ZG2100NetIfSource - ZG2100 Network interface source

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ZG2100 Network interface source

lwip/core/dhcp.c@4:e00281c7453d, 2010-08-06 (annotated)

Committer:: donatien
Date:: Fri Aug 06 10:46:03 2010 +0000
Revision:: 4:e00281c7453d
Parent:: 1:3a7c15057192

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:b802fc31f1db	1	/**
donatien	0:b802fc31f1db	2	* @file
donatien	0:b802fc31f1db	3	* Dynamic Host Configuration Protocol client
donatien	0:b802fc31f1db	4	*
donatien	0:b802fc31f1db	5	*/
donatien	0:b802fc31f1db	6
donatien	0:b802fc31f1db	7	/*
donatien	0:b802fc31f1db	8	*
donatien	0:b802fc31f1db	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
donatien	0:b802fc31f1db	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
donatien	0:b802fc31f1db	11	* All rights reserved.
donatien	0:b802fc31f1db	12	*
donatien	0:b802fc31f1db	13	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:b802fc31f1db	14	* are permitted provided that the following conditions are met:
donatien	0:b802fc31f1db	15	*
donatien	0:b802fc31f1db	16	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:b802fc31f1db	17	* this list of conditions and the following disclaimer.
donatien	0:b802fc31f1db	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:b802fc31f1db	19	* this list of conditions and the following disclaimer in the documentation
donatien	0:b802fc31f1db	20	* and/or other materials provided with the distribution.
donatien	0:b802fc31f1db	21	* 3. The name of the author may not be used to endorse or promote products
donatien	0:b802fc31f1db	22	* derived from this software without specific prior written permission.
donatien	0:b802fc31f1db	23	*
donatien	0:b802fc31f1db	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:b802fc31f1db	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:b802fc31f1db	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:b802fc31f1db	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:b802fc31f1db	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:b802fc31f1db	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:b802fc31f1db	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:b802fc31f1db	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:b802fc31f1db	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:b802fc31f1db	33	* OF SUCH DAMAGE.
donatien	0:b802fc31f1db	34	*
donatien	0:b802fc31f1db	35	* This file is a contribution to the lwIP TCP/IP stack.
donatien	0:b802fc31f1db	36	* The Swedish Institute of Computer Science and Adam Dunkels
donatien	0:b802fc31f1db	37	* are specifically granted permission to redistribute this
donatien	0:b802fc31f1db	38	* source code.
donatien	0:b802fc31f1db	39	*
donatien	0:b802fc31f1db	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
donatien	0:b802fc31f1db	41	*
donatien	0:b802fc31f1db	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
donatien	0:b802fc31f1db	43	* with RFC 2131 and RFC 2132.
donatien	0:b802fc31f1db	44	*
donatien	0:b802fc31f1db	45	* TODO:
donatien	0:b802fc31f1db	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
donatien	0:b802fc31f1db	47	*
donatien	0:b802fc31f1db	48	* Please coordinate changes and requests with Leon Woestenberg
donatien	0:b802fc31f1db	49	* <leon.woestenberg@gmx.net>
donatien	0:b802fc31f1db	50	*
donatien	0:b802fc31f1db	51	* Integration with your code:
donatien	0:b802fc31f1db	52	*
donatien	0:b802fc31f1db	53	* In lwip/dhcp.h
donatien	0:b802fc31f1db	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
donatien	0:b802fc31f1db	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
donatien	0:b802fc31f1db	56	*
donatien	0:b802fc31f1db	57	* Then have your application call dhcp_coarse_tmr() and
donatien	0:b802fc31f1db	58	* dhcp_fine_tmr() on the defined intervals.
donatien	0:b802fc31f1db	59	*
donatien	0:b802fc31f1db	60	* dhcp_start(struct netif *netif);
donatien	0:b802fc31f1db	61	* starts a DHCP client instance which configures the interface by
donatien	0:b802fc31f1db	62	* obtaining an IP address lease and maintaining it.
donatien	0:b802fc31f1db	63	*
donatien	0:b802fc31f1db	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
donatien	0:b802fc31f1db	65	* to remove the DHCP client.
donatien	0:b802fc31f1db	66	*
donatien	0:b802fc31f1db	67	*/
donatien	0:b802fc31f1db	68
donatien	0:b802fc31f1db	69	#include "lwip/opt.h"
donatien	0:b802fc31f1db	70
donatien	0:b802fc31f1db	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
donatien	0:b802fc31f1db	72
donatien	0:b802fc31f1db	73	#include "lwip/stats.h"
donatien	0:b802fc31f1db	74	#include "lwip/mem.h"
donatien	0:b802fc31f1db	75	#include "lwip/udp.h"
donatien	0:b802fc31f1db	76	#include "lwip/ip_addr.h"
donatien	0:b802fc31f1db	77	#include "lwip/netif.h"
donatien	0:b802fc31f1db	78	#include "lwip/def.h"
donatien	0:b802fc31f1db	79	#include "lwip/sys.h"
donatien	0:b802fc31f1db	80	#include "lwip/dhcp.h"
donatien	0:b802fc31f1db	81	#include "lwip/autoip.h"
donatien	0:b802fc31f1db	82	#include "lwip/dns.h"
donatien	0:b802fc31f1db	83	#include "netif/etharp.h"
donatien	0:b802fc31f1db	84
donatien	0:b802fc31f1db	85	#include <string.h>
donatien	0:b802fc31f1db	86
donatien	0:b802fc31f1db	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
donatien	0:b802fc31f1db	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
donatien	0:b802fc31f1db	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
donatien	0:b802fc31f1db	90	* #define DHCP_GLOBAL_XID rand()
donatien	0:b802fc31f1db	91	*/
donatien	0:b802fc31f1db	92	#ifdef DHCP_GLOBAL_XID_HEADER
donatien	0:b802fc31f1db	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
donatien	0:b802fc31f1db	94	#endif
donatien	0:b802fc31f1db	95
donatien	0:b802fc31f1db	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
donatien	0:b802fc31f1db	97	* MTU is checked to be big enough in dhcp_start */
donatien	0:b802fc31f1db	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
donatien	0:b802fc31f1db	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
donatien	0:b802fc31f1db	100	/** Minimum length for reply before packet is parsed */
donatien	0:b802fc31f1db	101	#define DHCP_MIN_REPLY_LEN 44
donatien	0:b802fc31f1db	102
donatien	0:b802fc31f1db	103	#define REBOOT_TRIES 2
donatien	0:b802fc31f1db	104
donatien	0:b802fc31f1db	105	/** Option handling: options are parsed in dhcp_parse_reply
donatien	0:b802fc31f1db	106	* and saved in an array where other functions can load them from.
donatien	0:b802fc31f1db	107	* This might be moved into the struct dhcp (not necessarily since
donatien	0:b802fc31f1db	108	* lwIP is single-threaded and the array is only used while in recv
donatien	0:b802fc31f1db	109	* callback). */
donatien	0:b802fc31f1db	110	#define DHCP_OPTION_IDX_OVERLOAD 0
donatien	0:b802fc31f1db	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
donatien	0:b802fc31f1db	112	#define DHCP_OPTION_IDX_SERVER_ID 2
donatien	0:b802fc31f1db	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
donatien	0:b802fc31f1db	114	#define DHCP_OPTION_IDX_T1 4
donatien	0:b802fc31f1db	115	#define DHCP_OPTION_IDX_T2 5
donatien	0:b802fc31f1db	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
donatien	0:b802fc31f1db	117	#define DHCP_OPTION_IDX_ROUTER 7
donatien	0:b802fc31f1db	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
donatien	0:b802fc31f1db	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
donatien	0:b802fc31f1db	120
donatien	0:b802fc31f1db	121	/** Holds the decoded option values, only valid while in dhcp_recv.
donatien	0:b802fc31f1db	122	@todo: move this into struct dhcp? */
donatien	0:b802fc31f1db	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
donatien	0:b802fc31f1db	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
donatien	0:b802fc31f1db	125	only valid while in dhcp_recv.
donatien	0:b802fc31f1db	126	@todo: move this into struct dhcp? */
donatien	0:b802fc31f1db	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
donatien	0:b802fc31f1db	128
donatien	0:b802fc31f1db	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
donatien	0:b802fc31f1db	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
donatien	0:b802fc31f1db	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
donatien	0:b802fc31f1db	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
donatien	0:b802fc31f1db	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
donatien	0:b802fc31f1db	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
donatien	0:b802fc31f1db	135
donatien	0:b802fc31f1db	136
donatien	0:b802fc31f1db	137	/* DHCP client state machine functions */
donatien	0:b802fc31f1db	138	static err_t dhcp_discover(struct netif *netif);
donatien	0:b802fc31f1db	139	static err_t dhcp_select(struct netif *netif);
donatien	0:b802fc31f1db	140	static void dhcp_bind(struct netif *netif);
donatien	0:b802fc31f1db	141	#if DHCP_DOES_ARP_CHECK
donatien	0:b802fc31f1db	142	static err_t dhcp_decline(struct netif *netif);
donatien	0:b802fc31f1db	143	#endif /* DHCP_DOES_ARP_CHECK */
donatien	0:b802fc31f1db	144	static err_t dhcp_rebind(struct netif *netif);
donatien	0:b802fc31f1db	145	static err_t dhcp_reboot(struct netif *netif);
donatien	0:b802fc31f1db	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
donatien	0:b802fc31f1db	147
donatien	0:b802fc31f1db	148	/* receive, unfold, parse and free incoming messages */
donatien	0:b802fc31f1db	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
donatien	0:b802fc31f1db	150
donatien	0:b802fc31f1db	151	/* set the DHCP timers */
donatien	0:b802fc31f1db	152	static void dhcp_timeout(struct netif *netif);
donatien	0:b802fc31f1db	153	static void dhcp_t1_timeout(struct netif *netif);
donatien	0:b802fc31f1db	154	static void dhcp_t2_timeout(struct netif *netif);
donatien	0:b802fc31f1db	155
donatien	0:b802fc31f1db	156	/* build outgoing messages */
donatien	0:b802fc31f1db	157	/* create a DHCP message, fill in common headers */
donatien	0:b802fc31f1db	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
donatien	0:b802fc31f1db	159	/* free a DHCP request */
donatien	0:b802fc31f1db	160	static void dhcp_delete_msg(struct dhcp *dhcp);
donatien	0:b802fc31f1db	161	/* add a DHCP option (type, then length in bytes) */
donatien	0:b802fc31f1db	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
donatien	0:b802fc31f1db	163	/* add option values */
donatien	0:b802fc31f1db	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
donatien	0:b802fc31f1db	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
donatien	0:b802fc31f1db	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
donatien	0:b802fc31f1db	167	/* always add the DHCP options trailer to end and pad */
donatien	0:b802fc31f1db	168	static void dhcp_option_trailer(struct dhcp *dhcp);
donatien	0:b802fc31f1db	169
donatien	0:b802fc31f1db	170	/**
donatien	0:b802fc31f1db	171	* Back-off the DHCP client (because of a received NAK response).
donatien	0:b802fc31f1db	172	*
donatien	0:b802fc31f1db	173	* Back-off the DHCP client because of a received NAK. Receiving a
donatien	0:b802fc31f1db	174	* NAK means the client asked for something non-sensible, for
donatien	0:b802fc31f1db	175	* example when it tries to renew a lease obtained on another network.
donatien	0:b802fc31f1db	176	*
donatien	0:b802fc31f1db	177	* We clear any existing set IP address and restart DHCP negotiation
donatien	0:b802fc31f1db	178	* afresh (as per RFC2131 3.2.3).
