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lwip/core/dhcp.c@0:d616ece2d859, 2010-09-18 (annotated)

Committer:: mbed714
Date:: Sat Sep 18 23:05:49 2010 +0000
Revision:: 0:d616ece2d859

Who changed what in which revision?

User	Revision	Line number	New contents of line
mbed714	0:d616ece2d859	1	/**
mbed714	0:d616ece2d859	2	* @file
mbed714	0:d616ece2d859	3	* Dynamic Host Configuration Protocol client
mbed714	0:d616ece2d859	4	*
mbed714	0:d616ece2d859	5	*/
mbed714	0:d616ece2d859	6
mbed714	0:d616ece2d859	7	/*
mbed714	0:d616ece2d859	8	*
mbed714	0:d616ece2d859	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
mbed714	0:d616ece2d859	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
mbed714	0:d616ece2d859	11	* All rights reserved.
mbed714	0:d616ece2d859	12	*
mbed714	0:d616ece2d859	13	* Redistribution and use in source and binary forms, with or without modification,
mbed714	0:d616ece2d859	14	* are permitted provided that the following conditions are met:
mbed714	0:d616ece2d859	15	*
mbed714	0:d616ece2d859	16	* 1. Redistributions of source code must retain the above copyright notice,
mbed714	0:d616ece2d859	17	* this list of conditions and the following disclaimer.
mbed714	0:d616ece2d859	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed714	0:d616ece2d859	19	* this list of conditions and the following disclaimer in the documentation
mbed714	0:d616ece2d859	20	* and/or other materials provided with the distribution.
mbed714	0:d616ece2d859	21	* 3. The name of the author may not be used to endorse or promote products
mbed714	0:d616ece2d859	22	* derived from this software without specific prior written permission.
mbed714	0:d616ece2d859	23	*
mbed714	0:d616ece2d859	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed714	0:d616ece2d859	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed714	0:d616ece2d859	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed714	0:d616ece2d859	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed714	0:d616ece2d859	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed714	0:d616ece2d859	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed714	0:d616ece2d859	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed714	0:d616ece2d859	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed714	0:d616ece2d859	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed714	0:d616ece2d859	33	* OF SUCH DAMAGE.
mbed714	0:d616ece2d859	34	*
mbed714	0:d616ece2d859	35	* This file is a contribution to the lwIP TCP/IP stack.
mbed714	0:d616ece2d859	36	* The Swedish Institute of Computer Science and Adam Dunkels
mbed714	0:d616ece2d859	37	* are specifically granted permission to redistribute this
mbed714	0:d616ece2d859	38	* source code.
mbed714	0:d616ece2d859	39	*
mbed714	0:d616ece2d859	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
mbed714	0:d616ece2d859	41	*
mbed714	0:d616ece2d859	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
mbed714	0:d616ece2d859	43	* with RFC 2131 and RFC 2132.
mbed714	0:d616ece2d859	44	*
mbed714	0:d616ece2d859	45	* TODO:
mbed714	0:d616ece2d859	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
mbed714	0:d616ece2d859	47	*
mbed714	0:d616ece2d859	48	* Please coordinate changes and requests with Leon Woestenberg
mbed714	0:d616ece2d859	49	* <leon.woestenberg@gmx.net>
mbed714	0:d616ece2d859	50	*
mbed714	0:d616ece2d859	51	* Integration with your code:
mbed714	0:d616ece2d859	52	*
mbed714	0:d616ece2d859	53	* In lwip/dhcp.h
mbed714	0:d616ece2d859	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
mbed714	0:d616ece2d859	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
mbed714	0:d616ece2d859	56	*
mbed714	0:d616ece2d859	57	* Then have your application call dhcp_coarse_tmr() and
mbed714	0:d616ece2d859	58	* dhcp_fine_tmr() on the defined intervals.
mbed714	0:d616ece2d859	59	*
mbed714	0:d616ece2d859	60	* dhcp_start(struct netif *netif);
mbed714	0:d616ece2d859	61	* starts a DHCP client instance which configures the interface by
mbed714	0:d616ece2d859	62	* obtaining an IP address lease and maintaining it.
mbed714	0:d616ece2d859	63	*
mbed714	0:d616ece2d859	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
mbed714	0:d616ece2d859	65	* to remove the DHCP client.
mbed714	0:d616ece2d859	66	*
mbed714	0:d616ece2d859	67	*/
mbed714	0:d616ece2d859	68
mbed714	0:d616ece2d859	69	#include "lwip/opt.h"
mbed714	0:d616ece2d859	70
mbed714	0:d616ece2d859	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
mbed714	0:d616ece2d859	72
mbed714	0:d616ece2d859	73	#include "lwip/stats.h"
mbed714	0:d616ece2d859	74	#include "lwip/mem.h"
mbed714	0:d616ece2d859	75	#include "lwip/udp.h"
mbed714	0:d616ece2d859	76	#include "lwip/ip_addr.h"
mbed714	0:d616ece2d859	77	#include "lwip/netif.h"
mbed714	0:d616ece2d859	78	#include "lwip/def.h"
mbed714	0:d616ece2d859	79	#include "lwip/sys.h"
mbed714	0:d616ece2d859	80	#include "lwip/dhcp.h"
mbed714	0:d616ece2d859	81	#include "lwip/autoip.h"
mbed714	0:d616ece2d859	82	#include "lwip/dns.h"
mbed714	0:d616ece2d859	83	#include "netif/etharp.h"
mbed714	0:d616ece2d859	84
mbed714	0:d616ece2d859	85	#include <string.h>
mbed714	0:d616ece2d859	86
mbed714	0:d616ece2d859	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
mbed714	0:d616ece2d859	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
mbed714	0:d616ece2d859	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
mbed714	0:d616ece2d859	90	* #define DHCP_GLOBAL_XID rand()
mbed714	0:d616ece2d859	91	*/
mbed714	0:d616ece2d859	92	#ifdef DHCP_GLOBAL_XID_HEADER
mbed714	0:d616ece2d859	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
mbed714	0:d616ece2d859	94	#endif
mbed714	0:d616ece2d859	95
mbed714	0:d616ece2d859	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
mbed714	0:d616ece2d859	97	* MTU is checked to be big enough in dhcp_start */
mbed714	0:d616ece2d859	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
mbed714	0:d616ece2d859	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
mbed714	0:d616ece2d859	100	/** Minimum length for reply before packet is parsed */
mbed714	0:d616ece2d859	101	#define DHCP_MIN_REPLY_LEN 44
mbed714	0:d616ece2d859	102
mbed714	0:d616ece2d859	103	#define REBOOT_TRIES 2
mbed714	0:d616ece2d859	104
mbed714	0:d616ece2d859	105	/** Option handling: options are parsed in dhcp_parse_reply
mbed714	0:d616ece2d859	106	* and saved in an array where other functions can load them from.
mbed714	0:d616ece2d859	107	* This might be moved into the struct dhcp (not necessarily since
mbed714	0:d616ece2d859	108	* lwIP is single-threaded and the array is only used while in recv
mbed714	0:d616ece2d859	109	* callback). */
mbed714	0:d616ece2d859	110	#define DHCP_OPTION_IDX_OVERLOAD 0
mbed714	0:d616ece2d859	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
mbed714	0:d616ece2d859	112	#define DHCP_OPTION_IDX_SERVER_ID 2
mbed714	0:d616ece2d859	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
mbed714	0:d616ece2d859	114	#define DHCP_OPTION_IDX_T1 4
mbed714	0:d616ece2d859	115	#define DHCP_OPTION_IDX_T2 5
mbed714	0:d616ece2d859	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
mbed714	0:d616ece2d859	117	#define DHCP_OPTION_IDX_ROUTER 7
mbed714	0:d616ece2d859	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
mbed714	0:d616ece2d859	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
mbed714	0:d616ece2d859	120
mbed714	0:d616ece2d859	121	/** Holds the decoded option values, only valid while in dhcp_recv.
mbed714	0:d616ece2d859	122	@todo: move this into struct dhcp? */
mbed714	0:d616ece2d859	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
mbed714	0:d616ece2d859	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
mbed714	0:d616ece2d859	125	only valid while in dhcp_recv.
mbed714	0:d616ece2d859	126	@todo: move this into struct dhcp? */
mbed714	0:d616ece2d859	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
mbed714	0:d616ece2d859	128
mbed714	0:d616ece2d859	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
mbed714	0:d616ece2d859	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
mbed714	0:d616ece2d859	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
mbed714	0:d616ece2d859	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
mbed714	0:d616ece2d859	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
mbed714	0:d616ece2d859	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
mbed714	0:d616ece2d859	135
mbed714	0:d616ece2d859	136
mbed714	0:d616ece2d859	137	/* DHCP client state machine functions */
mbed714	0:d616ece2d859	138	static err_t dhcp_discover(struct netif *netif);
mbed714	0:d616ece2d859	139	static err_t dhcp_select(struct netif *netif);
mbed714	0:d616ece2d859	140	static void dhcp_bind(struct netif *netif);
mbed714	0:d616ece2d859	141	#if DHCP_DOES_ARP_CHECK
mbed714	0:d616ece2d859	142	static err_t dhcp_decline(struct netif *netif);
mbed714	0:d616ece2d859	143	#endif /* DHCP_DOES_ARP_CHECK */
mbed714	0:d616ece2d859	144	static err_t dhcp_rebind(struct netif *netif);
mbed714	0:d616ece2d859	145	static err_t dhcp_reboot(struct netif *netif);
mbed714	0:d616ece2d859	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
mbed714	0:d616ece2d859	147
mbed714	0:d616ece2d859	148	/* receive, unfold, parse and free incoming messages */
mbed714	0:d616ece2d859	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
mbed714	0:d616ece2d859	150
mbed714	0:d616ece2d859	151	/* set the DHCP timers */
mbed714	0:d616ece2d859	152	static void dhcp_timeout(struct netif *netif);
mbed714	0:d616ece2d859	153	static void dhcp_t1_timeout(struct netif *netif);
mbed714	0:d616ece2d859	154	static void dhcp_t2_timeout(struct netif *netif);
mbed714	0:d616ece2d859	155
mbed714	0:d616ece2d859	156	/* build outgoing messages */
mbed714	0:d616ece2d859	157	/* create a DHCP message, fill in common headers */
mbed714	0:d616ece2d859	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
mbed714	0:d616ece2d859	159	/* free a DHCP request */
mbed714	0:d616ece2d859	160	static void dhcp_delete_msg(struct dhcp *dhcp);
mbed714	0:d616ece2d859	161	/* add a DHCP option (type, then length in bytes) */
mbed714	0:d616ece2d859	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
mbed714	0:d616ece2d859	163	/* add option values */
mbed714	0:d616ece2d859	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
mbed714	0:d616ece2d859	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
mbed714	0:d616ece2d859	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
mbed714	0:d616ece2d859	167	/* always add the DHCP options trailer to end and pad */
mbed714	0:d616ece2d859	168	static void dhcp_option_trailer(struct dhcp *dhcp);
mbed714	0:d616ece2d859	169
mbed714	0:d616ece2d859	170	/**
mbed714	0:d616ece2d859	171	* Back-off the DHCP client (because of a received NAK response).
mbed714	0:d616ece2d859	172	*
mbed714	0:d616ece2d859	173	* Back-off the DHCP client because of a received NAK. Receiving a
mbed714	0:d616ece2d859	174	* NAK means the client asked for something non-sensible, for
mbed714	0:d616ece2d859	175	* example when it tries to renew a lease obtained on another network.
mbed714	0:d616ece2d859	176	*
mbed714	0:d616ece2d859	177	* We clear any existing set IP address and restart DHCP negotiation
mbed714	0:d616ece2d859	178	* afresh (as per RFC2131 3.2.3).
mbed714	0:d616ece2d859	179	*
mbed714	0:d616ece2d859	180	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	181	*/
mbed714	0:d616ece2d859	182	static void
mbed714	0:d616ece2d859	183	dhcp_handle_nak(struct netif *netif)
mbed714	0:d616ece2d859	184	{
mbed714	0:d616ece2d859	185	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
mbed714	0:d616ece2d859	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
mbed714	0:d616ece2d859	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
mbed714	0:d616ece2d859	189	netif_set_down(netif);
mbed714	0:d616ece2d859	190	/* remove IP address from interface */
mbed714	0:d616ece2d859	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
mbed714	0:d616ece2d859	192	netif_set_gw(netif, IP_ADDR_ANY);
mbed714	0:d616ece2d859	193	netif_set_netmask(netif, IP_ADDR_ANY);
mbed714	0:d616ece2d859	194	/* Change to a defined state */
mbed714	0:d616ece2d859	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
mbed714	0:d616ece2d859	196	/* We can immediately restart discovery */
mbed714	0:d616ece2d859	197	dhcp_discover(netif);
mbed714	0:d616ece2d859	198	}
mbed714	0:d616ece2d859	199
mbed714	0:d616ece2d859	200	#if DHCP_DOES_ARP_CHECK
mbed714	0:d616ece2d859	201	/**
mbed714	0:d616ece2d859	202	* Checks if the offered IP address is already in use.
