0:616601bde9fb	1683	/**
AdamGreen	0:616601bde9fb	1684	* Free previously allocated memory used to send a DHCP request.
AdamGreen	0:616601bde9fb	1685	*
AdamGreen	0:616601bde9fb	1686	* @param dhcp the dhcp struct to free the request from
AdamGreen	0:616601bde9fb	1687	*/
AdamGreen	0:616601bde9fb	1688	static void
AdamGreen	0:616601bde9fb	1689	dhcp_delete_msg(struct dhcp *dhcp)
AdamGreen	0:616601bde9fb	1690	{
AdamGreen	0:616601bde9fb	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
AdamGreen	0:616601bde9fb	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
AdamGreen	0:616601bde9fb	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
AdamGreen	0:616601bde9fb	1694	if (dhcp->p_out != NULL) {
AdamGreen	0:616601bde9fb	1695	pbuf_free(dhcp->p_out);
AdamGreen	0:616601bde9fb	1696	}
AdamGreen	0:616601bde9fb	1697	dhcp->p_out = NULL;
AdamGreen	0:616601bde9fb	1698	dhcp->msg_out = NULL;
AdamGreen	0:616601bde9fb	1699	}
AdamGreen	0:616601bde9fb	1700
AdamGreen	0:616601bde9fb	1701	/**
AdamGreen	0:616601bde9fb	1702	* Add a DHCP message trailer
AdamGreen	0:616601bde9fb	1703	*
AdamGreen	0:616601bde9fb	1704	* Adds the END option to the DHCP message, and if
AdamGreen	0:616601bde9fb	1705	* necessary, up to three padding bytes.
AdamGreen	0:616601bde9fb	1706	*
AdamGreen	0:616601bde9fb	1707	* @param dhcp DHCP state structure
AdamGreen	0:616601bde9fb	1708	*/
AdamGreen	0:616601bde9fb	1709	static void
AdamGreen	0:616601bde9fb	1710	dhcp_option_trailer(struct dhcp *dhcp)
AdamGreen	0:616601bde9fb	1711	{
AdamGreen	0:616601bde9fb	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
AdamGreen	0:616601bde9fb	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
AdamGreen	0:616601bde9fb	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
AdamGreen	0:616601bde9fb	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
AdamGreen	0:616601bde9fb	1716	/* packet is too small, or not 4 byte aligned? */
AdamGreen	0:616601bde9fb	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
AdamGreen	0:616601bde9fb	1718	/* 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)); */
AdamGreen	0:616601bde9fb	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
AdamGreen	0:616601bde9fb	1720	/* add a fill/padding byte */
AdamGreen	0:616601bde9fb	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
AdamGreen	0:616601bde9fb	1722	}
AdamGreen	0:616601bde9fb	1723	}
AdamGreen	0:616601bde9fb	1724
AdamGreen	0:616601bde9fb	1725	#endif /* LWIP_DHCP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	23 Feb 2012
Imports:	113
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	4
Followers:	6

NetStack/lwip/core/dhcp.c@0:616601bde9fb, 2012-02-23 (annotated)

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