donatien	0:b802fc31f1db	179	*
donatien	0:b802fc31f1db	180	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	181	*/
donatien	0:b802fc31f1db	182	static void
donatien	0:b802fc31f1db	183	dhcp_handle_nak(struct netif *netif)
donatien	0:b802fc31f1db	184	{
donatien	0:b802fc31f1db	185	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
donatien	0:b802fc31f1db	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
donatien	0:b802fc31f1db	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
donatien	0:b802fc31f1db	189	netif_set_down(netif);
donatien	0:b802fc31f1db	190	/* remove IP address from interface */
donatien	0:b802fc31f1db	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
donatien	0:b802fc31f1db	192	netif_set_gw(netif, IP_ADDR_ANY);
donatien	0:b802fc31f1db	193	netif_set_netmask(netif, IP_ADDR_ANY);
donatien	0:b802fc31f1db	194	/* Change to a defined state */
donatien	0:b802fc31f1db	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
donatien	0:b802fc31f1db	196	/* We can immediately restart discovery */
donatien	0:b802fc31f1db	197	dhcp_discover(netif);
donatien	0:b802fc31f1db	198	}
donatien	0:b802fc31f1db	199
donatien	0:b802fc31f1db	200	#if DHCP_DOES_ARP_CHECK
donatien	0:b802fc31f1db	201	/**
donatien	0:b802fc31f1db	202	* Checks if the offered IP address is already in use.
donatien	0:b802fc31f1db	203	*
donatien	0:b802fc31f1db	204	* It does so by sending an ARP request for the offered address and
donatien	0:b802fc31f1db	205	* entering CHECKING state. If no ARP reply is received within a small
donatien	0:b802fc31f1db	206	* interval, the address is assumed to be free for use by us.
donatien	0:b802fc31f1db	207	*
donatien	0:b802fc31f1db	208	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	209	*/
donatien	0:b802fc31f1db	210	static void
donatien	0:b802fc31f1db	211	dhcp_check(struct netif *netif)
donatien	0:b802fc31f1db	212	{
donatien	0:b802fc31f1db	213	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	214	err_t result;
donatien	0:b802fc31f1db	215	u16_t msecs;
donatien	0:b802fc31f1db	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
donatien	0:b802fc31f1db	217	(s16_t)netif->name[1]));
donatien	0:b802fc31f1db	218	dhcp_set_state(dhcp, DHCP_CHECKING);
donatien	0:b802fc31f1db	219	/* create an ARP query for the offered IP address, expecting that no host
donatien	0:b802fc31f1db	220	responds, as the IP address should not be in use. */
donatien	0:b802fc31f1db	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
donatien	0:b802fc31f1db	222	if (result != ERR_OK) {
donatien	0:b802fc31f1db	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
donatien	0:b802fc31f1db	224	}
donatien	0:b802fc31f1db	225	dhcp->tries++;
donatien	0:b802fc31f1db	226	msecs = 500;
donatien	0:b802fc31f1db	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	229	}
donatien	0:b802fc31f1db	230	#endif /* DHCP_DOES_ARP_CHECK */
donatien	0:b802fc31f1db	231
donatien	0:b802fc31f1db	232	/**
donatien	0:b802fc31f1db	233	* Remember the configuration offered by a DHCP server.
donatien	0:b802fc31f1db	234	*
donatien	0:b802fc31f1db	235	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	236	*/
donatien	0:b802fc31f1db	237	static void
donatien	0:b802fc31f1db	238	dhcp_handle_offer(struct netif *netif)
donatien	0:b802fc31f1db	239	{
donatien	0:b802fc31f1db	240	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
donatien	0:b802fc31f1db	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
donatien	0:b802fc31f1db	243	/* obtain the server address */
donatien	0:b802fc31f1db	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
donatien	0:b802fc31f1db	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
donatien	0:b802fc31f1db	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
donatien	0:b802fc31f1db	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
donatien	0:b802fc31f1db	248	/* remember offered address */
donatien	0:b802fc31f1db	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
donatien	0:b802fc31f1db	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
donatien	0:b802fc31f1db	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien	0:b802fc31f1db	252
donatien	0:b802fc31f1db	253	dhcp_select(netif);
donatien	0:b802fc31f1db	254	} else {
donatien	0:b802fc31f1db	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
donatien	0:b802fc31f1db	257	}
donatien	0:b802fc31f1db	258	}
donatien	0:b802fc31f1db	259
donatien	0:b802fc31f1db	260	/**
donatien	0:b802fc31f1db	261	* Select a DHCP server offer out of all offers.
donatien	0:b802fc31f1db	262	*
donatien	0:b802fc31f1db	263	* Simply select the first offer received.
donatien	0:b802fc31f1db	264	*
donatien	0:b802fc31f1db	265	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	266	* @return lwIP specific error (see error.h)
donatien	0:b802fc31f1db	267	*/
donatien	0:b802fc31f1db	268	static err_t
donatien	0:b802fc31f1db	269	dhcp_select(struct netif *netif)
donatien	0:b802fc31f1db	270	{
donatien	0:b802fc31f1db	271	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	272	err_t result;
donatien	0:b802fc31f1db	273	u16_t msecs;
donatien	0:b802fc31f1db	274
donatien	0:b802fc31f1db	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));
donatien	0:b802fc31f1db	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
donatien	0:b802fc31f1db	277
donatien	0:b802fc31f1db	278	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien	0:b802fc31f1db	280	if (result == ERR_OK) {
donatien	0:b802fc31f1db	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien	0:b802fc31f1db	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien	0:b802fc31f1db	283
donatien	0:b802fc31f1db	284	/* MUST request the offered IP address */
donatien	0:b802fc31f1db	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien	0:b802fc31f1db	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien	0:b802fc31f1db	287
donatien	0:b802fc31f1db	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
donatien	0:b802fc31f1db	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
donatien	0:b802fc31f1db	290
donatien	0:b802fc31f1db	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
donatien	0:b802fc31f1db	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
donatien	0:b802fc31f1db	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
donatien	0:b802fc31f1db	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
donatien	0:b802fc31f1db	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
donatien	0:b802fc31f1db	296
donatien	0:b802fc31f1db	297	#if LWIP_NETIF_HOSTNAME
donatien	0:b802fc31f1db	298	if (netif->hostname != NULL) {
donatien	0:b802fc31f1db	299	const char p = (const char)netif->hostname;
donatien	0:b802fc31f1db	300	u8_t namelen = (u8_t)strlen(p);
donatien	0:b802fc31f1db	301	if (namelen > 0) {
donatien	0:b802fc31f1db	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
donatien	0:b802fc31f1db	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
donatien	0:b802fc31f1db	304	while (*p) {
donatien	0:b802fc31f1db	305	dhcp_option_byte(dhcp, *p++);
donatien	0:b802fc31f1db	306	}
donatien	0:b802fc31f1db	307	}
donatien	0:b802fc31f1db	308	}
donatien	0:b802fc31f1db	309	#endif /* LWIP_NETIF_HOSTNAME */
donatien	0:b802fc31f1db	310
donatien	0:b802fc31f1db	311	dhcp_option_trailer(dhcp);
donatien	0:b802fc31f1db	312	/* shrink the pbuf to the actual content length */
donatien	0:b802fc31f1db	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien	0:b802fc31f1db	314
donatien	0:b802fc31f1db	315	/* send broadcast to any DHCP server */
donatien	0:b802fc31f1db	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	317	dhcp_delete_msg(dhcp);
donatien	0:b802fc31f1db	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
donatien	0:b802fc31f1db	319	} else {
donatien	0:b802fc31f1db	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	321	}
donatien	0:b802fc31f1db	322	dhcp->tries++;
donatien	0:b802fc31f1db	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
donatien	0:b802fc31f1db	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	326	return result;
donatien	0:b802fc31f1db	327	}
donatien	0:b802fc31f1db	328
donatien	0:b802fc31f1db	329	/**
donatien	0:b802fc31f1db	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
donatien	0:b802fc31f1db	331	*/
donatien	0:b802fc31f1db	332	void
donatien	0:b802fc31f1db	333	dhcp_coarse_tmr()
donatien	0:b802fc31f1db	334	{
donatien	0:b802fc31f1db	335	struct netif *netif = netif_list;
donatien	0:b802fc31f1db	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
donatien	0:b802fc31f1db	337	/* iterate through all network interfaces */
donatien	0:b802fc31f1db	338	while (netif != NULL) {
donatien	0:b802fc31f1db	339	/* only act on DHCP configured interfaces */
donatien	0:b802fc31f1db	340	if (netif->dhcp != NULL) {
donatien	0:b802fc31f1db	341	/* timer is active (non zero), and triggers (zeroes) now? */
donatien	0:b802fc31f1db	342	if (netif->dhcp->t2_timeout-- == 1) {
donatien	0:b802fc31f1db	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
donatien	0:b802fc31f1db	344	/* this clients' rebind timeout triggered */
donatien	0:b802fc31f1db	345	dhcp_t2_timeout(netif);
donatien	0:b802fc31f1db	346	/* timer is active (non zero), and triggers (zeroes) now */
donatien	0:b802fc31f1db	347	} else if (netif->dhcp->t1_timeout-- == 1) {
donatien	0:b802fc31f1db	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
donatien	0:b802fc31f1db	349	/* this clients' renewal timeout triggered */
donatien	0:b802fc31f1db	350	dhcp_t1_timeout(netif);
donatien	0:b802fc31f1db	351	}
donatien	0:b802fc31f1db	352	}
donatien	0:b802fc31f1db	353	/* proceed to next netif */
donatien	0:b802fc31f1db	354	netif = netif->next;
donatien	0:b802fc31f1db	355	}
donatien	0:b802fc31f1db	356	}
donatien	0:b802fc31f1db	357
donatien	0:b802fc31f1db	358	/**
donatien	0:b802fc31f1db	359	* DHCP transaction timeout handling
donatien	0:b802fc31f1db	360	*
donatien	0:b802fc31f1db	361	* A DHCP server is expected to respond within a short period of time.
donatien	0:b802fc31f1db	362	* This timer checks whether an outstanding DHCP request is timed out.
donatien	0:b802fc31f1db	363	*/
donatien	0:b802fc31f1db	364	void
donatien	0:b802fc31f1db	365	dhcp_fine_tmr()
donatien	0:b802fc31f1db	366	{
donatien	0:b802fc31f1db	367	struct netif *netif = netif_list;
donatien	0:b802fc31f1db	368	/* loop through netif's */
donatien	0:b802fc31f1db	369	while (netif != NULL) {
donatien	0:b802fc31f1db	370	/* only act on DHCP configured interfaces */
donatien	0:b802fc31f1db	371	if (netif->dhcp != NULL) {
donatien	0:b802fc31f1db	372	/* timer is active (non zero), and is about to trigger now */
donatien	0:b802fc31f1db	373	if (netif->dhcp->request_timeout > 1) {
donatien	0:b802fc31f1db	374	netif->dhcp->request_timeout--;
donatien	0:b802fc31f1db	375	}
donatien	0:b802fc31f1db	376	else if (netif->dhcp->request_timeout == 1) {
donatien	0:b802fc31f1db	377	netif->dhcp->request_timeout--;
donatien	0:b802fc31f1db	378	/* { netif->dhcp->request_timeout == 0 } */
donatien	0:b802fc31f1db	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
donatien	0:b802fc31f1db	380	/* this client's request timeout triggered */
donatien	0:b802fc31f1db	381	dhcp_timeout(netif);
donatien	0:b802fc31f1db	382	}
donatien	0:b802fc31f1db	383	}
donatien	0:b802fc31f1db	384	/* proceed to next network interface */
donatien	0:b802fc31f1db	385	netif = netif->next;
donatien	0:b802fc31f1db	386	}
donatien	0:b802fc31f1db	387	}
donatien	0:b802fc31f1db	388
donatien	0:b802fc31f1db	389	/**
donatien	0:b802fc31f1db	390	* A DHCP negotiation transaction, or ARP request, has timed out.
donatien	0:b802fc31f1db	391	*
donatien	0:b802fc31f1db	392	* The timer that was started with the DHCP or ARP request has
donatien	0:b802fc31f1db	393	* timed out, indicating no response was received in time.