mbed714	0:d616ece2d859	203	*
mbed714	0:d616ece2d859	204	* It does so by sending an ARP request for the offered address and
mbed714	0:d616ece2d859	205	* entering CHECKING state. If no ARP reply is received within a small
mbed714	0:d616ece2d859	206	* interval, the address is assumed to be free for use by us.
mbed714	0:d616ece2d859	207	*
mbed714	0:d616ece2d859	208	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	209	*/
mbed714	0:d616ece2d859	210	static void
mbed714	0:d616ece2d859	211	dhcp_check(struct netif *netif)
mbed714	0:d616ece2d859	212	{
mbed714	0:d616ece2d859	213	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	214	err_t result;
mbed714	0:d616ece2d859	215	u16_t msecs;
mbed714	0:d616ece2d859	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
mbed714	0:d616ece2d859	217	(s16_t)netif->name[1]));
mbed714	0:d616ece2d859	218	dhcp_set_state(dhcp, DHCP_CHECKING);
mbed714	0:d616ece2d859	219	/* create an ARP query for the offered IP address, expecting that no host
mbed714	0:d616ece2d859	220	responds, as the IP address should not be in use. */
mbed714	0:d616ece2d859	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
mbed714	0:d616ece2d859	222	if (result != ERR_OK) {
mbed714	0:d616ece2d859	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
mbed714	0:d616ece2d859	224	}
mbed714	0:d616ece2d859	225	dhcp->tries++;
mbed714	0:d616ece2d859	226	msecs = 500;
mbed714	0:d616ece2d859	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	229	}
mbed714	0:d616ece2d859	230	#endif /* DHCP_DOES_ARP_CHECK */
mbed714	0:d616ece2d859	231
mbed714	0:d616ece2d859	232	/**
mbed714	0:d616ece2d859	233	* Remember the configuration offered by a DHCP server.
mbed714	0:d616ece2d859	234	*
mbed714	0:d616ece2d859	235	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	236	*/
mbed714	0:d616ece2d859	237	static void
mbed714	0:d616ece2d859	238	dhcp_handle_offer(struct netif *netif)
mbed714	0:d616ece2d859	239	{
mbed714	0:d616ece2d859	240	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
mbed714	0:d616ece2d859	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
mbed714	0:d616ece2d859	243	/* obtain the server address */
mbed714	0:d616ece2d859	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
mbed714	0:d616ece2d859	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
mbed714	0:d616ece2d859	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
mbed714	0:d616ece2d859	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
mbed714	0:d616ece2d859	248	/* remember offered address */
mbed714	0:d616ece2d859	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
mbed714	0:d616ece2d859	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
mbed714	0:d616ece2d859	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
mbed714	0:d616ece2d859	252
mbed714	0:d616ece2d859	253	dhcp_select(netif);
mbed714	0:d616ece2d859	254	} else {
mbed714	0:d616ece2d859	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
mbed714	0:d616ece2d859	257	}
mbed714	0:d616ece2d859	258	}
mbed714	0:d616ece2d859	259
mbed714	0:d616ece2d859	260	/**
mbed714	0:d616ece2d859	261	* Select a DHCP server offer out of all offers.
mbed714	0:d616ece2d859	262	*
mbed714	0:d616ece2d859	263	* Simply select the first offer received.
mbed714	0:d616ece2d859	264	*
mbed714	0:d616ece2d859	265	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	266	* @return lwIP specific error (see error.h)
mbed714	0:d616ece2d859	267	*/
mbed714	0:d616ece2d859	268	static err_t
mbed714	0:d616ece2d859	269	dhcp_select(struct netif *netif)
mbed714	0:d616ece2d859	270	{
mbed714	0:d616ece2d859	271	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	272	err_t result;
mbed714	0:d616ece2d859	273	u16_t msecs;
mbed714	0:d616ece2d859	274
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
mbed714	0:d616ece2d859	277
mbed714	0:d616ece2d859	278	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
mbed714	0:d616ece2d859	280	if (result == ERR_OK) {
mbed714	0:d616ece2d859	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
mbed714	0:d616ece2d859	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
mbed714	0:d616ece2d859	283
mbed714	0:d616ece2d859	284	/* MUST request the offered IP address */
mbed714	0:d616ece2d859	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
mbed714	0:d616ece2d859	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
mbed714	0:d616ece2d859	287
mbed714	0:d616ece2d859	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
mbed714	0:d616ece2d859	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
mbed714	0:d616ece2d859	290
mbed714	0:d616ece2d859	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
mbed714	0:d616ece2d859	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
mbed714	0:d616ece2d859	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
mbed714	0:d616ece2d859	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
mbed714	0:d616ece2d859	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
mbed714	0:d616ece2d859	296
mbed714	0:d616ece2d859	297	#if LWIP_NETIF_HOSTNAME
mbed714	0:d616ece2d859	298	if (netif->hostname != NULL) {
mbed714	0:d616ece2d859	299	const char p = (const char)netif->hostname;
mbed714	0:d616ece2d859	300	u8_t namelen = (u8_t)strlen(p);
mbed714	0:d616ece2d859	301	if (namelen > 0) {
mbed714	0:d616ece2d859	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
mbed714	0:d616ece2d859	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
mbed714	0:d616ece2d859	304	while (*p) {
mbed714	0:d616ece2d859	305	dhcp_option_byte(dhcp, *p++);
mbed714	0:d616ece2d859	306	}
mbed714	0:d616ece2d859	307	}
mbed714	0:d616ece2d859	308	}
mbed714	0:d616ece2d859	309	#endif /* LWIP_NETIF_HOSTNAME */
mbed714	0:d616ece2d859	310
mbed714	0:d616ece2d859	311	dhcp_option_trailer(dhcp);
mbed714	0:d616ece2d859	312	/* shrink the pbuf to the actual content length */
mbed714	0:d616ece2d859	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
mbed714	0:d616ece2d859	314
mbed714	0:d616ece2d859	315	/* send broadcast to any DHCP server */
mbed714	0:d616ece2d859	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	317	dhcp_delete_msg(dhcp);
mbed714	0:d616ece2d859	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
mbed714	0:d616ece2d859	319	} else {
mbed714	0:d616ece2d859	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	321	}
mbed714	0:d616ece2d859	322	dhcp->tries++;
mbed714	0:d616ece2d859	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
mbed714	0:d616ece2d859	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	326	return result;
mbed714	0:d616ece2d859	327	}
mbed714	0:d616ece2d859	328
mbed714	0:d616ece2d859	329	/**
mbed714	0:d616ece2d859	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
mbed714	0:d616ece2d859	331	*/
mbed714	0:d616ece2d859	332	void
mbed714	0:d616ece2d859	333	dhcp_coarse_tmr()
mbed714	0:d616ece2d859	334	{
mbed714	0:d616ece2d859	335	struct netif *netif = netif_list;
mbed714	0:d616ece2d859	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
mbed714	0:d616ece2d859	337	/* iterate through all network interfaces */
mbed714	0:d616ece2d859	338	while (netif != NULL) {
mbed714	0:d616ece2d859	339	/* only act on DHCP configured interfaces */
mbed714	0:d616ece2d859	340	if (netif->dhcp != NULL) {
mbed714	0:d616ece2d859	341	/* timer is active (non zero), and triggers (zeroes) now? */
mbed714	0:d616ece2d859	342	if (netif->dhcp->t2_timeout-- == 1) {
mbed714	0:d616ece2d859	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
mbed714	0:d616ece2d859	344	/* this clients' rebind timeout triggered */
mbed714	0:d616ece2d859	345	dhcp_t2_timeout(netif);
mbed714	0:d616ece2d859	346	/* timer is active (non zero), and triggers (zeroes) now */
mbed714	0:d616ece2d859	347	} else if (netif->dhcp->t1_timeout-- == 1) {
mbed714	0:d616ece2d859	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
mbed714	0:d616ece2d859	349	/* this clients' renewal timeout triggered */
mbed714	0:d616ece2d859	350	dhcp_t1_timeout(netif);
mbed714	0:d616ece2d859	351	}
mbed714	0:d616ece2d859	352	}
mbed714	0:d616ece2d859	353	/* proceed to next netif */
mbed714	0:d616ece2d859	354	netif = netif->next;
mbed714	0:d616ece2d859	355	}
mbed714	0:d616ece2d859	356	}
mbed714	0:d616ece2d859	357
mbed714	0:d616ece2d859	358	/**
mbed714	0:d616ece2d859	359	* DHCP transaction timeout handling
mbed714	0:d616ece2d859	360	*
mbed714	0:d616ece2d859	361	* A DHCP server is expected to respond within a short period of time.
mbed714	0:d616ece2d859	362	* This timer checks whether an outstanding DHCP request is timed out.
mbed714	0:d616ece2d859	363	*/
mbed714	0:d616ece2d859	364	void
mbed714	0:d616ece2d859	365	dhcp_fine_tmr()
mbed714	0:d616ece2d859	366	{
mbed714	0:d616ece2d859	367	struct netif *netif = netif_list;
mbed714	0:d616ece2d859	368	/* loop through netif's */
mbed714	0:d616ece2d859	369	while (netif != NULL) {
mbed714	0:d616ece2d859	370	/* only act on DHCP configured interfaces */
mbed714	0:d616ece2d859	371	if (netif->dhcp != NULL) {
mbed714	0:d616ece2d859	372	/* timer is active (non zero), and is about to trigger now */
mbed714	0:d616ece2d859	373	if (netif->dhcp->request_timeout > 1) {
mbed714	0:d616ece2d859	374	netif->dhcp->request_timeout--;
mbed714	0:d616ece2d859	375	}
mbed714	0:d616ece2d859	376	else if (netif->dhcp->request_timeout == 1) {
mbed714	0:d616ece2d859	377	netif->dhcp->request_timeout--;
mbed714	0:d616ece2d859	378	/* { netif->dhcp->request_timeout == 0 } */
mbed714	0:d616ece2d859	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
mbed714	0:d616ece2d859	380	/* this client's request timeout triggered */
mbed714	0:d616ece2d859	381	dhcp_timeout(netif);
mbed714	0:d616ece2d859	382	}
mbed714	0:d616ece2d859	383	}
mbed714	0:d616ece2d859	384	/* proceed to next network interface */
mbed714	0:d616ece2d859	385	netif = netif->next;
mbed714	0:d616ece2d859	386	}
mbed714	0:d616ece2d859	387	}
mbed714	0:d616ece2d859	388
mbed714	0:d616ece2d859	389	/**
mbed714	0:d616ece2d859	390	* A DHCP negotiation transaction, or ARP request, has timed out.
mbed714	0:d616ece2d859	391	*
mbed714	0:d616ece2d859	392	* The timer that was started with the DHCP or ARP request has
mbed714	0:d616ece2d859	393	* timed out, indicating no response was received in time.
mbed714	0:d616ece2d859	394	*
mbed714	0:d616ece2d859	395	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	396	*/
mbed714	0:d616ece2d859	397	static void
mbed714	0:d616ece2d859	398	dhcp_timeout(struct netif *netif)
mbed714	0:d616ece2d859	399	{
mbed714	0:d616ece2d859	400	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
mbed714	0:d616ece2d859	402	/* back-off period has passed, or server selection timed out */
mbed714	0:d616ece2d859	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
mbed714	0:d616ece2d859	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
mbed714	0:d616ece2d859	405	dhcp_discover(netif);
mbed714	0:d616ece2d859	406	/* receiving the requested lease timed out */
mbed714	0:d616ece2d859	407	} else if (dhcp->state == DHCP_REQUESTING) {
mbed714	0:d616ece2d859	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
mbed714	0:d616ece2d859	409	if (dhcp->tries <= 5) {
mbed714	0:d616ece2d859	410	dhcp_select(netif);
mbed714	0:d616ece2d859	411	} else {
mbed714	0:d616ece2d859	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
mbed714	0:d616ece2d859	413	dhcp_release(netif);
mbed714	0:d616ece2d859	414	dhcp_discover(netif);
mbed714	0:d616ece2d859	415	}
mbed714	0:d616ece2d859	416	#if DHCP_DOES_ARP_CHECK
mbed714	0:d616ece2d859	417	/* received no ARP reply for the offered address (which is good) */
mbed714	0:d616ece2d859	418	} else if (dhcp->state == DHCP_CHECKING) {
mbed714	0:d616ece2d859	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
mbed714	0:d616ece2d859	420	if (dhcp->tries <= 1) {
mbed714	0:d616ece2d859	421	dhcp_check(netif);
mbed714	0:d616ece2d859	422	/* no ARP replies on the offered address,
mbed714	0:d616ece2d859	423	looks like the IP address is indeed free */
mbed714	0:d616ece2d859	424	} else {
mbed714	0:d616ece2d859	425	/* bind the interface to the offered address */
mbed714	0:d616ece2d859	426	dhcp_bind(netif);
mbed714	0:d616ece2d859	427	}
mbed714	0:d616ece2d859	428	#endif /* DHCP_DOES_ARP_CHECK */
mbed714	0:d616ece2d859	429	}
mbed714	0:d616ece2d859	430	/* did not get response to renew request? */
mbed714	0:d616ece2d859	431	else if (dhcp->state == DHCP_RENEWING) {
mbed714	0:d616ece2d859	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
mbed714	0:d616ece2d859	433	/* just retry renewal */
mbed714	0:d616ece2d859	434	/* note that the rebind timer will eventually time-out if renew does not work */
mbed714	0:d616ece2d859	435	dhcp_renew(netif);
mbed714	0:d616ece2d859	436	/* did not get response to rebind request? */
mbed714	0:d616ece2d859	437	} else if (dhcp->state == DHCP_REBINDING) {
mbed714	0:d616ece2d859	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
mbed714	0:d616ece2d859	439	if (dhcp->tries <= 8) {
mbed714	0:d616ece2d859	440	dhcp_rebind(netif);
mbed714	0:d616ece2d859	441	} else {
mbed714	0:d616ece2d859	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
mbed714	0:d616ece2d859	443	dhcp_release(netif);
mbed714	0:d616ece2d859	444	dhcp_discover(netif);
mbed714	0:d616ece2d859	445	}
mbed714	0:d616ece2d859	446	} else if (dhcp->state == DHCP_REBOOTING) {
mbed714	0:d616ece2d859	447	if (dhcp->tries < REBOOT_TRIES) {
mbed714	0:d616ece2d859	448	dhcp_reboot(netif);
mbed714	0:d616ece2d859	449	} else {
mbed714	0:d616ece2d859	450	dhcp_discover(netif);
mbed714	0:d616ece2d859	451	}
mbed714	0:d616ece2d859	452	}
mbed714	0:d616ece2d859	453	}
mbed714	0:d616ece2d859	454
mbed714	0:d616ece2d859	455	/**
mbed714	0:d616ece2d859	456	* The renewal period has timed out.
mbed714	0:d616ece2d859	457	*
mbed714	0:d616ece2d859	458	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	459	*/
mbed714	0:d616ece2d859	460	static void
mbed714	0:d616ece2d859	461	dhcp_t1_timeout(struct netif *netif)
mbed714	0:d616ece2d859	462	{
mbed714	0:d616ece2d859	463	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
mbed714	0:d616ece2d859	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
mbed714	0:d616ece2d859	466	(dhcp->state == DHCP_RENEWING)) {
mbed714	0:d616ece2d859	467	/* just retry to renew - note that the rebind timer (t2) will
mbed714	0:d616ece2d859	468	* eventually time-out if renew tries fail. */
mbed714	0:d616ece2d859	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
mbed714	0:d616ece2d859	470	("dhcp_t1_timeout(): must renew\n"));
mbed714	0:d616ece2d859	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
mbed714	0:d616ece2d859	472	DHCP_RENEWING, not DHCP_BOUND */
mbed714	0:d616ece2d859	473	dhcp_renew(netif);
mbed714	0:d616ece2d859	474	}
mbed714	0:d616ece2d859	475	}
mbed714	0:d616ece2d859	476
mbed714	0:d616ece2d859	477	/**
mbed714	0:d616ece2d859	478	* The rebind period has timed out.
mbed714	0:d616ece2d859	479	*
mbed714	0:d616ece2d859	480	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	481	*/
mbed714	0:d616ece2d859	482	static void
mbed714	0:d616ece2d859	483	dhcp_t2_timeout(struct netif *netif)
mbed714	0:d616ece2d859	484	{
mbed714	0:d616ece2d859	485	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
mbed714	0:d616ece2d859	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
mbed714	0:d616ece2d859	488	(dhcp->state == DHCP_RENEWING)) {
mbed714	0:d616ece2d859	489	/* just retry to rebind */
mbed714	0:d616ece2d859	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
mbed714	0:d616ece2d859	491	("dhcp_t2_timeout(): must rebind\n"));
mbed714	0:d616ece2d859	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
mbed714	0:d616ece2d859	493	DHCP_REBINDING, not DHCP_BOUND */
mbed714	0:d616ece2d859	494	dhcp_rebind(netif);
mbed714	0:d616ece2d859	495	}
mbed714	0:d616ece2d859	496	}
mbed714	0:d616ece2d859	497
mbed714	0:d616ece2d859	498	/**
mbed714	0:d616ece2d859	499	* Handle a DHCP ACK packet
mbed714	0:d616ece2d859	500	*
mbed714	0:d616ece2d859	501	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	502	*/
mbed714	0:d616ece2d859	503	static void
mbed714	0:d616ece2d859	504	dhcp_handle_ack(struct netif *netif)
mbed714	0:d616ece2d859	505	{
mbed714	0:d616ece2d859	506	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	507	#if LWIP_DNS
mbed714	0:d616ece2d859	508	u8_t n;
mbed714	0:d616ece2d859	509	#endif /* LWIP_DNS */
mbed714	0:d616ece2d859	510
mbed714	0:d616ece2d859	511	/* clear options we might not get from the ACK */
mbed714	0:d616ece2d859	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
mbed714	0:d616ece2d859	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
mbed714	0:d616ece2d859	514	#if LWIP_DHCP_BOOTP_FILE
mbed714	0:d616ece2d859	515	ip_addr_set_zero(&dhcp->offered_si_addr);
mbed714	0:d616ece2d859	516	#endif /* LWIP_DHCP_BOOTP_FILE */
mbed714	0:d616ece2d859	517
mbed714	0:d616ece2d859	518	/* lease time given? */
mbed714	0:d616ece2d859	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
mbed714	0:d616ece2d859	520	/* remember offered lease time */
mbed714	0:d616ece2d859	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
mbed714	0:d616ece2d859	522	}
mbed714	0:d616ece2d859	523	/* renewal period given? */
mbed714	0:d616ece2d859	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
mbed714	0:d616ece2d859	525	/* remember given renewal period */
mbed714	0:d616ece2d859	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
mbed714	0:d616ece2d859	527	} else {
mbed714	0:d616ece2d859	528	/* calculate safe periods for renewal */
mbed714	0:d616ece2d859	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
mbed714	0:d616ece2d859	530	}
mbed714	0:d616ece2d859	531
mbed714	0:d616ece2d859	532	/* renewal period given? */
mbed714	0:d616ece2d859	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
mbed714	0:d616ece2d859	534	/* remember given rebind period */
mbed714	0:d616ece2d859	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
mbed714	0:d616ece2d859	536	} else {
mbed714	0:d616ece2d859	537	/* calculate safe periods for rebinding */
mbed714	0:d616ece2d859	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
mbed714	0:d616ece2d859	539	}
mbed714	0:d616ece2d859	540
mbed714	0:d616ece2d859	541	/* (y)our internet address */
mbed714	0:d616ece2d859	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
mbed714	0:d616ece2d859	543
mbed714	0:d616ece2d859	544	#if LWIP_DHCP_BOOTP_FILE
mbed714	0:d616ece2d859	545	/* copy boot server address,
mbed714	0:d616ece2d859	546	boot file name copied in dhcp_parse_reply if not overloaded */
mbed714	0:d616ece2d859	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
mbed714	0:d616ece2d859	548	#endif /* LWIP_DHCP_BOOTP_FILE */
mbed714	0:d616ece2d859	549
mbed714	0:d616ece2d859	550	/* subnet mask given? */
mbed714	0:d616ece2d859	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
mbed714	0:d616ece2d859	552	/* remember given subnet mask */
mbed714	0:d616ece2d859	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
mbed714	0:d616ece2d859	554	dhcp->subnet_mask_given = 1;
mbed714	0:d616ece2d859	555	} else {
mbed714	0:d616ece2d859	556	dhcp->subnet_mask_given = 0;
mbed714	0:d616ece2d859	557	}
mbed714	0:d616ece2d859	558
mbed714	0:d616ece2d859	559	/* gateway router */
mbed714	0:d616ece2d859	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
mbed714	0:d616ece2d859	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
mbed714	0:d616ece2d859	562	}
mbed714	0:d616ece2d859	563
mbed714	0:d616ece2d859	564	#if LWIP_DNS
mbed714	0:d616ece2d859	565	/* DNS servers */
mbed714	0:d616ece2d859	566	n = 0;
mbed714	0:d616ece2d859	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
mbed714	0:d616ece2d859	568	ip_addr_t dns_addr;
mbed714	0:d616ece2d859	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
mbed714	0:d616ece2d859	570	dns_setserver(n, &dns_addr);
mbed714	0:d616ece2d859	571	n++;
mbed714	0:d616ece2d859	572	}
mbed714	0:d616ece2d859	573	#endif /* LWIP_DNS */
mbed714	0:d616ece2d859	574	}
mbed714	0:d616ece2d859	575
mbed714	0:d616ece2d859	576	/** Set a statically allocated struct dhcp to work with.
mbed714	0:d616ece2d859	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
mbed714	0:d616ece2d859	578	*
mbed714	0:d616ece2d859	579	* @param netif the netif for which to set the struct dhcp
mbed714	0:d616ece2d859	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
mbed714	0:d616ece2d859	581	*/
mbed714	0:d616ece2d859	582	void
mbed714	0:d616ece2d859	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
mbed714	0:d616ece2d859	584	{
mbed714	0:d616ece2d859	585	LWIP_ASSERT("netif != NULL", netif != NULL);
mbed714	0:d616ece2d859	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
mbed714	0:d616ece2d859	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
mbed714	0:d616ece2d859	588
mbed714	0:d616ece2d859	589	/* clear data structure */
mbed714	0:d616ece2d859	590	memset(dhcp, 0, sizeof(struct dhcp));
mbed714	0:d616ece2d859	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
mbed714	0:d616ece2d859	592	netif->dhcp = dhcp;
mbed714	0:d616ece2d859	593	}
mbed714	0:d616ece2d859	594
mbed714	0:d616ece2d859	595	/**
mbed714	0:d616ece2d859	596	* Start DHCP negotiation for a network interface.
mbed714	0:d616ece2d859	597	*
mbed714	0:d616ece2d859	598	* If no DHCP client instance was attached to this interface,
mbed714	0:d616ece2d859	599	* a new client is created first. If a DHCP client instance
mbed714	0:d616ece2d859	600	* was already present, it restarts negotiation.