donatien	0:b802fc31f1db	394	*
donatien	0:b802fc31f1db	395	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	396	*/
donatien	0:b802fc31f1db	397	static void
donatien	0:b802fc31f1db	398	dhcp_timeout(struct netif *netif)
donatien	0:b802fc31f1db	399	{
donatien	0:b802fc31f1db	400	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
donatien	0:b802fc31f1db	402	/* back-off period has passed, or server selection timed out */
donatien	0:b802fc31f1db	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
donatien	0:b802fc31f1db	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
donatien	0:b802fc31f1db	405	dhcp_discover(netif);
donatien	0:b802fc31f1db	406	/* receiving the requested lease timed out */
donatien	0:b802fc31f1db	407	} else if (dhcp->state == DHCP_REQUESTING) {
donatien	0:b802fc31f1db	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
donatien	0:b802fc31f1db	409	if (dhcp->tries <= 5) {
donatien	0:b802fc31f1db	410	dhcp_select(netif);
donatien	0:b802fc31f1db	411	} else {
donatien	0:b802fc31f1db	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
donatien	0:b802fc31f1db	413	dhcp_release(netif);
donatien	0:b802fc31f1db	414	dhcp_discover(netif);
donatien	0:b802fc31f1db	415	}
donatien	0:b802fc31f1db	416	#if DHCP_DOES_ARP_CHECK
donatien	0:b802fc31f1db	417	/* received no ARP reply for the offered address (which is good) */
donatien	0:b802fc31f1db	418	} else if (dhcp->state == DHCP_CHECKING) {
donatien	0:b802fc31f1db	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
donatien	0:b802fc31f1db	420	if (dhcp->tries <= 1) {
donatien	0:b802fc31f1db	421	dhcp_check(netif);
donatien	0:b802fc31f1db	422	/* no ARP replies on the offered address,
donatien	0:b802fc31f1db	423	looks like the IP address is indeed free */
donatien	0:b802fc31f1db	424	} else {
donatien	0:b802fc31f1db	425	/* bind the interface to the offered address */
donatien	0:b802fc31f1db	426	dhcp_bind(netif);
donatien	0:b802fc31f1db	427	}
donatien	0:b802fc31f1db	428	#endif /* DHCP_DOES_ARP_CHECK */
donatien	0:b802fc31f1db	429	}
donatien	0:b802fc31f1db	430	/* did not get response to renew request? */
donatien	0:b802fc31f1db	431	else if (dhcp->state == DHCP_RENEWING) {
donatien	0:b802fc31f1db	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
donatien	0:b802fc31f1db	433	/* just retry renewal */
donatien	0:b802fc31f1db	434	/* note that the rebind timer will eventually time-out if renew does not work */
donatien	0:b802fc31f1db	435	dhcp_renew(netif);
donatien	0:b802fc31f1db	436	/* did not get response to rebind request? */
donatien	0:b802fc31f1db	437	} else if (dhcp->state == DHCP_REBINDING) {
donatien	0:b802fc31f1db	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
donatien	0:b802fc31f1db	439	if (dhcp->tries <= 8) {
donatien	0:b802fc31f1db	440	dhcp_rebind(netif);
donatien	0:b802fc31f1db	441	} else {
donatien	0:b802fc31f1db	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
donatien	0:b802fc31f1db	443	dhcp_release(netif);
donatien	0:b802fc31f1db	444	dhcp_discover(netif);
donatien	0:b802fc31f1db	445	}
donatien	0:b802fc31f1db	446	} else if (dhcp->state == DHCP_REBOOTING) {
donatien	0:b802fc31f1db	447	if (dhcp->tries < REBOOT_TRIES) {
donatien	0:b802fc31f1db	448	dhcp_reboot(netif);
donatien	0:b802fc31f1db	449	} else {
donatien	0:b802fc31f1db	450	dhcp_discover(netif);
donatien	0:b802fc31f1db	451	}
donatien	0:b802fc31f1db	452	}
donatien	0:b802fc31f1db	453	}
donatien	0:b802fc31f1db	454
donatien	0:b802fc31f1db	455	/**
donatien	0:b802fc31f1db	456	* The renewal period has timed out.
donatien	0:b802fc31f1db	457	*
donatien	0:b802fc31f1db	458	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	459	*/
donatien	0:b802fc31f1db	460	static void
donatien	0:b802fc31f1db	461	dhcp_t1_timeout(struct netif *netif)
donatien	0:b802fc31f1db	462	{
donatien	0:b802fc31f1db	463	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
donatien	0:b802fc31f1db	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
donatien	0:b802fc31f1db	466	(dhcp->state == DHCP_RENEWING)) {
donatien	0:b802fc31f1db	467	/* just retry to renew - note that the rebind timer (t2) will
donatien	0:b802fc31f1db	468	* eventually time-out if renew tries fail. */
donatien	0:b802fc31f1db	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
donatien	0:b802fc31f1db	470	("dhcp_t1_timeout(): must renew\n"));
donatien	0:b802fc31f1db	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
donatien	0:b802fc31f1db	472	DHCP_RENEWING, not DHCP_BOUND */
donatien	0:b802fc31f1db	473	dhcp_renew(netif);
donatien	0:b802fc31f1db	474	}
donatien	0:b802fc31f1db	475	}
donatien	0:b802fc31f1db	476
donatien	0:b802fc31f1db	477	/**
donatien	0:b802fc31f1db	478	* The rebind period has timed out.
donatien	0:b802fc31f1db	479	*
donatien	0:b802fc31f1db	480	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	481	*/
donatien	0:b802fc31f1db	482	static void
donatien	0:b802fc31f1db	483	dhcp_t2_timeout(struct netif *netif)
donatien	0:b802fc31f1db	484	{
donatien	0:b802fc31f1db	485	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
donatien	0:b802fc31f1db	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
donatien	0:b802fc31f1db	488	(dhcp->state == DHCP_RENEWING)) {
donatien	0:b802fc31f1db	489	/* just retry to rebind */
donatien	0:b802fc31f1db	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
donatien	0:b802fc31f1db	491	("dhcp_t2_timeout(): must rebind\n"));
donatien	0:b802fc31f1db	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
donatien	0:b802fc31f1db	493	DHCP_REBINDING, not DHCP_BOUND */
donatien	0:b802fc31f1db	494	dhcp_rebind(netif);
donatien	0:b802fc31f1db	495	}
donatien	0:b802fc31f1db	496	}
donatien	0:b802fc31f1db	497
donatien	0:b802fc31f1db	498	/**
donatien	0:b802fc31f1db	499	* Handle a DHCP ACK packet
donatien	0:b802fc31f1db	500	*
donatien	0:b802fc31f1db	501	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	502	*/
donatien	0:b802fc31f1db	503	static void
donatien	0:b802fc31f1db	504	dhcp_handle_ack(struct netif *netif)
donatien	0:b802fc31f1db	505	{
donatien	0:b802fc31f1db	506	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	507	#if LWIP_DNS
donatien	0:b802fc31f1db	508	u8_t n;
donatien	0:b802fc31f1db	509	#endif /* LWIP_DNS */
donatien	0:b802fc31f1db	510
donatien	0:b802fc31f1db	511	/* clear options we might not get from the ACK */
donatien	0:b802fc31f1db	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
donatien	0:b802fc31f1db	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
donatien	0:b802fc31f1db	514	#if LWIP_DHCP_BOOTP_FILE
donatien	0:b802fc31f1db	515	ip_addr_set_zero(&dhcp->offered_si_addr);
donatien	0:b802fc31f1db	516	#endif /* LWIP_DHCP_BOOTP_FILE */
donatien	0:b802fc31f1db	517
donatien	0:b802fc31f1db	518	/* lease time given? */
donatien	0:b802fc31f1db	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
donatien	0:b802fc31f1db	520	/* remember offered lease time */
donatien	0:b802fc31f1db	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
donatien	0:b802fc31f1db	522	}
donatien	0:b802fc31f1db	523	/* renewal period given? */
donatien	0:b802fc31f1db	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
donatien	0:b802fc31f1db	525	/* remember given renewal period */
donatien	0:b802fc31f1db	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
donatien	0:b802fc31f1db	527	} else {
donatien	0:b802fc31f1db	528	/* calculate safe periods for renewal */
donatien	0:b802fc31f1db	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
donatien	0:b802fc31f1db	530	}
donatien	0:b802fc31f1db	531
donatien	0:b802fc31f1db	532	/* renewal period given? */
donatien	0:b802fc31f1db	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
donatien	0:b802fc31f1db	534	/* remember given rebind period */
donatien	0:b802fc31f1db	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
donatien	0:b802fc31f1db	536	} else {
donatien	0:b802fc31f1db	537	/* calculate safe periods for rebinding */
donatien	0:b802fc31f1db	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
donatien	0:b802fc31f1db	539	}
donatien	0:b802fc31f1db	540
donatien	0:b802fc31f1db	541	/* (y)our internet address */
donatien	0:b802fc31f1db	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
donatien	0:b802fc31f1db	543
donatien	0:b802fc31f1db	544	#if LWIP_DHCP_BOOTP_FILE
donatien	0:b802fc31f1db	545	/* copy boot server address,
donatien	0:b802fc31f1db	546	boot file name copied in dhcp_parse_reply if not overloaded */
donatien	0:b802fc31f1db	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
donatien	0:b802fc31f1db	548	#endif /* LWIP_DHCP_BOOTP_FILE */
donatien	0:b802fc31f1db	549
donatien	0:b802fc31f1db	550	/* subnet mask given? */
donatien	0:b802fc31f1db	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
donatien	0:b802fc31f1db	552	/* remember given subnet mask */
donatien	0:b802fc31f1db	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
donatien	0:b802fc31f1db	554	dhcp->subnet_mask_given = 1;
donatien	0:b802fc31f1db	555	} else {
donatien	0:b802fc31f1db	556	dhcp->subnet_mask_given = 0;
donatien	0:b802fc31f1db	557	}
donatien	0:b802fc31f1db	558
donatien	0:b802fc31f1db	559	/* gateway router */
donatien	0:b802fc31f1db	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
donatien	0:b802fc31f1db	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
donatien	0:b802fc31f1db	562	}
donatien	0:b802fc31f1db	563
donatien	0:b802fc31f1db	564	#if LWIP_DNS
donatien	0:b802fc31f1db	565	/* DNS servers */
donatien	0:b802fc31f1db	566	n = 0;
donatien	0:b802fc31f1db	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
donatien	0:b802fc31f1db	568	ip_addr_t dns_addr;
donatien	0:b802fc31f1db	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
donatien	0:b802fc31f1db	570	dns_setserver(n, &dns_addr);
donatien	0:b802fc31f1db	571	n++;
donatien	0:b802fc31f1db	572	}
donatien	0:b802fc31f1db	573	#endif /* LWIP_DNS */
donatien	0:b802fc31f1db	574	}
donatien	0:b802fc31f1db	575
donatien	0:b802fc31f1db	576	/** Set a statically allocated struct dhcp to work with.
donatien	0:b802fc31f1db	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
donatien	0:b802fc31f1db	578	*
donatien	0:b802fc31f1db	579	* @param netif the netif for which to set the struct dhcp
donatien	0:b802fc31f1db	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
donatien	0:b802fc31f1db	581	*/
donatien	0:b802fc31f1db	582	void
donatien	0:b802fc31f1db	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
donatien	0:b802fc31f1db	584	{
donatien	0:b802fc31f1db	585	LWIP_ASSERT("netif != NULL", netif != NULL);
donatien	0:b802fc31f1db	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
donatien	0:b802fc31f1db	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
donatien	0:b802fc31f1db	588
donatien	0:b802fc31f1db	589	/* clear data structure */
donatien	0:b802fc31f1db	590	memset(dhcp, 0, sizeof(struct dhcp));
donatien	0:b802fc31f1db	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
donatien	0:b802fc31f1db	592	netif->dhcp = dhcp;
donatien	0:b802fc31f1db	593	}
donatien	0:b802fc31f1db	594
donatien	0:b802fc31f1db	595	/**
donatien	0:b802fc31f1db	596	* Start DHCP negotiation for a network interface.
donatien	0:b802fc31f1db	597	*
donatien	0:b802fc31f1db	598	* If no DHCP client instance was attached to this interface,
donatien	0:b802fc31f1db	599	* a new client is created first. If a DHCP client instance
donatien	0:b802fc31f1db	600	* was already present, it restarts negotiation.
donatien	0:b802fc31f1db	601	*
donatien	0:b802fc31f1db	602	* @param netif The lwIP network interface
donatien	0:b802fc31f1db	603	* @return lwIP error code
donatien	0:b802fc31f1db	604	* - ERR_OK - No error
donatien	0:b802fc31f1db	605	* - ERR_MEM - Out of memory
donatien	0:b802fc31f1db	606	*/
donatien	0:b802fc31f1db	607	err_t
donatien	0:b802fc31f1db	608	dhcp_start(struct netif *netif)
donatien	0:b802fc31f1db	609	{
donatien	0:b802fc31f1db	610	struct dhcp *dhcp;
donatien	0:b802fc31f1db	611	err_t result = ERR_OK;
donatien	0:b802fc31f1db	612
donatien	0:b802fc31f1db	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
donatien	0:b802fc31f1db	614	dhcp = netif->dhcp;
donatien	0:b802fc31f1db	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));
donatien	0:b802fc31f1db	616	/* Remove the flag that says this netif is handled by DHCP,
donatien	0:b802fc31f1db	617	it is set when we succeeded starting. */
donatien	0:b802fc31f1db	618	netif->flags &= ~NETIF_FLAG_DHCP;
donatien	0:b802fc31f1db	619
donatien	0:b802fc31f1db	620	/* check hwtype of the netif */
donatien	0:b802fc31f1db	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
donatien	0:b802fc31f1db	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
donatien	0:b802fc31f1db	623	return ERR_ARG;
donatien	0:b802fc31f1db	624	}
donatien	0:b802fc31f1db	625
donatien	0:b802fc31f1db	626	/* check MTU of the netif */
donatien	0:b802fc31f1db	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
donatien	0:b802fc31f1db	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
donatien	0:b802fc31f1db	629	return ERR_MEM;
donatien	0:b802fc31f1db	630	}
donatien	0:b802fc31f1db	631
donatien	0:b802fc31f1db	632	/* no DHCP client attached yet? */
donatien	0:b802fc31f1db	633	if (dhcp == NULL) {
donatien	0:b802fc31f1db	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
donatien	0:b802fc31f1db	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
donatien	0:b802fc31f1db	636	if (dhcp == NULL) {
donatien	0:b802fc31f1db	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
donatien	0:b802fc31f1db	638	return ERR_MEM;
donatien	0:b802fc31f1db	639	}
donatien	0:b802fc31f1db	640	/* store this dhcp client in the netif */
donatien	0:b802fc31f1db	641	netif->dhcp = dhcp;
donatien	0:b802fc31f1db	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
donatien	0:b802fc31f1db	643	/* already has DHCP client attached */
donatien	0:b802fc31f1db	644	} else {
donatien	0:b802fc31f1db	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
donatien	0:b802fc31f1db	646	if (dhcp->pcb != NULL) {
donatien	0:b802fc31f1db	647	udp_remove(dhcp->pcb);
donatien	0:b802fc31f1db	648	}
donatien	0:b802fc31f1db	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
donatien	0:b802fc31f1db	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
donatien	0:b802fc31f1db	651	}
donatien	0:b802fc31f1db	652
donatien	0:b802fc31f1db	653	/* clear data structure */
donatien	0:b802fc31f1db	654	memset(dhcp, 0, sizeof(struct dhcp));
donatien	0:b802fc31f1db	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
donatien	0:b802fc31f1db	656	/* allocate UDP PCB */
donatien	0:b802fc31f1db	657	dhcp->pcb = udp_new();
donatien	0:b802fc31f1db	658	if (dhcp->pcb == NULL) {
donatien	0:b802fc31f1db	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
donatien	0:b802fc31f1db	660	return ERR_MEM;
donatien	0:b802fc31f1db	661	}
donatien	0:b802fc31f1db	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
donatien	0:b802fc31f1db	663	/* set up local and remote port for the pcb */
donatien	0:b802fc31f1db	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
donatien	0:b802fc31f1db	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
donatien	0:b802fc31f1db	666	/* set up the recv callback and argument */
donatien	0:b802fc31f1db	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
donatien	0:b802fc31f1db	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
donatien	0:b802fc31f1db	669	/* (re)start the DHCP negotiation */
donatien	0:b802fc31f1db	670	result = dhcp_discover(netif);
donatien	0:b802fc31f1db	671	if (result != ERR_OK) {
donatien	0:b802fc31f1db	672	/* free resources allocated above */
donatien	0:b802fc31f1db	673	dhcp_stop(netif);
donatien	0:b802fc31f1db	674	return ERR_MEM;
donatien	0:b802fc31f1db	675	}
donatien	0:b802fc31f1db	676	/* Set the flag that says this netif is handled by DHCP. */
donatien	0:b802fc31f1db	677	netif->flags \|= NETIF_FLAG_DHCP;
donatien	0:b802fc31f1db	678	return result;
donatien	0:b802fc31f1db	679	}
donatien	0:b802fc31f1db	680
donatien	0:b802fc31f1db	681	/**
donatien	0:b802fc31f1db	682	* Inform a DHCP server of our manual configuration.
donatien	0:b802fc31f1db	683	*
donatien	0:b802fc31f1db	684	* This informs DHCP servers of our fixed IP address configuration
donatien	0:b802fc31f1db	685	* by sending an INFORM message. It does not involve DHCP address
donatien	0:b802fc31f1db	686	* configuration, it is just here to be nice to the network.
donatien	0:b802fc31f1db	687	*
donatien	0:b802fc31f1db	688	* @param netif The lwIP network interface
donatien	0:b802fc31f1db	689	*/
donatien	0:b802fc31f1db	690	void
donatien	0:b802fc31f1db	691	dhcp_inform(struct netif *netif)
donatien	0:b802fc31f1db	692	{
donatien	0:b802fc31f1db	693	struct dhcp dhcp;
donatien	0:b802fc31f1db	694	err_t result = ERR_OK;
donatien	0:b802fc31f1db	695	struct udp_pcb *pcb;
donatien	0:b802fc31f1db	696
donatien	0:b802fc31f1db	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:b802fc31f1db	698
donatien	0:b802fc31f1db	699	memset(&dhcp, 0, sizeof(struct dhcp));
donatien	0:b802fc31f1db	700	dhcp_set_state(&dhcp, DHCP_INFORM);
donatien	0:b802fc31f1db	701
donatien	0:b802fc31f1db	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
donatien	0:b802fc31f1db	703	/* re-use existing pcb */
donatien	0:b802fc31f1db	704	pcb = netif->dhcp->pcb;
donatien	0:b802fc31f1db	705	} else {
donatien	0:b802fc31f1db	706	pcb = udp_new();
donatien	0:b802fc31f1db	707	if (pcb == NULL) {
donatien	0:b802fc31f1db	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
donatien	0:b802fc31f1db	709	return;
donatien	0:b802fc31f1db	710	}
donatien	0:b802fc31f1db	711	dhcp.pcb = pcb;
donatien	0:b802fc31f1db	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
donatien	0:b802fc31f1db	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
donatien	0:b802fc31f1db	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
donatien	0:b802fc31f1db	715	}
donatien	0:b802fc31f1db	716	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
donatien	0:b802fc31f1db	718	if (result == ERR_OK) {
donatien	0:b802fc31f1db	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien	0:b802fc31f1db	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
donatien	0:b802fc31f1db	721
donatien	0:b802fc31f1db	722	dhcp_option_trailer(&dhcp);
donatien	0:b802fc31f1db	723
donatien	0:b802fc31f1db	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
donatien	0:b802fc31f1db	725
donatien	0:b802fc31f1db	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
donatien	0:b802fc31f1db	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	728	dhcp_delete_msg(&dhcp);
donatien	0:b802fc31f1db	729	} else {
donatien	0:b802fc31f1db	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	731	}
donatien	0:b802fc31f1db	732
donatien	0:b802fc31f1db	733	if (dhcp.pcb != NULL) {
donatien	0:b802fc31f1db	734	/* otherwise, the existing pcb was used */
donatien	0:b802fc31f1db	735	udp_remove(dhcp.pcb);
donatien	0:b802fc31f1db	736	}
donatien	0:b802fc31f1db	737	}
donatien	0:b802fc31f1db	738
donatien	0:b802fc31f1db	739	/** Handle a possible change in the network configuration.
donatien	0:b802fc31f1db	740	*
donatien	0:b802fc31f1db	741	* This enters the REBOOTING state to verify that the currently bound
donatien	0:b802fc31f1db	742	* address is still valid.
donatien	0:b802fc31f1db	743	*/
donatien	0:b802fc31f1db	744	void
donatien	0:b802fc31f1db	745	dhcp_network_changed(struct netif *netif)
donatien	0:b802fc31f1db	746	{
donatien	0:b802fc31f1db	747	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	748	if (!dhcp)
donatien	0:b802fc31f1db	749	return;
donatien	0:b802fc31f1db	750	switch (dhcp->state) {
donatien	0:b802fc31f1db	751	case DHCP_REBINDING:
donatien	0:b802fc31f1db	752	case DHCP_RENEWING:
donatien	0:b802fc31f1db	753	case DHCP_BOUND:
donatien	0:b802fc31f1db	754	case DHCP_REBOOTING:
donatien	0:b802fc31f1db	755	netif_set_down(netif);
donatien	0:b802fc31f1db	756	dhcp->tries = 0;
donatien	0:b802fc31f1db	757	dhcp_reboot(netif);
donatien	0:b802fc31f1db	758	break;
donatien	0:b802fc31f1db	759	case DHCP_OFF:
donatien	0:b802fc31f1db	760	/* stay off */
donatien	0:b802fc31f1db	761	break;
donatien	0:b802fc31f1db	762	default:
donatien	0:b802fc31f1db	763	dhcp->tries = 0;
donatien	1:3a7c15057192	764	#if LWIP_DHCP_AUTOIP_COOP
donatien	1:3a7c15057192	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
donatien	1:3a7c15057192	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
donatien	0:b802fc31f1db	767	dhcp_discover(netif);
donatien	0:b802fc31f1db	768	break;
donatien	0:b802fc31f1db	769	}
donatien	0:b802fc31f1db	770	}
donatien	0:b802fc31f1db	771
donatien	0:b802fc31f1db	772	#if DHCP_DOES_ARP_CHECK
donatien	0:b802fc31f1db	773	/**
donatien	0:b802fc31f1db	774	* Match an ARP reply with the offered IP address.
donatien	0:b802fc31f1db	775	*
donatien	0:b802fc31f1db	776	* @param netif the network interface on which the reply was received
donatien	0:b802fc31f1db	777	* @param addr The IP address we received a reply from
donatien	0:b802fc31f1db	778	*/
donatien	0:b802fc31f1db	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
donatien	0:b802fc31f1db	780	{
donatien	0:b802fc31f1db	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:b802fc31f1db	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
donatien	0:b802fc31f1db	783	/* is a DHCP client doing an ARP check? */
donatien	0:b802fc31f1db	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
donatien	0:b802fc31f1db	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
donatien	0:b802fc31f1db	786	ip4_addr_get_u32(addr)));
donatien	0:b802fc31f1db	787	/* did a host respond with the address we
donatien	0:b802fc31f1db	788	were offered by the DHCP server? */
donatien	0:b802fc31f1db	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
donatien	0:b802fc31f1db	790	/* we will not accept the offered address */
donatien	0:b802fc31f1db	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:b802fc31f1db	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
donatien	0:b802fc31f1db	793	dhcp_decline(netif);
donatien	0:b802fc31f1db	794	}
donatien	0:b802fc31f1db	795	}
donatien	0:b802fc31f1db	796	}
donatien	0:b802fc31f1db	797
donatien	0:b802fc31f1db	798	/**
donatien	0:b802fc31f1db	799	* Decline an offered lease.