mbed714	0:d616ece2d859	601	*
mbed714	0:d616ece2d859	602	* @param netif The lwIP network interface
mbed714	0:d616ece2d859	603	* @return lwIP error code
mbed714	0:d616ece2d859	604	* - ERR_OK - No error
mbed714	0:d616ece2d859	605	* - ERR_MEM - Out of memory
mbed714	0:d616ece2d859	606	*/
mbed714	0:d616ece2d859	607	err_t
mbed714	0:d616ece2d859	608	dhcp_start(struct netif *netif)
mbed714	0:d616ece2d859	609	{
mbed714	0:d616ece2d859	610	struct dhcp *dhcp;
mbed714	0:d616ece2d859	611	err_t result = ERR_OK;
mbed714	0:d616ece2d859	612
mbed714	0:d616ece2d859	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
mbed714	0:d616ece2d859	614	dhcp = netif->dhcp;
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	616	/* Remove the flag that says this netif is handled by DHCP,
mbed714	0:d616ece2d859	617	it is set when we succeeded starting. */
mbed714	0:d616ece2d859	618	netif->flags &= ~NETIF_FLAG_DHCP;
mbed714	0:d616ece2d859	619
mbed714	0:d616ece2d859	620	/* check hwtype of the netif */
mbed714	0:d616ece2d859	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
mbed714	0:d616ece2d859	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
mbed714	0:d616ece2d859	623	return ERR_ARG;
mbed714	0:d616ece2d859	624	}
mbed714	0:d616ece2d859	625
mbed714	0:d616ece2d859	626	/* check MTU of the netif */
mbed714	0:d616ece2d859	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
mbed714	0:d616ece2d859	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
mbed714	0:d616ece2d859	629	return ERR_MEM;
mbed714	0:d616ece2d859	630	}
mbed714	0:d616ece2d859	631
mbed714	0:d616ece2d859	632	/* no DHCP client attached yet? */
mbed714	0:d616ece2d859	633	if (dhcp == NULL) {
mbed714	0:d616ece2d859	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
mbed714	0:d616ece2d859	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
mbed714	0:d616ece2d859	636	if (dhcp == NULL) {
mbed714	0:d616ece2d859	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
mbed714	0:d616ece2d859	638	return ERR_MEM;
mbed714	0:d616ece2d859	639	}
mbed714	0:d616ece2d859	640	/* store this dhcp client in the netif */
mbed714	0:d616ece2d859	641	netif->dhcp = dhcp;
mbed714	0:d616ece2d859	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
mbed714	0:d616ece2d859	643	/* already has DHCP client attached */
mbed714	0:d616ece2d859	644	} else {
mbed714	0:d616ece2d859	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
mbed714	0:d616ece2d859	646	if (dhcp->pcb != NULL) {
mbed714	0:d616ece2d859	647	udp_remove(dhcp->pcb);
mbed714	0:d616ece2d859	648	}
mbed714	0:d616ece2d859	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
mbed714	0:d616ece2d859	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
mbed714	0:d616ece2d859	651	}
mbed714	0:d616ece2d859	652
mbed714	0:d616ece2d859	653	/* clear data structure */
mbed714	0:d616ece2d859	654	memset(dhcp, 0, sizeof(struct dhcp));
mbed714	0:d616ece2d859	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
mbed714	0:d616ece2d859	656	/* allocate UDP PCB */
mbed714	0:d616ece2d859	657	dhcp->pcb = udp_new();
mbed714	0:d616ece2d859	658	if (dhcp->pcb == NULL) {
mbed714	0:d616ece2d859	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
mbed714	0:d616ece2d859	660	return ERR_MEM;
mbed714	0:d616ece2d859	661	}
mbed714	0:d616ece2d859	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
mbed714	0:d616ece2d859	663	/* set up local and remote port for the pcb */
mbed714	0:d616ece2d859	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
mbed714	0:d616ece2d859	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
mbed714	0:d616ece2d859	666	/* set up the recv callback and argument */
mbed714	0:d616ece2d859	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
mbed714	0:d616ece2d859	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
mbed714	0:d616ece2d859	669	/* (re)start the DHCP negotiation */
mbed714	0:d616ece2d859	670	result = dhcp_discover(netif);
mbed714	0:d616ece2d859	671	if (result != ERR_OK) {
mbed714	0:d616ece2d859	672	/* free resources allocated above */
mbed714	0:d616ece2d859	673	dhcp_stop(netif);
mbed714	0:d616ece2d859	674	return ERR_MEM;
mbed714	0:d616ece2d859	675	}
mbed714	0:d616ece2d859	676	/* Set the flag that says this netif is handled by DHCP. */
mbed714	0:d616ece2d859	677	netif->flags \|= NETIF_FLAG_DHCP;
mbed714	0:d616ece2d859	678	return result;
mbed714	0:d616ece2d859	679	}
mbed714	0:d616ece2d859	680
mbed714	0:d616ece2d859	681	/**
mbed714	0:d616ece2d859	682	* Inform a DHCP server of our manual configuration.
mbed714	0:d616ece2d859	683	*
mbed714	0:d616ece2d859	684	* This informs DHCP servers of our fixed IP address configuration
mbed714	0:d616ece2d859	685	* by sending an INFORM message. It does not involve DHCP address
mbed714	0:d616ece2d859	686	* configuration, it is just here to be nice to the network.
mbed714	0:d616ece2d859	687	*
mbed714	0:d616ece2d859	688	* @param netif The lwIP network interface
mbed714	0:d616ece2d859	689	*/
mbed714	0:d616ece2d859	690	void
mbed714	0:d616ece2d859	691	dhcp_inform(struct netif *netif)
mbed714	0:d616ece2d859	692	{
mbed714	0:d616ece2d859	693	struct dhcp dhcp;
mbed714	0:d616ece2d859	694	err_t result = ERR_OK;
mbed714	0:d616ece2d859	695	struct udp_pcb *pcb;
mbed714	0:d616ece2d859	696
mbed714	0:d616ece2d859	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
mbed714	0:d616ece2d859	698
mbed714	0:d616ece2d859	699	memset(&dhcp, 0, sizeof(struct dhcp));
mbed714	0:d616ece2d859	700	dhcp_set_state(&dhcp, DHCP_INFORM);
mbed714	0:d616ece2d859	701
mbed714	0:d616ece2d859	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
mbed714	0:d616ece2d859	703	/* re-use existing pcb */
mbed714	0:d616ece2d859	704	pcb = netif->dhcp->pcb;
mbed714	0:d616ece2d859	705	} else {
mbed714	0:d616ece2d859	706	pcb = udp_new();
mbed714	0:d616ece2d859	707	if (pcb == NULL) {
mbed714	0:d616ece2d859	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
mbed714	0:d616ece2d859	709	return;
mbed714	0:d616ece2d859	710	}
mbed714	0:d616ece2d859	711	dhcp.pcb = pcb;
mbed714	0:d616ece2d859	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
mbed714	0:d616ece2d859	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
mbed714	0:d616ece2d859	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
mbed714	0:d616ece2d859	715	}
mbed714	0:d616ece2d859	716	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
mbed714	0:d616ece2d859	718	if (result == ERR_OK) {
mbed714	0:d616ece2d859	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
mbed714	0:d616ece2d859	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
mbed714	0:d616ece2d859	721
mbed714	0:d616ece2d859	722	dhcp_option_trailer(&dhcp);
mbed714	0:d616ece2d859	723
mbed714	0:d616ece2d859	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
mbed714	0:d616ece2d859	725
mbed714	0:d616ece2d859	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
mbed714	0:d616ece2d859	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	728	dhcp_delete_msg(&dhcp);
mbed714	0:d616ece2d859	729	} else {
mbed714	0:d616ece2d859	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	731	}
mbed714	0:d616ece2d859	732
mbed714	0:d616ece2d859	733	if (dhcp.pcb != NULL) {
mbed714	0:d616ece2d859	734	/* otherwise, the existing pcb was used */
mbed714	0:d616ece2d859	735	udp_remove(dhcp.pcb);
mbed714	0:d616ece2d859	736	}
mbed714	0:d616ece2d859	737	}
mbed714	0:d616ece2d859	738
mbed714	0:d616ece2d859	739	/** Handle a possible change in the network configuration.
mbed714	0:d616ece2d859	740	*
mbed714	0:d616ece2d859	741	* This enters the REBOOTING state to verify that the currently bound
mbed714	0:d616ece2d859	742	* address is still valid.
mbed714	0:d616ece2d859	743	*/
mbed714	0:d616ece2d859	744	void
mbed714	0:d616ece2d859	745	dhcp_network_changed(struct netif *netif)
mbed714	0:d616ece2d859	746	{
mbed714	0:d616ece2d859	747	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	748	if (!dhcp)
mbed714	0:d616ece2d859	749	return;
mbed714	0:d616ece2d859	750	switch (dhcp->state) {
mbed714	0:d616ece2d859	751	case DHCP_REBINDING:
mbed714	0:d616ece2d859	752	case DHCP_RENEWING:
mbed714	0:d616ece2d859	753	case DHCP_BOUND:
mbed714	0:d616ece2d859	754	case DHCP_REBOOTING:
mbed714	0:d616ece2d859	755	netif_set_down(netif);
mbed714	0:d616ece2d859	756	dhcp->tries = 0;
mbed714	0:d616ece2d859	757	dhcp_reboot(netif);
mbed714	0:d616ece2d859	758	break;
mbed714	0:d616ece2d859	759	case DHCP_OFF:
mbed714	0:d616ece2d859	760	/* stay off */
mbed714	0:d616ece2d859	761	break;
mbed714	0:d616ece2d859	762	default:
mbed714	0:d616ece2d859	763	dhcp->tries = 0;
mbed714	0:d616ece2d859	764	#if LWIP_DHCP_AUTOIP_COOP
mbed714	0:d616ece2d859	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
mbed714	0:d616ece2d859	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
mbed714	0:d616ece2d859	767	dhcp_discover(netif);
mbed714	0:d616ece2d859	768	break;
mbed714	0:d616ece2d859	769	}
mbed714	0:d616ece2d859	770	}
mbed714	0:d616ece2d859	771
mbed714	0:d616ece2d859	772	#if DHCP_DOES_ARP_CHECK
mbed714	0:d616ece2d859	773	/**
mbed714	0:d616ece2d859	774	* Match an ARP reply with the offered IP address.
mbed714	0:d616ece2d859	775	*
mbed714	0:d616ece2d859	776	* @param netif the network interface on which the reply was received
mbed714	0:d616ece2d859	777	* @param addr The IP address we received a reply from
mbed714	0:d616ece2d859	778	*/
mbed714	0:d616ece2d859	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
mbed714	0:d616ece2d859	780	{
mbed714	0:d616ece2d859	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
mbed714	0:d616ece2d859	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
mbed714	0:d616ece2d859	783	/* is a DHCP client doing an ARP check? */
mbed714	0:d616ece2d859	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
mbed714	0:d616ece2d859	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
mbed714	0:d616ece2d859	786	ip4_addr_get_u32(addr)));
mbed714	0:d616ece2d859	787	/* did a host respond with the address we
mbed714	0:d616ece2d859	788	were offered by the DHCP server? */
mbed714	0:d616ece2d859	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
mbed714	0:d616ece2d859	790	/* we will not accept the offered address */
mbed714	0:d616ece2d859	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
mbed714	0:d616ece2d859	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
mbed714	0:d616ece2d859	793	dhcp_decline(netif);
mbed714	0:d616ece2d859	794	}
mbed714	0:d616ece2d859	795	}
mbed714	0:d616ece2d859	796	}
mbed714	0:d616ece2d859	797
mbed714	0:d616ece2d859	798	/**
mbed714	0:d616ece2d859	799	* Decline an offered lease.
mbed714	0:d616ece2d859	800	*
mbed714	0:d616ece2d859	801	* Tell the DHCP server we do not accept the offered address.
mbed714	0:d616ece2d859	802	* One reason to decline the lease is when we find out the address
mbed714	0:d616ece2d859	803	* is already in use by another host (through ARP).
mbed714	0:d616ece2d859	804	*
mbed714	0:d616ece2d859	805	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	806	*/
mbed714	0:d616ece2d859	807	static err_t
mbed714	0:d616ece2d859	808	dhcp_decline(struct netif *netif)
mbed714	0:d616ece2d859	809	{
mbed714	0:d616ece2d859	810	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	811	err_t result = ERR_OK;
mbed714	0:d616ece2d859	812	u16_t msecs;
mbed714	0:d616ece2d859	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
mbed714	0:d616ece2d859	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
mbed714	0:d616ece2d859	815	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
mbed714	0:d616ece2d859	817	if (result == ERR_OK) {
mbed714	0:d616ece2d859	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
mbed714	0:d616ece2d859	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
mbed714	0:d616ece2d859	820
mbed714	0:d616ece2d859	821	dhcp_option_trailer(dhcp);
mbed714	0:d616ece2d859	822	/* resize pbuf to reflect true size of options */
mbed714	0:d616ece2d859	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
mbed714	0:d616ece2d859	824
mbed714	0:d616ece2d859	825	/* per section 4.4.4, broadcast DECLINE messages */
mbed714	0:d616ece2d859	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	827	dhcp_delete_msg(dhcp);
mbed714	0:d616ece2d859	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
mbed714	0:d616ece2d859	829	} else {
mbed714	0:d616ece2d859	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	831	("dhcp_decline: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	832	}
mbed714	0:d616ece2d859	833	dhcp->tries++;
mbed714	0:d616ece2d859	834	msecs = 10*1000;
mbed714	0:d616ece2d859	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	837	return result;
mbed714	0:d616ece2d859	838	}
mbed714	0:d616ece2d859	839	#endif /* DHCP_DOES_ARP_CHECK */
mbed714	0:d616ece2d859	840
mbed714	0:d616ece2d859	841
mbed714	0:d616ece2d859	842	/**
mbed714	0:d616ece2d859	843	* Start the DHCP process, discover a DHCP server.