donatien	0:b802fc31f1db	800	*
donatien	0:b802fc31f1db	801	* Tell the DHCP server we do not accept the offered address.
donatien	0:b802fc31f1db	802	* One reason to decline the lease is when we find out the address
donatien	0:b802fc31f1db	803	* is already in use by another host (through ARP).
donatien	0:b802fc31f1db	804	*
donatien	0:b802fc31f1db	805	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	806	*/
donatien	0:b802fc31f1db	807	static err_t
donatien	0:b802fc31f1db	808	dhcp_decline(struct netif *netif)
donatien	0:b802fc31f1db	809	{
donatien	0:b802fc31f1db	810	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	811	err_t result = ERR_OK;
donatien	0:b802fc31f1db	812	u16_t msecs;
donatien	0:b802fc31f1db	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
donatien	0:b802fc31f1db	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
donatien	0:b802fc31f1db	815	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
donatien	0:b802fc31f1db	817	if (result == ERR_OK) {
donatien	0:b802fc31f1db	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien	0:b802fc31f1db	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien	0:b802fc31f1db	820
donatien	0:b802fc31f1db	821	dhcp_option_trailer(dhcp);
donatien	0:b802fc31f1db	822	/* resize pbuf to reflect true size of options */
donatien	0:b802fc31f1db	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien	0:b802fc31f1db	824
donatien	0:b802fc31f1db	825	/* per section 4.4.4, broadcast DECLINE messages */
donatien	0:b802fc31f1db	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	827	dhcp_delete_msg(dhcp);
donatien	0:b802fc31f1db	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
donatien	0:b802fc31f1db	829	} else {
donatien	0:b802fc31f1db	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	831	("dhcp_decline: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	832	}
donatien	0:b802fc31f1db	833	dhcp->tries++;
donatien	0:b802fc31f1db	834	msecs = 10*1000;
donatien	0:b802fc31f1db	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	837	return result;
donatien	0:b802fc31f1db	838	}
donatien	0:b802fc31f1db	839	#endif /* DHCP_DOES_ARP_CHECK */
donatien	0:b802fc31f1db	840
donatien	0:b802fc31f1db	841
donatien	0:b802fc31f1db	842	/**
donatien	0:b802fc31f1db	843	* Start the DHCP process, discover a DHCP server.
donatien	0:b802fc31f1db	844	*
donatien	0:b802fc31f1db	845	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	846	*/
donatien	0:b802fc31f1db	847	static err_t
donatien	0:b802fc31f1db	848	dhcp_discover(struct netif *netif)
donatien	0:b802fc31f1db	849	{
donatien	0:b802fc31f1db	850	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	851	err_t result = ERR_OK;
donatien	0:b802fc31f1db	852	u16_t msecs;
donatien	0:b802fc31f1db	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
donatien	0:b802fc31f1db	854	ip_addr_set_any(&dhcp->offered_ip_addr);
donatien	0:b802fc31f1db	855	dhcp_set_state(dhcp, DHCP_SELECTING);
donatien	0:b802fc31f1db	856	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
donatien	0:b802fc31f1db	858	if (result == ERR_OK) {
donatien	0:b802fc31f1db	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
donatien	0:b802fc31f1db	860
donatien	0:b802fc31f1db	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien	0:b802fc31f1db	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien	0:b802fc31f1db	863
donatien	0:b802fc31f1db	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
donatien	0:b802fc31f1db	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
donatien	0:b802fc31f1db	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
donatien	0:b802fc31f1db	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
donatien	0:b802fc31f1db	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
donatien	0:b802fc31f1db	869
donatien	0:b802fc31f1db	870	dhcp_option_trailer(dhcp);
donatien	0:b802fc31f1db	871
donatien	0:b802fc31f1db	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
donatien	0:b802fc31f1db	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien	0:b802fc31f1db	874
donatien	0:b802fc31f1db	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
donatien	0:b802fc31f1db	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
donatien	0:b802fc31f1db	878	dhcp_delete_msg(dhcp);
donatien	0:b802fc31f1db	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
donatien	0:b802fc31f1db	880	} else {
donatien	0:b802fc31f1db	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	882	}
donatien	0:b802fc31f1db	883	dhcp->tries++;
donatien	0:b802fc31f1db	884	#if LWIP_DHCP_AUTOIP_COOP
donatien	0:b802fc31f1db	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
donatien	0:b802fc31f1db	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
donatien	0:b802fc31f1db	887	autoip_start(netif);
donatien	0:b802fc31f1db	888	}
donatien	0:b802fc31f1db	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
donatien	0:b802fc31f1db	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
donatien	0:b802fc31f1db	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	893	return result;
donatien	0:b802fc31f1db	894	}
donatien	0:b802fc31f1db	895
donatien	0:b802fc31f1db	896
donatien	0:b802fc31f1db	897	/**
donatien	0:b802fc31f1db	898	* Bind the interface to the offered IP address.
donatien	0:b802fc31f1db	899	*
donatien	0:b802fc31f1db	900	* @param netif network interface to bind to the offered address
donatien	0:b802fc31f1db	901	*/
donatien	0:b802fc31f1db	902	static void
donatien	0:b802fc31f1db	903	dhcp_bind(struct netif *netif)
donatien	0:b802fc31f1db	904	{
donatien	0:b802fc31f1db	905	u32_t timeout;
donatien	0:b802fc31f1db	906	struct dhcp *dhcp;
donatien	0:b802fc31f1db	907	ip_addr_t sn_mask, gw_addr;
donatien	0:b802fc31f1db	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
donatien	0:b802fc31f1db	909	dhcp = netif->dhcp;
donatien	0:b802fc31f1db	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
donatien	0:b802fc31f1db	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));
donatien	0:b802fc31f1db	912
donatien	0:b802fc31f1db	913	/* temporary DHCP lease? */
donatien	0:b802fc31f1db	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
donatien	0:b802fc31f1db	915	/* set renewal period timer */
donatien	0:b802fc31f1db	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
donatien	0:b802fc31f1db	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
donatien	0:b802fc31f1db	918	if(timeout > 0xffff) {
donatien	0:b802fc31f1db	919	timeout = 0xffff;
donatien	0:b802fc31f1db	920	}
donatien	0:b802fc31f1db	921	dhcp->t1_timeout = (u16_t)timeout;
donatien	0:b802fc31f1db	922	if (dhcp->t1_timeout == 0) {
donatien	0:b802fc31f1db	923	dhcp->t1_timeout = 1;
donatien	0:b802fc31f1db	924	}
donatien	0:b802fc31f1db	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));
donatien	0:b802fc31f1db	926	}
donatien	0:b802fc31f1db	927	/* set renewal period timer */
donatien	0:b802fc31f1db	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
donatien	0:b802fc31f1db	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
donatien	0:b802fc31f1db	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
donatien	0:b802fc31f1db	931	if(timeout > 0xffff) {
donatien	0:b802fc31f1db	932	timeout = 0xffff;
donatien	0:b802fc31f1db	933	}
donatien	0:b802fc31f1db	934	dhcp->t2_timeout = (u16_t)timeout;
donatien	0:b802fc31f1db	935	if (dhcp->t2_timeout == 0) {
donatien	0:b802fc31f1db	936	dhcp->t2_timeout = 1;
donatien	0:b802fc31f1db	937	}
donatien	0:b802fc31f1db	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));
donatien	0:b802fc31f1db	939	}
donatien	0:b802fc31f1db	940
donatien	0:b802fc31f1db	941	if (dhcp->subnet_mask_given) {
donatien	0:b802fc31f1db	942	/* copy offered network mask */
donatien	0:b802fc31f1db	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
donatien	0:b802fc31f1db	944	} else {
donatien	0:b802fc31f1db	945	/* subnet mask not given, choose a safe subnet mask given the network class */
donatien	0:b802fc31f1db	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
donatien	0:b802fc31f1db	947	if (first_octet <= 127) {
donatien	1:3a7c15057192	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
donatien	0:b802fc31f1db	949	} else if (first_octet >= 192) {
donatien	1:3a7c15057192	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
donatien	0:b802fc31f1db	951	} else {
donatien	1:3a7c15057192	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
donatien	0:b802fc31f1db	953	}
donatien	0:b802fc31f1db	954	}
donatien	0:b802fc31f1db	955
donatien	0:b802fc31f1db	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
donatien	0:b802fc31f1db	957	/* gateway address not given? */
donatien	0:b802fc31f1db	958	if (ip_addr_isany(&gw_addr)) {
donatien	0:b802fc31f1db	959	/* copy network address */
donatien	0:b802fc31f1db	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
donatien	0:b802fc31f1db	961	/* use first host address on network as gateway */
donatien	1:3a7c15057192	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
donatien	0:b802fc31f1db	963	}
donatien	0:b802fc31f1db	964
donatien	0:b802fc31f1db	965	#if LWIP_DHCP_AUTOIP_COOP
donatien	0:b802fc31f1db	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
donatien	0:b802fc31f1db	967	autoip_stop(netif);
donatien	0:b802fc31f1db	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
donatien	0:b802fc31f1db	969	}
donatien	0:b802fc31f1db	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
donatien	0:b802fc31f1db	971
donatien	0:b802fc31f1db	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
donatien	0:b802fc31f1db	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien	0:b802fc31f1db	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
donatien	0:b802fc31f1db	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
donatien	0:b802fc31f1db	976	ip4_addr_get_u32(&sn_mask)));
donatien	0:b802fc31f1db	977	netif_set_netmask(netif, &sn_mask);
donatien	0:b802fc31f1db	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
donatien	0:b802fc31f1db	979	ip4_addr_get_u32(&gw_addr)));
donatien	0:b802fc31f1db	980	netif_set_gw(netif, &gw_addr);
donatien	0:b802fc31f1db	981	/* bring the interface up */
donatien	0:b802fc31f1db	982	netif_set_up(netif);
donatien	0:b802fc31f1db	983	/* netif is now bound to DHCP leased address */
donatien	0:b802fc31f1db	984	dhcp_set_state(dhcp, DHCP_BOUND);
donatien	0:b802fc31f1db	985	}
donatien	0:b802fc31f1db	986
donatien	0:b802fc31f1db	987	/**
donatien	0:b802fc31f1db	988	* Renew an existing DHCP lease at the involved DHCP server.
donatien	0:b802fc31f1db	989	*
donatien	0:b802fc31f1db	990	* @param netif network interface which must renew its lease
donatien	0:b802fc31f1db	991	*/
donatien	0:b802fc31f1db	992	err_t
donatien	0:b802fc31f1db	993	dhcp_renew(struct netif *netif)
donatien	0:b802fc31f1db	994	{
donatien	0:b802fc31f1db	995	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	996	err_t result;
donatien	0:b802fc31f1db	997	u16_t msecs;
donatien	0:b802fc31f1db	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
donatien	0:b802fc31f1db	999	dhcp_set_state(dhcp, DHCP_RENEWING);
donatien	0:b802fc31f1db	1000
donatien	0:b802fc31f1db	1001	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien	0:b802fc31f1db	1003	if (result == ERR_OK) {
donatien	0:b802fc31f1db	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien	0:b802fc31f1db	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien	0:b802fc31f1db	1006
donatien	0:b802fc31f1db	1007	#if LWIP_NETIF_HOSTNAME
donatien	0:b802fc31f1db	1008	if (netif->hostname != NULL) {
donatien	0:b802fc31f1db	1009	const char p = (const char)netif->hostname;
donatien	0:b802fc31f1db	1010	u8_t namelen = (u8_t)strlen(p);
donatien	0:b802fc31f1db	1011	if (namelen > 0) {
donatien	0:b802fc31f1db	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
donatien	0:b802fc31f1db	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
donatien	0:b802fc31f1db	1014	while (*p) {
donatien	0:b802fc31f1db	1015	dhcp_option_byte(dhcp, *p++);
donatien	0:b802fc31f1db	1016	}
donatien	0:b802fc31f1db	1017	}
donatien	0:b802fc31f1db	1018	}
donatien	0:b802fc31f1db	1019	#endif /* LWIP_NETIF_HOSTNAME */
donatien	0:b802fc31f1db	1020
donatien	0:b802fc31f1db	1021	#if 0
donatien	0:b802fc31f1db	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien	0:b802fc31f1db	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
donatien	0:b802fc31f1db	1024	#endif
donatien	0:b802fc31f1db	1025
donatien	0:b802fc31f1db	1026	#if 0
donatien	0:b802fc31f1db	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
donatien	0:b802fc31f1db	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
donatien	0:b802fc31f1db	1029	#endif
donatien	0:b802fc31f1db	1030	/* append DHCP message trailer */
donatien	0:b802fc31f1db	1031	dhcp_option_trailer(dhcp);
donatien	0:b802fc31f1db	1032
donatien	0:b802fc31f1db	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien	0:b802fc31f1db	1034
donatien	0:b802fc31f1db	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	1036	dhcp_delete_msg(dhcp);
donatien	0:b802fc31f1db	1037
donatien	0:b802fc31f1db	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
donatien	0:b802fc31f1db	1039	} else {
donatien	0:b802fc31f1db	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	1041	}
donatien	0:b802fc31f1db	1042	dhcp->tries++;
donatien	0:b802fc31f1db	1043	/* back-off on retries, but to a maximum of 20 seconds */
donatien	0:b802fc31f1db	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
donatien	0:b802fc31f1db	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	1047	return result;
donatien	0:b802fc31f1db	1048	}
donatien	0:b802fc31f1db	1049
donatien	0:b802fc31f1db	1050	/**
donatien	0:b802fc31f1db	1051	* Rebind with a DHCP server for an existing DHCP lease.
donatien	0:b802fc31f1db	1052	*
donatien	0:b802fc31f1db	1053	* @param netif network interface which must rebind with a DHCP server
donatien	0:b802fc31f1db	1054	*/
donatien	0:b802fc31f1db	1055	static err_t
donatien	0:b802fc31f1db	1056	dhcp_rebind(struct netif *netif)
donatien	0:b802fc31f1db	1057	{
donatien	0:b802fc31f1db	1058	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	1059	err_t result;
donatien	0:b802fc31f1db	1060	u16_t msecs;
donatien	0:b802fc31f1db	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
donatien	0:b802fc31f1db	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
donatien	0:b802fc31f1db	1063
donatien	0:b802fc31f1db	1064	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien	0:b802fc31f1db	1066	if (result == ERR_OK) {
donatien	0:b802fc31f1db	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien	0:b802fc31f1db	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
donatien	0:b802fc31f1db	1069
donatien	0:b802fc31f1db	1070	#if LWIP_NETIF_HOSTNAME
donatien	0:b802fc31f1db	1071	if (netif->hostname != NULL) {
donatien	0:b802fc31f1db	1072	const char p = (const char)netif->hostname;
donatien	0:b802fc31f1db	1073	u8_t namelen = (u8_t)strlen(p);
donatien	0:b802fc31f1db	1074	if (namelen > 0) {
donatien	0:b802fc31f1db	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
donatien	0:b802fc31f1db	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
donatien	0:b802fc31f1db	1077	while (*p) {
donatien	0:b802fc31f1db	1078	dhcp_option_byte(dhcp, *p++);
donatien	0:b802fc31f1db	1079	}
donatien	0:b802fc31f1db	1080	}
donatien	0:b802fc31f1db	1081	}
donatien	0:b802fc31f1db	1082	#endif /* LWIP_NETIF_HOSTNAME */
donatien	0:b802fc31f1db	1083
donatien	0:b802fc31f1db	1084	#if 0
donatien	0:b802fc31f1db	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien	0:b802fc31f1db	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
donatien	0:b802fc31f1db	1087
donatien	0:b802fc31f1db	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
donatien	0:b802fc31f1db	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
donatien	0:b802fc31f1db	1090	#endif
donatien	0:b802fc31f1db	1091
donatien	0:b802fc31f1db	1092	dhcp_option_trailer(dhcp);
donatien	0:b802fc31f1db	1093
donatien	0:b802fc31f1db	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien	0:b802fc31f1db	1095
donatien	0:b802fc31f1db	1096	/* broadcast to server */
donatien	0:b802fc31f1db	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	1098	dhcp_delete_msg(dhcp);
donatien	0:b802fc31f1db	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
donatien	0:b802fc31f1db	1100	} else {
donatien	0:b802fc31f1db	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	1102	}
donatien	0:b802fc31f1db	1103	dhcp->tries++;
donatien	0:b802fc31f1db	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
donatien	0:b802fc31f1db	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	1107	return result;
donatien	0:b802fc31f1db	1108	}
donatien	0:b802fc31f1db	1109
donatien	0:b802fc31f1db	1110	/**
donatien	0:b802fc31f1db	1111	* Enter REBOOTING state to verify an existing lease
donatien	0:b802fc31f1db	1112	*
donatien	0:b802fc31f1db	1113	* @param netif network interface which must reboot
donatien	0:b802fc31f1db	1114	*/
donatien	0:b802fc31f1db	1115	static err_t
donatien	0:b802fc31f1db	1116	dhcp_reboot(struct netif *netif)
donatien	0:b802fc31f1db	1117	{
donatien	0:b802fc31f1db	1118	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	1119	err_t result;
donatien	0:b802fc31f1db	1120	u16_t msecs;
donatien	0:b802fc31f1db	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
donatien	0:b802fc31f1db	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
donatien	0:b802fc31f1db	1123
donatien	0:b802fc31f1db	1124	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
donatien	0:b802fc31f1db	1126	if (result == ERR_OK) {
donatien	0:b802fc31f1db	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
donatien	0:b802fc31f1db	1128	dhcp_option_short(dhcp, 576);
donatien	0:b802fc31f1db	1129
donatien	0:b802fc31f1db	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
donatien	0:b802fc31f1db	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
donatien	0:b802fc31f1db	1132
donatien	0:b802fc31f1db	1133	dhcp_option_trailer(dhcp);
donatien	0:b802fc31f1db	1134
donatien	0:b802fc31f1db	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien	0:b802fc31f1db	1136
donatien	0:b802fc31f1db	1137	/* broadcast to server */
donatien	0:b802fc31f1db	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	1139	dhcp_delete_msg(dhcp);
donatien	0:b802fc31f1db	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
donatien	0:b802fc31f1db	1141	} else {
donatien	0:b802fc31f1db	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	1143	}
donatien	0:b802fc31f1db	1144	dhcp->tries++;
donatien	0:b802fc31f1db	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
donatien	0:b802fc31f1db	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	1148	return result;
donatien	0:b802fc31f1db	1149	}
donatien	0:b802fc31f1db	1150
donatien	0:b802fc31f1db	1151
donatien	0:b802fc31f1db	1152	/**
donatien	0:b802fc31f1db	1153	* Release a DHCP lease.
donatien	0:b802fc31f1db	1154	*
donatien	0:b802fc31f1db	1155	* @param netif network interface which must release its lease
donatien	0:b802fc31f1db	1156	*/
donatien	0:b802fc31f1db	1157	err_t
donatien	0:b802fc31f1db	1158	dhcp_release(struct netif *netif)
donatien	0:b802fc31f1db	1159	{
donatien	0:b802fc31f1db	1160	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	1161	err_t result;
donatien	0:b802fc31f1db	1162	u16_t msecs;
donatien	0:b802fc31f1db	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
donatien	0:b802fc31f1db	1164
donatien	0:b802fc31f1db	1165	/* idle DHCP client */
donatien	0:b802fc31f1db	1166	dhcp_set_state(dhcp, DHCP_OFF);
donatien	0:b802fc31f1db	1167	/* clean old DHCP offer */
donatien	0:b802fc31f1db	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
donatien	0:b802fc31f1db	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
donatien	0:b802fc31f1db	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
donatien	0:b802fc31f1db	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
donatien	0:b802fc31f1db	1172	#if LWIP_DHCP_BOOTP_FILE
donatien	0:b802fc31f1db	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
donatien	0:b802fc31f1db	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
donatien	0:b802fc31f1db	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
donatien	0:b802fc31f1db	1176
donatien	0:b802fc31f1db	1177	/* create and initialize the DHCP message header */
donatien	0:b802fc31f1db	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
donatien	0:b802fc31f1db	1179	if (result == ERR_OK) {
donatien	0:b802fc31f1db	1180	dhcp_option_trailer(dhcp);
donatien	0:b802fc31f1db	1181
donatien	0:b802fc31f1db	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
donatien	0:b802fc31f1db	1183
donatien	0:b802fc31f1db	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
donatien	0:b802fc31f1db	1185	dhcp_delete_msg(dhcp);
donatien	0:b802fc31f1db	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
donatien	0:b802fc31f1db	1187	} else {
donatien	0:b802fc31f1db	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
donatien	0:b802fc31f1db	1189	}
donatien	0:b802fc31f1db	1190	dhcp->tries++;
donatien	0:b802fc31f1db	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
donatien	0:b802fc31f1db	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
donatien	0:b802fc31f1db	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
donatien	0:b802fc31f1db	1194	/* bring the interface down */
donatien	0:b802fc31f1db	1195	netif_set_down(netif);
donatien	0:b802fc31f1db	1196	/* remove IP address from interface */
donatien	0:b802fc31f1db	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
donatien	0:b802fc31f1db	1198	netif_set_gw(netif, IP_ADDR_ANY);
donatien	0:b802fc31f1db	1199	netif_set_netmask(netif, IP_ADDR_ANY);
donatien	0:b802fc31f1db	1200
donatien	0:b802fc31f1db	1201	return result;
donatien	0:b802fc31f1db	1202	}
donatien	0:b802fc31f1db	1203
donatien	0:b802fc31f1db	1204	/**
donatien	0:b802fc31f1db	1205	* Remove the DHCP client from the interface.
donatien	0:b802fc31f1db	1206	*
donatien	0:b802fc31f1db	1207	* @param netif The network interface to stop DHCP on
donatien	0:b802fc31f1db	1208	*/
donatien	0:b802fc31f1db	1209	void
donatien	0:b802fc31f1db	1210	dhcp_stop(struct netif *netif)
donatien	0:b802fc31f1db	1211	{
donatien	1:3a7c15057192	1212	struct dhcp *dhcp;
donatien	0:b802fc31f1db	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
donatien	1:3a7c15057192	1214	dhcp = netif->dhcp;
donatien	0:b802fc31f1db	1215	/* Remove the flag that says this netif is handled by DHCP. */
donatien	0:b802fc31f1db	1216	netif->flags &= ~NETIF_FLAG_DHCP;
donatien	0:b802fc31f1db	1217
donatien	0:b802fc31f1db	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
donatien	0:b802fc31f1db	1219	/* netif is DHCP configured? */
donatien	0:b802fc31f1db	1220	if (dhcp != NULL) {
donatien	0:b802fc31f1db	1221	#if LWIP_DHCP_AUTOIP_COOP
donatien	0:b802fc31f1db	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
donatien	0:b802fc31f1db	1223	autoip_stop(netif);
donatien	0:b802fc31f1db	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
donatien	0:b802fc31f1db	1225	}
donatien	0:b802fc31f1db	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
donatien	0:b802fc31f1db	1227
donatien	0:b802fc31f1db	1228	if (dhcp->pcb != NULL) {
donatien	0:b802fc31f1db	1229	udp_remove(dhcp->pcb);
donatien	0:b802fc31f1db	1230	dhcp->pcb = NULL;
donatien	0:b802fc31f1db	1231	}
donatien	0:b802fc31f1db	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
donatien	0:b802fc31f1db	1233	dhcp_set_state(dhcp, DHCP_OFF);
donatien	0:b802fc31f1db	1234	}
donatien	0:b802fc31f1db	1235	}
donatien	0:b802fc31f1db	1236
donatien	0:b802fc31f1db	1237	/*
donatien	0:b802fc31f1db	1238	* Set the DHCP state of a DHCP client.