mbed714	0:d616ece2d859	844	*
mbed714	0:d616ece2d859	845	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	846	*/
mbed714	0:d616ece2d859	847	static err_t
mbed714	0:d616ece2d859	848	dhcp_discover(struct netif *netif)
mbed714	0:d616ece2d859	849	{
mbed714	0:d616ece2d859	850	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	851	err_t result = ERR_OK;
mbed714	0:d616ece2d859	852	u16_t msecs;
mbed714	0:d616ece2d859	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
mbed714	0:d616ece2d859	854	ip_addr_set_any(&dhcp->offered_ip_addr);
mbed714	0:d616ece2d859	855	dhcp_set_state(dhcp, DHCP_SELECTING);
mbed714	0:d616ece2d859	856	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
mbed714	0:d616ece2d859	858	if (result == ERR_OK) {
mbed714	0:d616ece2d859	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
mbed714	0:d616ece2d859	860
mbed714	0:d616ece2d859	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
mbed714	0:d616ece2d859	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
mbed714	0:d616ece2d859	863
mbed714	0:d616ece2d859	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
mbed714	0:d616ece2d859	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
mbed714	0:d616ece2d859	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
mbed714	0:d616ece2d859	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
mbed714	0:d616ece2d859	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
mbed714	0:d616ece2d859	869
mbed714	0:d616ece2d859	870	dhcp_option_trailer(dhcp);
mbed714	0:d616ece2d859	871
mbed714	0:d616ece2d859	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
mbed714	0:d616ece2d859	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
mbed714	0:d616ece2d859	874
mbed714	0:d616ece2d859	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
mbed714	0:d616ece2d859	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
mbed714	0:d616ece2d859	878	dhcp_delete_msg(dhcp);
mbed714	0:d616ece2d859	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
mbed714	0:d616ece2d859	880	} else {
mbed714	0:d616ece2d859	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	882	}
mbed714	0:d616ece2d859	883	dhcp->tries++;
mbed714	0:d616ece2d859	884	#if LWIP_DHCP_AUTOIP_COOP
mbed714	0:d616ece2d859	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
mbed714	0:d616ece2d859	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
mbed714	0:d616ece2d859	887	autoip_start(netif);
mbed714	0:d616ece2d859	888	}
mbed714	0:d616ece2d859	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
mbed714	0:d616ece2d859	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
mbed714	0:d616ece2d859	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	893	return result;
mbed714	0:d616ece2d859	894	}
mbed714	0:d616ece2d859	895
mbed714	0:d616ece2d859	896
mbed714	0:d616ece2d859	897	/**
mbed714	0:d616ece2d859	898	* Bind the interface to the offered IP address.
mbed714	0:d616ece2d859	899	*
mbed714	0:d616ece2d859	900	* @param netif network interface to bind to the offered address
mbed714	0:d616ece2d859	901	*/
mbed714	0:d616ece2d859	902	static void
mbed714	0:d616ece2d859	903	dhcp_bind(struct netif *netif)
mbed714	0:d616ece2d859	904	{
mbed714	0:d616ece2d859	905	u32_t timeout;
mbed714	0:d616ece2d859	906	struct dhcp *dhcp;
mbed714	0:d616ece2d859	907	ip_addr_t sn_mask, gw_addr;
mbed714	0:d616ece2d859	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
mbed714	0:d616ece2d859	909	dhcp = netif->dhcp;
mbed714	0:d616ece2d859	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	912
mbed714	0:d616ece2d859	913	/* temporary DHCP lease? */
mbed714	0:d616ece2d859	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
mbed714	0:d616ece2d859	915	/* set renewal period timer */
mbed714	0:d616ece2d859	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
mbed714	0:d616ece2d859	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
mbed714	0:d616ece2d859	918	if(timeout > 0xffff) {
mbed714	0:d616ece2d859	919	timeout = 0xffff;
mbed714	0:d616ece2d859	920	}
mbed714	0:d616ece2d859	921	dhcp->t1_timeout = (u16_t)timeout;
mbed714	0:d616ece2d859	922	if (dhcp->t1_timeout == 0) {
mbed714	0:d616ece2d859	923	dhcp->t1_timeout = 1;
mbed714	0:d616ece2d859	924	}
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	926	}
mbed714	0:d616ece2d859	927	/* set renewal period timer */
mbed714	0:d616ece2d859	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
mbed714	0:d616ece2d859	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
mbed714	0:d616ece2d859	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
mbed714	0:d616ece2d859	931	if(timeout > 0xffff) {
mbed714	0:d616ece2d859	932	timeout = 0xffff;
mbed714	0:d616ece2d859	933	}
mbed714	0:d616ece2d859	934	dhcp->t2_timeout = (u16_t)timeout;
mbed714	0:d616ece2d859	935	if (dhcp->t2_timeout == 0) {
mbed714	0:d616ece2d859	936	dhcp->t2_timeout = 1;
mbed714	0:d616ece2d859	937	}
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	939	}
mbed714	0:d616ece2d859	940
mbed714	0:d616ece2d859	941	if (dhcp->subnet_mask_given) {
mbed714	0:d616ece2d859	942	/* copy offered network mask */
mbed714	0:d616ece2d859	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
mbed714	0:d616ece2d859	944	} else {
mbed714	0:d616ece2d859	945	/* subnet mask not given, choose a safe subnet mask given the network class */
mbed714	0:d616ece2d859	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
mbed714	0:d616ece2d859	947	if (first_octet <= 127) {
mbed714	0:d616ece2d859	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
mbed714	0:d616ece2d859	949	} else if (first_octet >= 192) {
mbed714	0:d616ece2d859	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
mbed714	0:d616ece2d859	951	} else {
mbed714	0:d616ece2d859	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
mbed714	0:d616ece2d859	953	}
mbed714	0:d616ece2d859	954	}
mbed714	0:d616ece2d859	955
mbed714	0:d616ece2d859	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
mbed714	0:d616ece2d859	957	/* gateway address not given? */
mbed714	0:d616ece2d859	958	if (ip_addr_isany(&gw_addr)) {
mbed714	0:d616ece2d859	959	/* copy network address */
mbed714	0:d616ece2d859	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
mbed714	0:d616ece2d859	961	/* use first host address on network as gateway */
mbed714	0:d616ece2d859	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
mbed714	0:d616ece2d859	963	}
mbed714	0:d616ece2d859	964
mbed714	0:d616ece2d859	965	#if LWIP_DHCP_AUTOIP_COOP
mbed714	0:d616ece2d859	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
mbed714	0:d616ece2d859	967	autoip_stop(netif);
mbed714	0:d616ece2d859	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
mbed714	0:d616ece2d859	969	}
mbed714	0:d616ece2d859	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
mbed714	0:d616ece2d859	971
mbed714	0:d616ece2d859	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
mbed714	0:d616ece2d859	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
mbed714	0:d616ece2d859	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
mbed714	0:d616ece2d859	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
mbed714	0:d616ece2d859	976	ip4_addr_get_u32(&sn_mask)));
mbed714	0:d616ece2d859	977	netif_set_netmask(netif, &sn_mask);
mbed714	0:d616ece2d859	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
mbed714	0:d616ece2d859	979	ip4_addr_get_u32(&gw_addr)));
mbed714	0:d616ece2d859	980	netif_set_gw(netif, &gw_addr);
mbed714	0:d616ece2d859	981	/* bring the interface up */
mbed714	0:d616ece2d859	982	netif_set_up(netif);
mbed714	0:d616ece2d859	983	/* netif is now bound to DHCP leased address */
mbed714	0:d616ece2d859	984	dhcp_set_state(dhcp, DHCP_BOUND);
mbed714	0:d616ece2d859	985	}
mbed714	0:d616ece2d859	986
mbed714	0:d616ece2d859	987	/**
mbed714	0:d616ece2d859	988	* Renew an existing DHCP lease at the involved DHCP server.
mbed714	0:d616ece2d859	989	*
mbed714	0:d616ece2d859	990	* @param netif network interface which must renew its lease
mbed714	0:d616ece2d859	991	*/
mbed714	0:d616ece2d859	992	err_t
mbed714	0:d616ece2d859	993	dhcp_renew(struct netif *netif)
mbed714	0:d616ece2d859	994	{
mbed714	0:d616ece2d859	995	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	996	err_t result;
mbed714	0:d616ece2d859	997	u16_t msecs;
mbed714	0:d616ece2d859	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
mbed714	0:d616ece2d859	999	dhcp_set_state(dhcp, DHCP_RENEWING);
mbed714	0:d616ece2d859	1000
mbed714	0:d616ece2d859	1001	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
mbed714	0:d616ece2d859	1003	if (result == ERR_OK) {
mbed714	0:d616ece2d859	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
mbed714	0:d616ece2d859	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
mbed714	0:d616ece2d859	1006
mbed714	0:d616ece2d859	1007	#if LWIP_NETIF_HOSTNAME
mbed714	0:d616ece2d859	1008	if (netif->hostname != NULL) {
mbed714	0:d616ece2d859	1009	const char p = (const char)netif->hostname;
mbed714	0:d616ece2d859	1010	u8_t namelen = (u8_t)strlen(p);
mbed714	0:d616ece2d859	1011	if (namelen > 0) {
mbed714	0:d616ece2d859	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
mbed714	0:d616ece2d859	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
mbed714	0:d616ece2d859	1014	while (*p) {
mbed714	0:d616ece2d859	1015	dhcp_option_byte(dhcp, *p++);
mbed714	0:d616ece2d859	1016	}
mbed714	0:d616ece2d859	1017	}
mbed714	0:d616ece2d859	1018	}
mbed714	0:d616ece2d859	1019	#endif /* LWIP_NETIF_HOSTNAME */
mbed714	0:d616ece2d859	1020
mbed714	0:d616ece2d859	1021	#if 0
mbed714	0:d616ece2d859	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
mbed714	0:d616ece2d859	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
mbed714	0:d616ece2d859	1024	#endif
mbed714	0:d616ece2d859	1025
mbed714	0:d616ece2d859	1026	#if 0
mbed714	0:d616ece2d859	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
mbed714	0:d616ece2d859	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
mbed714	0:d616ece2d859	1029	#endif
mbed714	0:d616ece2d859	1030	/* append DHCP message trailer */
mbed714	0:d616ece2d859	1031	dhcp_option_trailer(dhcp);
mbed714	0:d616ece2d859	1032
mbed714	0:d616ece2d859	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
mbed714	0:d616ece2d859	1034
mbed714	0:d616ece2d859	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	1036	dhcp_delete_msg(dhcp);
mbed714	0:d616ece2d859	1037
mbed714	0:d616ece2d859	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
mbed714	0:d616ece2d859	1039	} else {
mbed714	0:d616ece2d859	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	1041	}
mbed714	0:d616ece2d859	1042	dhcp->tries++;
mbed714	0:d616ece2d859	1043	/* back-off on retries, but to a maximum of 20 seconds */
mbed714	0:d616ece2d859	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
mbed714	0:d616ece2d859	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	1047	return result;
mbed714	0:d616ece2d859	1048	}
mbed714	0:d616ece2d859	1049
mbed714	0:d616ece2d859	1050	/**
mbed714	0:d616ece2d859	1051	* Rebind with a DHCP server for an existing DHCP lease.