donatien	0:b802fc31f1db	1239	*
donatien	0:b802fc31f1db	1240	* If the state changed, reset the number of tries.
donatien	0:b802fc31f1db	1241	*/
donatien	0:b802fc31f1db	1242	static void
donatien	0:b802fc31f1db	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
donatien	0:b802fc31f1db	1244	{
donatien	0:b802fc31f1db	1245	if (new_state != dhcp->state) {
donatien	0:b802fc31f1db	1246	dhcp->state = new_state;
donatien	0:b802fc31f1db	1247	dhcp->tries = 0;
donatien	0:b802fc31f1db	1248	dhcp->request_timeout = 0;
donatien	0:b802fc31f1db	1249	}
donatien	0:b802fc31f1db	1250	}
donatien	0:b802fc31f1db	1251
donatien	0:b802fc31f1db	1252	/*
donatien	0:b802fc31f1db	1253	* Concatenate an option type and length field to the outgoing
donatien	0:b802fc31f1db	1254	* DHCP message.
donatien	0:b802fc31f1db	1255	*
donatien	0:b802fc31f1db	1256	*/
donatien	0:b802fc31f1db	1257	static void
donatien	0:b802fc31f1db	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
donatien	0:b802fc31f1db	1259	{
donatien	0:b802fc31f1db	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);
donatien	0:b802fc31f1db	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
donatien	0:b802fc31f1db	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
donatien	0:b802fc31f1db	1263	}
donatien	0:b802fc31f1db	1264	/*
donatien	0:b802fc31f1db	1265	* Concatenate a single byte to the outgoing DHCP message.
donatien	0:b802fc31f1db	1266	*
donatien	0:b802fc31f1db	1267	*/
donatien	0:b802fc31f1db	1268	static void
donatien	0:b802fc31f1db	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
donatien	0:b802fc31f1db	1270	{
donatien	0:b802fc31f1db	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
donatien	0:b802fc31f1db	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
donatien	0:b802fc31f1db	1273	}
donatien	0:b802fc31f1db	1274
donatien	0:b802fc31f1db	1275	static void
donatien	0:b802fc31f1db	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
donatien	0:b802fc31f1db	1277	{
donatien	0:b802fc31f1db	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
donatien	0:b802fc31f1db	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
donatien	0:b802fc31f1db	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
donatien	0:b802fc31f1db	1281	}
donatien	0:b802fc31f1db	1282
donatien	0:b802fc31f1db	1283	static void
donatien	0:b802fc31f1db	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
donatien	0:b802fc31f1db	1285	{
donatien	0:b802fc31f1db	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
donatien	0:b802fc31f1db	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
donatien	0:b802fc31f1db	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
donatien	0:b802fc31f1db	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
donatien	0:b802fc31f1db	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
donatien	0:b802fc31f1db	1291	}
donatien	0:b802fc31f1db	1292
donatien	0:b802fc31f1db	1293	/**
donatien	0:b802fc31f1db	1294	* Extract the DHCP message and the DHCP options.
donatien	0:b802fc31f1db	1295	*
donatien	0:b802fc31f1db	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
donatien	0:b802fc31f1db	1297	* piece of memory. As a DHCP message is variable sized by its options,
donatien	0:b802fc31f1db	1298	* and also allows overriding some fields for options, the easy approach
donatien	0:b802fc31f1db	1299	* is to first unfold the options into a conitguous piece of memory, and
donatien	0:b802fc31f1db	1300	* use that further on.
donatien	0:b802fc31f1db	1301	*
donatien	0:b802fc31f1db	1302	*/
donatien	0:b802fc31f1db	1303	static err_t
donatien	0:b802fc31f1db	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
donatien	0:b802fc31f1db	1305	{
donatien	0:b802fc31f1db	1306	u8_t *options;
donatien	0:b802fc31f1db	1307	u16_t offset;
donatien	0:b802fc31f1db	1308	u16_t offset_max;
donatien	0:b802fc31f1db	1309	u16_t options_idx;
donatien	0:b802fc31f1db	1310	u16_t options_idx_max;
donatien	0:b802fc31f1db	1311	struct pbuf *q;
donatien	0:b802fc31f1db	1312	int parse_file_as_options = 0;
donatien	0:b802fc31f1db	1313	int parse_sname_as_options = 0;
donatien	0:b802fc31f1db	1314
donatien	0:b802fc31f1db	1315	/* clear received options */
donatien	0:b802fc31f1db	1316	dhcp_clear_all_options(dhcp);
donatien	0:b802fc31f1db	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
donatien	0:b802fc31f1db	1318	if (p->len < DHCP_SNAME_OFS) {
donatien	0:b802fc31f1db	1319	return ERR_BUF;
donatien	0:b802fc31f1db	1320	}
donatien	0:b802fc31f1db	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
donatien	0:b802fc31f1db	1322	#if LWIP_DHCP_BOOTP_FILE
donatien	0:b802fc31f1db	1323	/* clear boot file name */
donatien	0:b802fc31f1db	1324	dhcp->boot_file_name[0] = 0;
donatien	0:b802fc31f1db	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
donatien	0:b802fc31f1db	1326
donatien	0:b802fc31f1db	1327	/* parse options */
donatien	0:b802fc31f1db	1328
donatien	0:b802fc31f1db	1329	/* start with options field */
donatien	0:b802fc31f1db	1330	options_idx = DHCP_OPTIONS_OFS;
donatien	0:b802fc31f1db	1331	/* parse options to the end of the received packet */
donatien	0:b802fc31f1db	1332	options_idx_max = p->tot_len;
donatien	0:b802fc31f1db	1333	again:
donatien	0:b802fc31f1db	1334	q = p;
donatien	0:b802fc31f1db	1335	while((q != NULL) && (options_idx >= q->len)) {
donatien	0:b802fc31f1db	1336	options_idx -= q->len;
donatien	0:b802fc31f1db	1337	options_idx_max -= q->len;
donatien	0:b802fc31f1db	1338	q = q->next;
donatien	0:b802fc31f1db	1339	}
donatien	0:b802fc31f1db	1340	if (q == NULL) {
donatien	0:b802fc31f1db	1341	return ERR_BUF;
donatien	0:b802fc31f1db	1342	}
donatien	0:b802fc31f1db	1343	offset = options_idx;
donatien	0:b802fc31f1db	1344	offset_max = options_idx_max;
donatien	0:b802fc31f1db	1345	options = (u8_t*)q->payload;
donatien	0:b802fc31f1db	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
donatien	0:b802fc31f1db	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
donatien	0:b802fc31f1db	1348	u8_t op = options[offset];
donatien	0:b802fc31f1db	1349	u8_t len;
donatien	0:b802fc31f1db	1350	u8_t decode_len = 0;
donatien	0:b802fc31f1db	1351	int decode_idx = -1;
donatien	0:b802fc31f1db	1352	u16_t val_offset = offset + 2;
donatien	0:b802fc31f1db	1353	/* len byte might be in the next pbuf */
donatien	0:b802fc31f1db	1354	if (offset + 1 < q->len) {
donatien	0:b802fc31f1db	1355	len = options[offset + 1];
donatien	0:b802fc31f1db	1356	} else {
donatien	0:b802fc31f1db	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
donatien	0:b802fc31f1db	1358	}
donatien	0:b802fc31f1db	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
donatien	0:b802fc31f1db	1360	decode_len = len;
donatien	0:b802fc31f1db	1361	switch(op) {
donatien	0:b802fc31f1db	1362	/* case(DHCP_OPTION_END): handled above */
donatien	0:b802fc31f1db	1363	case(DHCP_OPTION_PAD):
donatien	0:b802fc31f1db	1364	/* special option: no len encoded */
donatien	0:b802fc31f1db	1365	decode_len = len = 0;
donatien	0:b802fc31f1db	1366	/* will be increased below */
donatien	0:b802fc31f1db	1367	offset--;
donatien	0:b802fc31f1db	1368	break;
donatien	0:b802fc31f1db	1369	case(DHCP_OPTION_SUBNET_MASK):
donatien	0:b802fc31f1db	1370	LWIP_ASSERT("len == 4", len == 4);
donatien	0:b802fc31f1db	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
donatien	0:b802fc31f1db	1372	break;
donatien	0:b802fc31f1db	1373	case(DHCP_OPTION_ROUTER):
donatien	0:b802fc31f1db	1374	decode_len = 4; /* only copy the first given router */
donatien	0:b802fc31f1db	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
donatien	0:b802fc31f1db	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
donatien	0:b802fc31f1db	1377	break;
donatien	0:b802fc31f1db	1378	case(DHCP_OPTION_DNS_SERVER):
donatien	0:b802fc31f1db	1379	/* special case: there might be more than one server */
donatien	0:b802fc31f1db	1380	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
donatien	0:b802fc31f1db	1381	/* limit number of DNS servers */
donatien	0:b802fc31f1db	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
donatien	0:b802fc31f1db	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
donatien	0:b802fc31f1db	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
donatien	0:b802fc31f1db	1385	break;
donatien	0:b802fc31f1db	1386	case(DHCP_OPTION_LEASE_TIME):
donatien	0:b802fc31f1db	1387	LWIP_ASSERT("len == 4", len == 4);
donatien	0:b802fc31f1db	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
donatien	0:b802fc31f1db	1389	break;
donatien	0:b802fc31f1db	1390	case(DHCP_OPTION_OVERLOAD):
donatien	0:b802fc31f1db	1391	LWIP_ASSERT("len == 1", len == 1);
donatien	0:b802fc31f1db	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
donatien	0:b802fc31f1db	1393	break;
donatien	0:b802fc31f1db	1394	case(DHCP_OPTION_MESSAGE_TYPE):
donatien	0:b802fc31f1db	1395	LWIP_ASSERT("len == 1", len == 1);
donatien	0:b802fc31f1db	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
donatien	0:b802fc31f1db	1397	break;
donatien	0:b802fc31f1db	1398	case(DHCP_OPTION_SERVER_ID):
donatien	0:b802fc31f1db	1399	LWIP_ASSERT("len == 4", len == 4);
donatien	0:b802fc31f1db	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
donatien	0:b802fc31f1db	1401	break;
donatien	0:b802fc31f1db	1402	case(DHCP_OPTION_T1):
donatien	0:b802fc31f1db	1403	LWIP_ASSERT("len == 4", len == 4);
donatien	0:b802fc31f1db	1404	decode_idx = DHCP_OPTION_IDX_T1;
donatien	0:b802fc31f1db	1405	break;
donatien	0:b802fc31f1db	1406	case(DHCP_OPTION_T2):
donatien	0:b802fc31f1db	1407	LWIP_ASSERT("len == 4", len == 4);
donatien	0:b802fc31f1db	1408	decode_idx = DHCP_OPTION_IDX_T2;
donatien	0:b802fc31f1db	1409	break;
donatien	0:b802fc31f1db	1410	default:
donatien	0:b802fc31f1db	1411	decode_len = 0;
donatien	0:b802fc31f1db	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
donatien	0:b802fc31f1db	1413	break;
donatien	0:b802fc31f1db	1414	}
donatien	0:b802fc31f1db	1415	offset += len + 2;
donatien	0:b802fc31f1db	1416	if (decode_len > 0) {
donatien	0:b802fc31f1db	1417	u32_t value = 0;
donatien	0:b802fc31f1db	1418	u16_t copy_len;
donatien	0:b802fc31f1db	1419	decode_next:
donatien	0:b802fc31f1db	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
donatien	0:b802fc31f1db	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
donatien	0:b802fc31f1db	1422	copy_len = LWIP_MIN(decode_len, 4);
donatien	0:b802fc31f1db	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
donatien	0:b802fc31f1db	1424	if (decode_len > 4) {
donatien	0:b802fc31f1db	1425	/* decode more than one u32_t */
donatien	0:b802fc31f1db	1426	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
donatien	0:b802fc31f1db	1427	dhcp_got_option(dhcp, decode_idx);
donatien	0:b802fc31f1db	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
donatien	0:b802fc31f1db	1429	decode_len -= 4;
donatien	0:b802fc31f1db	1430	val_offset += 4;