mbed714	0:d616ece2d859	1052	*
mbed714	0:d616ece2d859	1053	* @param netif network interface which must rebind with a DHCP server
mbed714	0:d616ece2d859	1054	*/
mbed714	0:d616ece2d859	1055	static err_t
mbed714	0:d616ece2d859	1056	dhcp_rebind(struct netif *netif)
mbed714	0:d616ece2d859	1057	{
mbed714	0:d616ece2d859	1058	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	1059	err_t result;
mbed714	0:d616ece2d859	1060	u16_t msecs;
mbed714	0:d616ece2d859	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
mbed714	0:d616ece2d859	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
mbed714	0:d616ece2d859	1063
mbed714	0:d616ece2d859	1064	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
mbed714	0:d616ece2d859	1066	if (result == ERR_OK) {
mbed714	0:d616ece2d859	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
mbed714	0:d616ece2d859	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
mbed714	0:d616ece2d859	1069
mbed714	0:d616ece2d859	1070	#if LWIP_NETIF_HOSTNAME
mbed714	0:d616ece2d859	1071	if (netif->hostname != NULL) {
mbed714	0:d616ece2d859	1072	const char p = (const char)netif->hostname;
mbed714	0:d616ece2d859	1073	u8_t namelen = (u8_t)strlen(p);
mbed714	0:d616ece2d859	1074	if (namelen > 0) {
mbed714	0:d616ece2d859	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
mbed714	0:d616ece2d859	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
mbed714	0:d616ece2d859	1077	while (*p) {
mbed714	0:d616ece2d859	1078	dhcp_option_byte(dhcp, *p++);
mbed714	0:d616ece2d859	1079	}
mbed714	0:d616ece2d859	1080	}
mbed714	0:d616ece2d859	1081	}
mbed714	0:d616ece2d859	1082	#endif /* LWIP_NETIF_HOSTNAME */
mbed714	0:d616ece2d859	1083
mbed714	0:d616ece2d859	1084	#if 0
mbed714	0:d616ece2d859	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
mbed714	0:d616ece2d859	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
mbed714	0:d616ece2d859	1087
mbed714	0:d616ece2d859	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
mbed714	0:d616ece2d859	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
mbed714	0:d616ece2d859	1090	#endif
mbed714	0:d616ece2d859	1091
mbed714	0:d616ece2d859	1092	dhcp_option_trailer(dhcp);
mbed714	0:d616ece2d859	1093
mbed714	0:d616ece2d859	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
mbed714	0:d616ece2d859	1095
mbed714	0:d616ece2d859	1096	/* broadcast to server */
mbed714	0:d616ece2d859	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	1098	dhcp_delete_msg(dhcp);
mbed714	0:d616ece2d859	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
mbed714	0:d616ece2d859	1100	} else {
mbed714	0:d616ece2d859	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	1102	}
mbed714	0:d616ece2d859	1103	dhcp->tries++;
mbed714	0:d616ece2d859	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
mbed714	0:d616ece2d859	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	1107	return result;
mbed714	0:d616ece2d859	1108	}
mbed714	0:d616ece2d859	1109
mbed714	0:d616ece2d859	1110	/**
mbed714	0:d616ece2d859	1111	* Enter REBOOTING state to verify an existing lease
mbed714	0:d616ece2d859	1112	*
mbed714	0:d616ece2d859	1113	* @param netif network interface which must reboot
mbed714	0:d616ece2d859	1114	*/
mbed714	0:d616ece2d859	1115	static err_t
mbed714	0:d616ece2d859	1116	dhcp_reboot(struct netif *netif)
mbed714	0:d616ece2d859	1117	{
mbed714	0:d616ece2d859	1118	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	1119	err_t result;
mbed714	0:d616ece2d859	1120	u16_t msecs;
mbed714	0:d616ece2d859	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
mbed714	0:d616ece2d859	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
mbed714	0:d616ece2d859	1123
mbed714	0:d616ece2d859	1124	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
mbed714	0:d616ece2d859	1126	if (result == ERR_OK) {
mbed714	0:d616ece2d859	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
mbed714	0:d616ece2d859	1128	dhcp_option_short(dhcp, 576);
mbed714	0:d616ece2d859	1129
mbed714	0:d616ece2d859	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
mbed714	0:d616ece2d859	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
mbed714	0:d616ece2d859	1132
mbed714	0:d616ece2d859	1133	dhcp_option_trailer(dhcp);
mbed714	0:d616ece2d859	1134
mbed714	0:d616ece2d859	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
mbed714	0:d616ece2d859	1136
mbed714	0:d616ece2d859	1137	/* broadcast to server */
mbed714	0:d616ece2d859	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	1139	dhcp_delete_msg(dhcp);
mbed714	0:d616ece2d859	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
mbed714	0:d616ece2d859	1141	} else {
mbed714	0:d616ece2d859	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	1143	}
mbed714	0:d616ece2d859	1144	dhcp->tries++;
mbed714	0:d616ece2d859	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
mbed714	0:d616ece2d859	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	1148	return result;
mbed714	0:d616ece2d859	1149	}
mbed714	0:d616ece2d859	1150
mbed714	0:d616ece2d859	1151
mbed714	0:d616ece2d859	1152	/**
mbed714	0:d616ece2d859	1153	* Release a DHCP lease.
mbed714	0:d616ece2d859	1154	*
mbed714	0:d616ece2d859	1155	* @param netif network interface which must release its lease
mbed714	0:d616ece2d859	1156	*/
mbed714	0:d616ece2d859	1157	err_t
mbed714	0:d616ece2d859	1158	dhcp_release(struct netif *netif)
mbed714	0:d616ece2d859	1159	{
mbed714	0:d616ece2d859	1160	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	1161	err_t result;
mbed714	0:d616ece2d859	1162	u16_t msecs;
mbed714	0:d616ece2d859	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
mbed714	0:d616ece2d859	1164
mbed714	0:d616ece2d859	1165	/* idle DHCP client */
mbed714	0:d616ece2d859	1166	dhcp_set_state(dhcp, DHCP_OFF);
mbed714	0:d616ece2d859	1167	/* clean old DHCP offer */
mbed714	0:d616ece2d859	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
mbed714	0:d616ece2d859	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
mbed714	0:d616ece2d859	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
mbed714	0:d616ece2d859	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
mbed714	0:d616ece2d859	1172	#if LWIP_DHCP_BOOTP_FILE
mbed714	0:d616ece2d859	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
mbed714	0:d616ece2d859	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
mbed714	0:d616ece2d859	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
mbed714	0:d616ece2d859	1176
mbed714	0:d616ece2d859	1177	/* create and initialize the DHCP message header */
mbed714	0:d616ece2d859	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
mbed714	0:d616ece2d859	1179	if (result == ERR_OK) {
mbed714	0:d616ece2d859	1180	dhcp_option_trailer(dhcp);
mbed714	0:d616ece2d859	1181
mbed714	0:d616ece2d859	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
mbed714	0:d616ece2d859	1183
mbed714	0:d616ece2d859	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
mbed714	0:d616ece2d859	1185	dhcp_delete_msg(dhcp);
mbed714	0:d616ece2d859	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
mbed714	0:d616ece2d859	1187	} else {
mbed714	0:d616ece2d859	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
mbed714	0:d616ece2d859	1189	}
mbed714	0:d616ece2d859	1190	dhcp->tries++;
mbed714	0:d616ece2d859	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
mbed714	0:d616ece2d859	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
mbed714	0:d616ece2d859	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
mbed714	0:d616ece2d859	1194	/* bring the interface down */
mbed714	0:d616ece2d859	1195	netif_set_down(netif);
mbed714	0:d616ece2d859	1196	/* remove IP address from interface */
mbed714	0:d616ece2d859	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
mbed714	0:d616ece2d859	1198	netif_set_gw(netif, IP_ADDR_ANY);
mbed714	0:d616ece2d859	1199	netif_set_netmask(netif, IP_ADDR_ANY);
mbed714	0:d616ece2d859	1200
mbed714	0:d616ece2d859	1201	return result;
mbed714	0:d616ece2d859	1202	}
mbed714	0:d616ece2d859	1203
mbed714	0:d616ece2d859	1204	/**
mbed714	0:d616ece2d859	1205	* Remove the DHCP client from the interface.
mbed714	0:d616ece2d859	1206	*
mbed714	0:d616ece2d859	1207	* @param netif The network interface to stop DHCP on
mbed714	0:d616ece2d859	1208	*/
mbed714	0:d616ece2d859	1209	void
mbed714	0:d616ece2d859	1210	dhcp_stop(struct netif *netif)
mbed714	0:d616ece2d859	1211	{
mbed714	0:d616ece2d859	1212	struct dhcp *dhcp;
mbed714	0:d616ece2d859	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
mbed714	0:d616ece2d859	1214	dhcp = netif->dhcp;
mbed714	0:d616ece2d859	1215	/* Remove the flag that says this netif is handled by DHCP. */
mbed714	0:d616ece2d859	1216	netif->flags &= ~NETIF_FLAG_DHCP;
mbed714	0:d616ece2d859	1217
mbed714	0:d616ece2d859	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
mbed714	0:d616ece2d859	1219	/* netif is DHCP configured? */
mbed714	0:d616ece2d859	1220	if (dhcp != NULL) {
mbed714	0:d616ece2d859	1221	#if LWIP_DHCP_AUTOIP_COOP
mbed714	0:d616ece2d859	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
mbed714	0:d616ece2d859	1223	autoip_stop(netif);
mbed714	0:d616ece2d859	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
mbed714	0:d616ece2d859	1225	}
mbed714	0:d616ece2d859	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
mbed714	0:d616ece2d859	1227
mbed714	0:d616ece2d859	1228	if (dhcp->pcb != NULL) {
mbed714	0:d616ece2d859	1229	udp_remove(dhcp->pcb);
mbed714	0:d616ece2d859	1230	dhcp->pcb = NULL;
mbed714	0:d616ece2d859	1231	}
mbed714	0:d616ece2d859	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
mbed714	0:d616ece2d859	1233	dhcp_set_state(dhcp, DHCP_OFF);
mbed714	0:d616ece2d859	1234	}
mbed714	0:d616ece2d859	1235	}
mbed714	0:d616ece2d859	1236
mbed714	0:d616ece2d859	1237	/*
mbed714	0:d616ece2d859	1238	* Set the DHCP state of a DHCP client.
mbed714	0:d616ece2d859	1239	*
mbed714	0:d616ece2d859	1240	* If the state changed, reset the number of tries.
mbed714	0:d616ece2d859	1241	*/
mbed714	0:d616ece2d859	1242	static void
mbed714	0:d616ece2d859	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
mbed714	0:d616ece2d859	1244	{
mbed714	0:d616ece2d859	1245	if (new_state != dhcp->state) {
mbed714	0:d616ece2d859	1246	dhcp->state = new_state;
mbed714	0:d616ece2d859	1247	dhcp->tries = 0;
mbed714	0:d616ece2d859	1248	dhcp->request_timeout = 0;
mbed714	0:d616ece2d859	1249	}
mbed714	0:d616ece2d859	1250	}
mbed714	0:d616ece2d859	1251
mbed714	0:d616ece2d859	1252	/*
mbed714	0:d616ece2d859	1253	* Concatenate an option type and length field to the outgoing
mbed714	0:d616ece2d859	1254	* DHCP message.
mbed714	0:d616ece2d859	1255	*
mbed714	0:d616ece2d859	1256	*/
mbed714	0:d616ece2d859	1257	static void
mbed714	0:d616ece2d859	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
mbed714	0:d616ece2d859	1259	{
mbed714	0:d616ece2d859	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);
mbed714	0:d616ece2d859	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
mbed714	0:d616ece2d859	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
mbed714	0:d616ece2d859	1263	}
mbed714	0:d616ece2d859	1264	/*
mbed714	0:d616ece2d859	1265	* Concatenate a single byte to the outgoing DHCP message.
mbed714	0:d616ece2d859	1266	*
mbed714	0:d616ece2d859	1267	*/
mbed714	0:d616ece2d859	1268	static void
mbed714	0:d616ece2d859	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
mbed714	0:d616ece2d859	1270	{
mbed714	0:d616ece2d859	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
mbed714	0:d616ece2d859	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
mbed714	0:d616ece2d859	1273	}
mbed714	0:d616ece2d859	1274
mbed714	0:d616ece2d859	1275	static void
mbed714	0:d616ece2d859	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
mbed714	0:d616ece2d859	1277	{
mbed714	0:d616ece2d859	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
mbed714	0:d616ece2d859	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
mbed714	0:d616ece2d859	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
mbed714	0:d616ece2d859	1281	}
mbed714	0:d616ece2d859	1282
mbed714	0:d616ece2d859	1283	static void
mbed714	0:d616ece2d859	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
mbed714	0:d616ece2d859	1285	{
mbed714	0:d616ece2d859	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
mbed714	0:d616ece2d859	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
mbed714	0:d616ece2d859	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
mbed714	0:d616ece2d859	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
mbed714	0:d616ece2d859	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
mbed714	0:d616ece2d859	1291	}
mbed714	0:d616ece2d859	1292
mbed714	0:d616ece2d859	1293	/**
mbed714	0:d616ece2d859	1294	* Extract the DHCP message and the DHCP options.
mbed714	0:d616ece2d859	1295	*
mbed714	0:d616ece2d859	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
mbed714	0:d616ece2d859	1297	* piece of memory. As a DHCP message is variable sized by its options,
mbed714	0:d616ece2d859	1298	* and also allows overriding some fields for options, the easy approach
mbed714	0:d616ece2d859	1299	* is to first unfold the options into a conitguous piece of memory, and
mbed714	0:d616ece2d859	1300	* use that further on.
mbed714	0:d616ece2d859	1301	*
mbed714	0:d616ece2d859	1302	*/
mbed714	0:d616ece2d859	1303	static err_t
mbed714	0:d616ece2d859	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
mbed714	0:d616ece2d859	1305	{
mbed714	0:d616ece2d859	1306	u8_t *options;
mbed714	0:d616ece2d859	1307	u16_t offset;
mbed714	0:d616ece2d859	1308	u16_t offset_max;
mbed714	0:d616ece2d859	1309	u16_t options_idx;
mbed714	0:d616ece2d859	1310	u16_t options_idx_max;
mbed714	0:d616ece2d859	1311	struct pbuf *q;
mbed714	0:d616ece2d859	1312	int parse_file_as_options = 0;
mbed714	0:d616ece2d859	1313	int parse_sname_as_options = 0;
mbed714	0:d616ece2d859	1314
mbed714	0:d616ece2d859	1315	/* clear received options */
mbed714	0:d616ece2d859	1316	dhcp_clear_all_options(dhcp);
mbed714	0:d616ece2d859	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
mbed714	0:d616ece2d859	1318	if (p->len < DHCP_SNAME_OFS) {
mbed714	0:d616ece2d859	1319	return ERR_BUF;
mbed714	0:d616ece2d859	1320	}
mbed714	0:d616ece2d859	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
mbed714	0:d616ece2d859	1322	#if LWIP_DHCP_BOOTP_FILE
mbed714	0:d616ece2d859	1323	/* clear boot file name */
mbed714	0:d616ece2d859	1324	dhcp->boot_file_name[0] = 0;
mbed714	0:d616ece2d859	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
mbed714	0:d616ece2d859	1326
mbed714	0:d616ece2d859	1327	/* parse options */
mbed714	0:d616ece2d859	1328
mbed714	0:d616ece2d859	1329	/* start with options field */
mbed714	0:d616ece2d859	1330	options_idx = DHCP_OPTIONS_OFS;
mbed714	0:d616ece2d859	1331	/* parse options to the end of the received packet */
mbed714	0:d616ece2d859	1332	options_idx_max = p->tot_len;
mbed714	0:d616ece2d859	1333	again:
mbed714	0:d616ece2d859	1334	q = p;
mbed714	0:d616ece2d859	1335	while((q != NULL) && (options_idx >= q->len)) {
mbed714	0:d616ece2d859	1336	options_idx -= q->len;
mbed714	0:d616ece2d859	1337	options_idx_max -= q->len;
mbed714	0:d616ece2d859	1338	q = q->next;
mbed714	0:d616ece2d859	1339	}
mbed714	0:d616ece2d859	1340	if (q == NULL) {
mbed714	0:d616ece2d859	1341	return ERR_BUF;
mbed714	0:d616ece2d859	1342	}
mbed714	0:d616ece2d859	1343	offset = options_idx;
mbed714	0:d616ece2d859	1344	offset_max = options_idx_max;
mbed714	0:d616ece2d859	1345	options = (u8_t*)q->payload;
mbed714	0:d616ece2d859	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
mbed714	0:d616ece2d859	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
mbed714	0:d616ece2d859	1348	u8_t op = options[offset];
mbed714	0:d616ece2d859	1349	u8_t len;
mbed714	0:d616ece2d859	1350	u8_t decode_len = 0;
mbed714	0:d616ece2d859	1351	int decode_idx = -1;
mbed714	0:d616ece2d859	1352	u16_t val_offset = offset + 2;
mbed714	0:d616ece2d859	1353	/* len byte might be in the next pbuf */
mbed714	0:d616ece2d859	1354	if (offset + 1 < q->len) {
mbed714	0:d616ece2d859	1355	len = options[offset + 1];
mbed714	0:d616ece2d859	1356	} else {
mbed714	0:d616ece2d859	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
mbed714	0:d616ece2d859	1358	}
mbed714	0:d616ece2d859	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
mbed714	0:d616ece2d859	1360	decode_len = len;
mbed714	0:d616ece2d859	1361	switch(op) {
mbed714	0:d616ece2d859	1362	/* case(DHCP_OPTION_END): handled above */
mbed714	0:d616ece2d859	1363	case(DHCP_OPTION_PAD):
mbed714	0:d616ece2d859	1364	/* special option: no len encoded */
mbed714	0:d616ece2d859	1365	decode_len = len = 0;
mbed714	0:d616ece2d859	1366	/* will be increased below */
mbed714	0:d616ece2d859	1367	offset--;
mbed714	0:d616ece2d859	1368	break;
mbed714	0:d616ece2d859	1369	case(DHCP_OPTION_SUBNET_MASK):
mbed714	0:d616ece2d859	1370	LWIP_ASSERT("len == 4", len == 4);
mbed714	0:d616ece2d859	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
mbed714	0:d616ece2d859	1372	break;
mbed714	0:d616ece2d859	1373	case(DHCP_OPTION_ROUTER):
mbed714	0:d616ece2d859	1374	decode_len = 4; /* only copy the first given router */
mbed714	0:d616ece2d859	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
mbed714	0:d616ece2d859	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
mbed714	0:d616ece2d859	1377	break;
mbed714	0:d616ece2d859	1378	case(DHCP_OPTION_DNS_SERVER):
mbed714	0:d616ece2d859	1379	/* special case: there might be more than one server */
mbed714	0:d616ece2d859	1380	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
mbed714	0:d616ece2d859	1381	/* limit number of DNS servers */
mbed714	0:d616ece2d859	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
mbed714	0:d616ece2d859	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
mbed714	0:d616ece2d859	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
mbed714	0:d616ece2d859	1385	break;
mbed714	0:d616ece2d859	1386	case(DHCP_OPTION_LEASE_TIME):
mbed714	0:d616ece2d859	1387	LWIP_ASSERT("len == 4", len == 4);
mbed714	0:d616ece2d859	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
mbed714	0:d616ece2d859	1389	break;
mbed714	0:d616ece2d859	1390	case(DHCP_OPTION_OVERLOAD):
mbed714	0:d616ece2d859	1391	LWIP_ASSERT("len == 1", len == 1);
mbed714	0:d616ece2d859	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
mbed714	0:d616ece2d859	1393	break;
mbed714	0:d616ece2d859	1394	case(DHCP_OPTION_MESSAGE_TYPE):
mbed714	0:d616ece2d859	1395	LWIP_ASSERT("len == 1", len == 1);
mbed714	0:d616ece2d859	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
mbed714	0:d616ece2d859	1397	break;
mbed714	0:d616ece2d859	1398	case(DHCP_OPTION_SERVER_ID):
mbed714	0:d616ece2d859	1399	LWIP_ASSERT("len == 4", len == 4);
mbed714	0:d616ece2d859	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
mbed714	0:d616ece2d859	1401	break;
mbed714	0:d616ece2d859	1402	case(DHCP_OPTION_T1):
mbed714	0:d616ece2d859	1403	LWIP_ASSERT("len == 4", len == 4);
mbed714	0:d616ece2d859	1404	decode_idx = DHCP_OPTION_IDX_T1;
mbed714	0:d616ece2d859	1405	break;
mbed714	0:d616ece2d859	1406	case(DHCP_OPTION_T2):
mbed714	0:d616ece2d859	1407	LWIP_ASSERT("len == 4", len == 4);
mbed714	0:d616ece2d859	1408	decode_idx = DHCP_OPTION_IDX_T2;
mbed714	0:d616ece2d859	1409	break;
mbed714	0:d616ece2d859	1410	default:
mbed714	0:d616ece2d859	1411	decode_len = 0;
mbed714	0:d616ece2d859	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
mbed714	0:d616ece2d859	1413	break;
mbed714	0:d616ece2d859	1414	}
mbed714	0:d616ece2d859	1415	offset += len + 2;
mbed714	0:d616ece2d859	1416	if (decode_len > 0) {
mbed714	0:d616ece2d859	1417	u32_t value = 0;
mbed714	0:d616ece2d859	1418	u16_t copy_len;
mbed714	0:d616ece2d859	1419	decode_next:
mbed714	0:d616ece2d859	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
mbed714	0:d616ece2d859	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
mbed714	0:d616ece2d859	1422	copy_len = LWIP_MIN(decode_len, 4);
mbed714	0:d616ece2d859	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
mbed714	0:d616ece2d859	1424	if (decode_len > 4) {
mbed714	0:d616ece2d859	1425	/* decode more than one u32_t */
mbed714	0:d616ece2d859	1426	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
mbed714	0:d616ece2d859	1427	dhcp_got_option(dhcp, decode_idx);
mbed714	0:d616ece2d859	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
mbed714	0:d616ece2d859	1429	decode_len -= 4;
mbed714	0:d616ece2d859	1430	val_offset += 4;
mbed714	0:d616ece2d859	1431	decode_idx++;
mbed714	0:d616ece2d859	1432	goto decode_next;
mbed714	0:d616ece2d859	1433	} else if (decode_len == 4) {
mbed714	0:d616ece2d859	1434	value = ntohl(value);
mbed714	0:d616ece2d859	1435	} else {
mbed714	0:d616ece2d859	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
mbed714	0:d616ece2d859	1437	value = ((u8_t*)&value)[0];
mbed714	0:d616ece2d859	1438	}
mbed714	0:d616ece2d859	1439	dhcp_got_option(dhcp, decode_idx);
mbed714	0:d616ece2d859	1440	dhcp_set_option_value(dhcp, decode_idx, value);
mbed714	0:d616ece2d859	1441	}
mbed714	0:d616ece2d859	1442	if (offset >= q->len) {
mbed714	0:d616ece2d859	1443	offset -= q->len;
mbed714	0:d616ece2d859	1444	offset_max -= q->len;
mbed714	0:d616ece2d859	1445	q = q->next;
mbed714	0:d616ece2d859	1446	options = (u8_t*)q->payload;
mbed714	0:d616ece2d859	1447	}
mbed714	0:d616ece2d859	1448	}
mbed714	0:d616ece2d859	1449	/* is this an overloaded message? */
mbed714	0:d616ece2d859	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
mbed714	0:d616ece2d859	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
mbed714	0:d616ece2d859	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
mbed714	0:d616ece2d859	1453	if (overload == DHCP_OVERLOAD_FILE) {
mbed714	0:d616ece2d859	1454	parse_file_as_options = 1;
mbed714	0:d616ece2d859	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
mbed714	0:d616ece2d859	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
mbed714	0:d616ece2d859	1457	parse_sname_as_options = 1;
mbed714	0:d616ece2d859	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
mbed714	0:d616ece2d859	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
mbed714	0:d616ece2d859	1460	parse_sname_as_options = 1;
mbed714	0:d616ece2d859	1461	parse_file_as_options = 1;
mbed714	0:d616ece2d859	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
mbed714	0:d616ece2d859	1463	} else {
mbed714	0:d616ece2d859	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
mbed714	0:d616ece2d859	1465	}
mbed714	0:d616ece2d859	1466	#if LWIP_DHCP_BOOTP_FILE
mbed714	0:d616ece2d859	1467	if (!parse_file_as_options) {
mbed714	0:d616ece2d859	1468	/* only do this for ACK messages */
mbed714	0:d616ece2d859	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
mbed714	0:d616ece2d859	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
mbed714	0:d616ece2d859	1471	/* copy bootp file name, don't care for sname (server hostname) */
mbed714	0:d616ece2d859	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
mbed714	0:d616ece2d859	1473	/* make sure the string is really NULL-terminated */
mbed714	0:d616ece2d859	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
mbed714	0:d616ece2d859	1475	}
mbed714	0:d616ece2d859	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
mbed714	0:d616ece2d859	1477	}
mbed714	0:d616ece2d859	1478	if (parse_file_as_options) {
mbed714	0:d616ece2d859	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
mbed714	0:d616ece2d859	1480	parse_file_as_options = 0;
mbed714	0:d616ece2d859	1481	options_idx = DHCP_FILE_OFS;
mbed714	0:d616ece2d859	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
mbed714	0:d616ece2d859	1483	goto again;
mbed714	0:d616ece2d859	1484	} else if (parse_sname_as_options) {
mbed714	0:d616ece2d859	1485	parse_sname_as_options = 0;
mbed714	0:d616ece2d859	1486	options_idx = DHCP_SNAME_OFS;
mbed714	0:d616ece2d859	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
mbed714	0:d616ece2d859	1488	goto again;
mbed714	0:d616ece2d859	1489	}
mbed714	0:d616ece2d859	1490	return ERR_OK;
mbed714	0:d616ece2d859	1491	}
mbed714	0:d616ece2d859	1492
mbed714	0:d616ece2d859	1493	/**
mbed714	0:d616ece2d859	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
mbed714	0:d616ece2d859	1495	*/
mbed714	0:d616ece2d859	1496	static void
mbed714	0:d616ece2d859	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
mbed714	0:d616ece2d859	1498	{
mbed714	0:d616ece2d859	1499	struct netif netif = (struct netif )arg;
mbed714	0:d616ece2d859	1500	struct dhcp *dhcp = netif->dhcp;
mbed714	0:d616ece2d859	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
mbed714	0:d616ece2d859	1502	u8_t msg_type;
mbed714	0:d616ece2d859	1503	u8_t i;
mbed714	0:d616ece2d859	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,
mbed714	0:d616ece2d859	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
mbed714	0:d616ece2d859	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
mbed714	0:d616ece2d859	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
mbed714	0:d616ece2d859	1508	/* prevent warnings about unused arguments */
mbed714	0:d616ece2d859	1509	LWIP_UNUSED_ARG(pcb);
mbed714	0:d616ece2d859	1510	LWIP_UNUSED_ARG(addr);
mbed714	0:d616ece2d859	1511	LWIP_UNUSED_ARG(port);
mbed714	0:d616ece2d859	1512
mbed714	0:d616ece2d859	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
mbed714	0:d616ece2d859	1514
mbed714	0:d616ece2d859	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
mbed714	0:d616ece2d859	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
mbed714	0:d616ece2d859	1517	goto free_pbuf_and_return;
mbed714	0:d616ece2d859	1518	}
mbed714	0:d616ece2d859	1519
mbed714	0:d616ece2d859	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	1522	goto free_pbuf_and_return;
mbed714	0:d616ece2d859	1523	}
mbed714	0:d616ece2d859	1524	/* iterate through hardware address and match against DHCP message */
mbed714	0:d616ece2d859	1525	for (i = 0; i < netif->hwaddr_len; i++) {
mbed714	0:d616ece2d859	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
mbed714	0:d616ece2d859	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
mbed714	0:d616ece2d859	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
mbed714	0:d616ece2d859	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
mbed714	0:d616ece2d859	1530	goto free_pbuf_and_return;
mbed714	0:d616ece2d859	1531	}
mbed714	0:d616ece2d859	1532	}
mbed714	0:d616ece2d859	1533	/* match transaction ID against what we expected */
mbed714	0:d616ece2d859	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
mbed714	0:d616ece2d859	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
mbed714	0:d616ece2d859	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
mbed714	0:d616ece2d859	1537	goto free_pbuf_and_return;
mbed714	0:d616ece2d859	1538	}
mbed714	0:d616ece2d859	1539	/* option fields could be unfold? */
mbed714	0:d616ece2d859	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
mbed714	0:d616ece2d859	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	1542	("problem unfolding DHCP message - too short on memory?\n"));
mbed714	0:d616ece2d859	1543	goto free_pbuf_and_return;
mbed714	0:d616ece2d859	1544	}
mbed714	0:d616ece2d859	1545
mbed714	0:d616ece2d859	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
mbed714	0:d616ece2d859	1547	/* obtain pointer to DHCP message type */
mbed714	0:d616ece2d859	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
mbed714	0:d616ece2d859	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
mbed714	0:d616ece2d859	1550	goto free_pbuf_and_return;
mbed714	0:d616ece2d859	1551	}
mbed714	0:d616ece2d859	1552
mbed714	0:d616ece2d859	1553	/* read DHCP message type */
mbed714	0:d616ece2d859	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
mbed714	0:d616ece2d859	1555	/* message type is DHCP ACK? */
mbed714	0:d616ece2d859	1556	if (msg_type == DHCP_ACK) {
mbed714	0:d616ece2d859	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
mbed714	0:d616ece2d859	1558	/* in requesting state? */
mbed714	0:d616ece2d859	1559	if (dhcp->state == DHCP_REQUESTING) {
mbed714	0:d616ece2d859	1560	dhcp_handle_ack(netif);
mbed714	0:d616ece2d859	1561	#if DHCP_DOES_ARP_CHECK
mbed714	0:d616ece2d859	1562	/* check if the acknowledged lease address is already in use */
mbed714	0:d616ece2d859	1563	dhcp_check(netif);
mbed714	0:d616ece2d859	1564	#else
mbed714	0:d616ece2d859	1565	/* bind interface to the acknowledged lease address */
mbed714	0:d616ece2d859	1566	dhcp_bind(netif);
mbed714	0:d616ece2d859	1567	#endif
mbed714	0:d616ece2d859	1568	}
mbed714	0:d616ece2d859	1569	/* already bound to the given lease address? */
mbed714	0:d616ece2d859	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
mbed714	0:d616ece2d859	1571	dhcp_bind(netif);
mbed714	0:d616ece2d859	1572	}
mbed714	0:d616ece2d859	1573	}
mbed714	0:d616ece2d859	1574	/* received a DHCP_NAK in appropriate state? */
mbed714	0:d616ece2d859	1575	else if ((msg_type == DHCP_NAK) &&
mbed714	0:d616ece2d859	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
mbed714	0:d616ece2d859	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
mbed714	0:d616ece2d859	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
mbed714	0:d616ece2d859	1579	dhcp_handle_nak(netif);
mbed714	0:d616ece2d859	1580	}
mbed714	0:d616ece2d859	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
mbed714	0:d616ece2d859	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
mbed714	0:d616ece2d859	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
mbed714	0:d616ece2d859	1584	dhcp->request_timeout = 0;
mbed714	0:d616ece2d859	1585	/* remember offered lease */
mbed714	0:d616ece2d859	1586	dhcp_handle_offer(netif);
mbed714	0:d616ece2d859	1587	}
mbed714	0:d616ece2d859	1588	free_pbuf_and_return:
mbed714	0:d616ece2d859	1589	dhcp->msg_in = NULL;
mbed714	0:d616ece2d859	1590	pbuf_free(p);
mbed714	0:d616ece2d859	1591	}
mbed714	0:d616ece2d859	1592
mbed714	0:d616ece2d859	1593	/**
mbed714	0:d616ece2d859	1594	* Create a DHCP request, fill in common headers
mbed714	0:d616ece2d859	1595	*
mbed714	0:d616ece2d859	1596	* @param netif the netif under DHCP control
mbed714	0:d616ece2d859	1597	* @param dhcp dhcp control struct
mbed714	0:d616ece2d859	1598	* @param message_type message type of the request
mbed714	0:d616ece2d859	1599	*/
mbed714	0:d616ece2d859	1600	static err_t
mbed714	0:d616ece2d859	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
mbed714	0:d616ece2d859	1602	{
mbed714	0:d616ece2d859	1603	u16_t i;
mbed714	0:d616ece2d859	1604	#ifndef DHCP_GLOBAL_XID
mbed714	0:d616ece2d859	1605	/** default global transaction identifier starting value (easy to match
mbed714	0:d616ece2d859	1606	* with a packet analyser). We simply increment for each new request.
mbed714	0:d616ece2d859	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
mbed714	0:d616ece2d859	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
mbed714	0:d616ece2d859	1609	static u32_t xid = 0xABCD0000;
mbed714	0:d616ece2d859	1610	#else
mbed714	0:d616ece2d859	1611	static u32_t xid;
mbed714	0:d616ece2d859	1612	static u8_t xid_initialised = 0;
mbed714	0:d616ece2d859	1613	if (!xid_initialised) {
mbed714	0:d616ece2d859	1614	xid = DHCP_GLOBAL_XID;
mbed714	0:d616ece2d859	1615	xid_initialised = !xid_initialised;
mbed714	0:d616ece2d859	1616	}
mbed714	0:d616ece2d859	1617	#endif
mbed714	0:d616ece2d859	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
mbed714	0:d616ece2d859	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
mbed714	0:d616ece2d859	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
mbed714	0:d616ece2d859	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
mbed714	0:d616ece2d859	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
mbed714	0:d616ece2d859	1623	if (dhcp->p_out == NULL) {
mbed714	0:d616ece2d859	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
mbed714	0:d616ece2d859	1626	return ERR_MEM;
mbed714	0:d616ece2d859	1627	}
mbed714	0:d616ece2d859	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
mbed714	0:d616ece2d859	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
mbed714	0:d616ece2d859	1630
mbed714	0:d616ece2d859	1631	/* reuse transaction identifier in retransmissions */
mbed714	0:d616ece2d859	1632	if (dhcp->tries == 0) {
mbed714	0:d616ece2d859	1633	xid++;
mbed714	0:d616ece2d859	1634	}
mbed714	0:d616ece2d859	1635	dhcp->xid = xid;
mbed714	0:d616ece2d859	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
mbed714	0:d616ece2d859	1637	("transaction id xid(%"X32_F")\n", xid));
mbed714	0:d616ece2d859	1638
mbed714	0:d616ece2d859	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
mbed714	0:d616ece2d859	1640
mbed714	0:d616ece2d859	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
mbed714	0:d616ece2d859	1642	/* TODO: make link layer independent */
mbed714	0:d616ece2d859	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
mbed714	0:d616ece2d859	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
mbed714	0:d616ece2d859	1645	dhcp->msg_out->hops = 0;
mbed714	0:d616ece2d859	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
mbed714	0:d616ece2d859	1647	dhcp->msg_out->secs = 0;
mbed714	0:d616ece2d859	1648	/* we don't need the broadcast flag since we can receive unicast traffic
mbed714	0:d616ece2d859	1649	before being fully configured! */
mbed714	0:d616ece2d859	1650	dhcp->msg_out->flags = 0;
mbed714	0:d616ece2d859	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
mbed714	0:d616ece2d859	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
mbed714	0:d616ece2d859	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
mbed714	0:d616ece2d859	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
mbed714	0:d616ece2d859	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
mbed714	0:d616ece2d859	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
mbed714	0:d616ece2d859	1657	}
mbed714	0:d616ece2d859	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
mbed714	0:d616ece2d859	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
mbed714	0:d616ece2d859	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
mbed714	0:d616ece2d859	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
mbed714	0:d616ece2d859	1662	/* copy netif hardware address, pad with zeroes */
mbed714	0:d616ece2d859	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
mbed714	0:d616ece2d859	1664	}
mbed714	0:d616ece2d859	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
mbed714	0:d616ece2d859	1666	dhcp->msg_out->sname[i] = 0;
mbed714	0:d616ece2d859	1667	}
mbed714	0:d616ece2d859	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
mbed714	0:d616ece2d859	1669	dhcp->msg_out->file[i] = 0;
mbed714	0:d616ece2d859	1670	}
mbed714	0:d616ece2d859	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
mbed714	0:d616ece2d859	1672	dhcp->options_out_len = 0;
mbed714	0:d616ece2d859	1673	/* fill options field with an incrementing array (for debugging purposes) */
mbed714	0:d616ece2d859	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
mbed714	0:d616ece2d859	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
mbed714	0:d616ece2d859	1676	}
mbed714	0:d616ece2d859	1677	/* Add option MESSAGE_TYPE */
mbed714	0:d616ece2d859	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
mbed714	0:d616ece2d859	1679	dhcp_option_byte(dhcp, message_type);
mbed714	0:d616ece2d859	1680	return ERR_OK;
mbed714	0:d616ece2d859	1681	}
mbed714	0:d616ece2d859	1682
mbed714	0:d616ece2d859	1683	/**
mbed714	0:d616ece2d859	1684	* Free previously allocated memory used to send a DHCP request.
mbed714	0:d616ece2d859	1685	*
mbed714	0:d616ece2d859	1686	* @param dhcp the dhcp struct to free the request from
mbed714	0:d616ece2d859	1687	*/
mbed714	0:d616ece2d859	1688	static void
mbed714	0:d616ece2d859	1689	dhcp_delete_msg(struct dhcp *dhcp)
mbed714	0:d616ece2d859	1690	{
mbed714	0:d616ece2d859	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
mbed714	0:d616ece2d859	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
mbed714	0:d616ece2d859	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
mbed714	0:d616ece2d859	1694	if (dhcp->p_out != NULL) {
mbed714	0:d616ece2d859	1695	pbuf_free(dhcp->p_out);
mbed714	0:d616ece2d859	1696	}
mbed714	0:d616ece2d859	1697	dhcp->p_out = NULL;
mbed714	0:d616ece2d859	1698	dhcp->msg_out = NULL;
mbed714	0:d616ece2d859	1699	}
mbed714	0:d616ece2d859	1700
mbed714	0:d616ece2d859	1701	/**
mbed714	0:d616ece2d859	1702	* Add a DHCP message trailer
mbed714	0:d616ece2d859	1703	*
mbed714	0:d616ece2d859	1704	* Adds the END option to the DHCP message, and if
mbed714	0:d616ece2d859	1705	* necessary, up to three padding bytes.
mbed714	0:d616ece2d859	1706	*
mbed714	0:d616ece2d859	1707	* @param dhcp DHCP state structure
mbed714	0:d616ece2d859	1708	*/
mbed714	0:d616ece2d859	1709	static void
mbed714	0:d616ece2d859	1710	dhcp_option_trailer(struct dhcp *dhcp)
mbed714	0:d616ece2d859	1711	{
mbed714	0:d616ece2d859	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
mbed714	0:d616ece2d859	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
mbed714	0:d616ece2d859	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
mbed714	0:d616ece2d859	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
mbed714	0:d616ece2d859	1716	/* packet is too small, or not 4 byte aligned? */
mbed714	0:d616ece2d859	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
mbed714	0:d616ece2d859	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)); */
mbed714	0:d616ece2d859	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
mbed714	0:d616ece2d859	1720	/* add a fill/padding byte */
mbed714	0:d616ece2d859	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
mbed714	0:d616ece2d859	1722	}
mbed714	0:d616ece2d859	1723	}
mbed714	0:d616ece2d859	1724
mbed714	0:d616ece2d859	1725	#endif /* LWIP_DHCP */

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Type:	Library
Created:	18 Sep 2010
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

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lwip/core/dhcp.c@0:d616ece2d859, 2010-09-18 (annotated)

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