donatien	0:b802fc31f1db	1431	decode_idx++;
donatien	0:b802fc31f1db	1432	goto decode_next;
donatien	0:b802fc31f1db	1433	} else if (decode_len == 4) {
donatien	0:b802fc31f1db	1434	value = ntohl(value);
donatien	0:b802fc31f1db	1435	} else {
donatien	0:b802fc31f1db	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
donatien	1:3a7c15057192	1437	value = ((u8_t*)&value)[0];
donatien	0:b802fc31f1db	1438	}
donatien	1:3a7c15057192	1439	dhcp_got_option(dhcp, decode_idx);
donatien	1:3a7c15057192	1440	dhcp_set_option_value(dhcp, decode_idx, value);
donatien	0:b802fc31f1db	1441	}
donatien	0:b802fc31f1db	1442	if (offset >= q->len) {
donatien	0:b802fc31f1db	1443	offset -= q->len;
donatien	0:b802fc31f1db	1444	offset_max -= q->len;
donatien	0:b802fc31f1db	1445	q = q->next;
donatien	0:b802fc31f1db	1446	options = (u8_t*)q->payload;
donatien	0:b802fc31f1db	1447	}
donatien	0:b802fc31f1db	1448	}
donatien	0:b802fc31f1db	1449	/* is this an overloaded message? */
donatien	0:b802fc31f1db	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
donatien	0:b802fc31f1db	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
donatien	0:b802fc31f1db	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
donatien	0:b802fc31f1db	1453	if (overload == DHCP_OVERLOAD_FILE) {
donatien	0:b802fc31f1db	1454	parse_file_as_options = 1;
donatien	0:b802fc31f1db	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
donatien	0:b802fc31f1db	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
donatien	0:b802fc31f1db	1457	parse_sname_as_options = 1;
donatien	0:b802fc31f1db	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
donatien	0:b802fc31f1db	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
donatien	0:b802fc31f1db	1460	parse_sname_as_options = 1;
donatien	0:b802fc31f1db	1461	parse_file_as_options = 1;
donatien	0:b802fc31f1db	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
donatien	0:b802fc31f1db	1463	} else {
donatien	0:b802fc31f1db	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
donatien	0:b802fc31f1db	1465	}
donatien	0:b802fc31f1db	1466	#if LWIP_DHCP_BOOTP_FILE
donatien	0:b802fc31f1db	1467	if (!parse_file_as_options) {
donatien	0:b802fc31f1db	1468	/* only do this for ACK messages */
donatien	0:b802fc31f1db	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
donatien	0:b802fc31f1db	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
donatien	0:b802fc31f1db	1471	/* copy bootp file name, don't care for sname (server hostname) */
donatien	0:b802fc31f1db	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
donatien	0:b802fc31f1db	1473	/* make sure the string is really NULL-terminated */
donatien	0:b802fc31f1db	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
donatien	0:b802fc31f1db	1475	}
donatien	0:b802fc31f1db	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
donatien	0:b802fc31f1db	1477	}
donatien	0:b802fc31f1db	1478	if (parse_file_as_options) {
donatien	0:b802fc31f1db	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
donatien	0:b802fc31f1db	1480	parse_file_as_options = 0;
donatien	0:b802fc31f1db	1481	options_idx = DHCP_FILE_OFS;
donatien	0:b802fc31f1db	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
donatien	0:b802fc31f1db	1483	goto again;
donatien	0:b802fc31f1db	1484	} else if (parse_sname_as_options) {
donatien	0:b802fc31f1db	1485	parse_sname_as_options = 0;
donatien	0:b802fc31f1db	1486	options_idx = DHCP_SNAME_OFS;
donatien	0:b802fc31f1db	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
donatien	0:b802fc31f1db	1488	goto again;
donatien	0:b802fc31f1db	1489	}
donatien	0:b802fc31f1db	1490	return ERR_OK;
donatien	0:b802fc31f1db	1491	}
donatien	0:b802fc31f1db	1492
donatien	0:b802fc31f1db	1493	/**
donatien	0:b802fc31f1db	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
donatien	0:b802fc31f1db	1495	*/
donatien	0:b802fc31f1db	1496	static void
donatien	0:b802fc31f1db	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
donatien	0:b802fc31f1db	1498	{
donatien	0:b802fc31f1db	1499	struct netif netif = (struct netif )arg;
donatien	0:b802fc31f1db	1500	struct dhcp *dhcp = netif->dhcp;
donatien	0:b802fc31f1db	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
donatien	0:b802fc31f1db	1502	u8_t msg_type;
donatien	0:b802fc31f1db	1503	u8_t i;
donatien	0:b802fc31f1db	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,
donatien	0:b802fc31f1db	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
donatien	0:b802fc31f1db	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
donatien	0:b802fc31f1db	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
donatien	0:b802fc31f1db	1508	/* prevent warnings about unused arguments */
donatien	0:b802fc31f1db	1509	LWIP_UNUSED_ARG(pcb);
donatien	0:b802fc31f1db	1510	LWIP_UNUSED_ARG(addr);
donatien	0:b802fc31f1db	1511	LWIP_UNUSED_ARG(port);
donatien	0:b802fc31f1db	1512
donatien	0:b802fc31f1db	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
donatien	0:b802fc31f1db	1514
donatien	0:b802fc31f1db	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
donatien	0:b802fc31f1db	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
donatien	0:b802fc31f1db	1517	goto free_pbuf_and_return;
donatien	0:b802fc31f1db	1518	}
donatien	0:b802fc31f1db	1519
donatien	0:b802fc31f1db	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
donatien	0:b802fc31f1db	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));
donatien	0:b802fc31f1db	1522	goto free_pbuf_and_return;
donatien	0:b802fc31f1db	1523	}
donatien	0:b802fc31f1db	1524	/* iterate through hardware address and match against DHCP message */
donatien	0:b802fc31f1db	1525	for (i = 0; i < netif->hwaddr_len; i++) {
donatien	0:b802fc31f1db	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
donatien	0:b802fc31f1db	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:b802fc31f1db	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
donatien	0:b802fc31f1db	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
donatien	0:b802fc31f1db	1530	goto free_pbuf_and_return;
donatien	0:b802fc31f1db	1531	}
donatien	0:b802fc31f1db	1532	}
donatien	0:b802fc31f1db	1533	/* match transaction ID against what we expected */
donatien	0:b802fc31f1db	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
donatien	0:b802fc31f1db	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:b802fc31f1db	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
donatien	0:b802fc31f1db	1537	goto free_pbuf_and_return;
donatien	0:b802fc31f1db	1538	}
donatien	0:b802fc31f1db	1539	/* option fields could be unfold? */
donatien	0:b802fc31f1db	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
donatien	0:b802fc31f1db	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	1542	("problem unfolding DHCP message - too short on memory?\n"));
donatien	0:b802fc31f1db	1543	goto free_pbuf_and_return;
donatien	0:b802fc31f1db	1544	}
donatien	0:b802fc31f1db	1545
donatien	0:b802fc31f1db	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
donatien	0:b802fc31f1db	1547	/* obtain pointer to DHCP message type */
donatien	0:b802fc31f1db	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
donatien	0:b802fc31f1db	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
donatien	0:b802fc31f1db	1550	goto free_pbuf_and_return;
donatien	0:b802fc31f1db	1551	}
donatien	0:b802fc31f1db	1552
donatien	0:b802fc31f1db	1553	/* read DHCP message type */
donatien	0:b802fc31f1db	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
donatien	0:b802fc31f1db	1555	/* message type is DHCP ACK? */
donatien	0:b802fc31f1db	1556	if (msg_type == DHCP_ACK) {
donatien	0:b802fc31f1db	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
donatien	0:b802fc31f1db	1558	/* in requesting state? */
donatien	0:b802fc31f1db	1559	if (dhcp->state == DHCP_REQUESTING) {
donatien	0:b802fc31f1db	1560	dhcp_handle_ack(netif);
donatien	0:b802fc31f1db	1561	#if DHCP_DOES_ARP_CHECK
donatien	0:b802fc31f1db	1562	/* check if the acknowledged lease address is already in use */
donatien	0:b802fc31f1db	1563	dhcp_check(netif);
donatien	0:b802fc31f1db	1564	#else
donatien	0:b802fc31f1db	1565	/* bind interface to the acknowledged lease address */
donatien	0:b802fc31f1db	1566	dhcp_bind(netif);
donatien	0:b802fc31f1db	1567	#endif
donatien	0:b802fc31f1db	1568	}
donatien	0:b802fc31f1db	1569	/* already bound to the given lease address? */
donatien	0:b802fc31f1db	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
donatien	0:b802fc31f1db	1571	dhcp_bind(netif);
donatien	0:b802fc31f1db	1572	}
donatien	0:b802fc31f1db	1573	}
donatien	0:b802fc31f1db	1574	/* received a DHCP_NAK in appropriate state? */
donatien	0:b802fc31f1db	1575	else if ((msg_type == DHCP_NAK) &&
donatien	0:b802fc31f1db	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
donatien	0:b802fc31f1db	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
donatien	0:b802fc31f1db	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
donatien	0:b802fc31f1db	1579	dhcp_handle_nak(netif);
donatien	0:b802fc31f1db	1580	}
donatien	0:b802fc31f1db	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
donatien	0:b802fc31f1db	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
donatien	0:b802fc31f1db	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
donatien	0:b802fc31f1db	1584	dhcp->request_timeout = 0;
donatien	0:b802fc31f1db	1585	/* remember offered lease */
donatien	0:b802fc31f1db	1586	dhcp_handle_offer(netif);
donatien	0:b802fc31f1db	1587	}
donatien	0:b802fc31f1db	1588	free_pbuf_and_return:
donatien	0:b802fc31f1db	1589	dhcp->msg_in = NULL;
donatien	0:b802fc31f1db	1590	pbuf_free(p);
donatien	0:b802fc31f1db	1591	}
donatien	0:b802fc31f1db	1592
donatien	0:b802fc31f1db	1593	/**
donatien	0:b802fc31f1db	1594	* Create a DHCP request, fill in common headers
donatien	0:b802fc31f1db	1595	*
donatien	0:b802fc31f1db	1596	* @param netif the netif under DHCP control
donatien	0:b802fc31f1db	1597	* @param dhcp dhcp control struct
donatien	0:b802fc31f1db	1598	* @param message_type message type of the request
donatien	0:b802fc31f1db	1599	*/
donatien	0:b802fc31f1db	1600	static err_t
donatien	0:b802fc31f1db	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
donatien	0:b802fc31f1db	1602	{
donatien	0:b802fc31f1db	1603	u16_t i;
donatien	0:b802fc31f1db	1604	#ifndef DHCP_GLOBAL_XID
donatien	0:b802fc31f1db	1605	/** default global transaction identifier starting value (easy to match
donatien	0:b802fc31f1db	1606	* with a packet analyser). We simply increment for each new request.
donatien	0:b802fc31f1db	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
donatien	0:b802fc31f1db	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
donatien	0:b802fc31f1db	1609	static u32_t xid = 0xABCD0000;
donatien	0:b802fc31f1db	1610	#else
donatien	0:b802fc31f1db	1611	static u32_t xid;
donatien	0:b802fc31f1db	1612	static u8_t xid_initialised = 0;
donatien	0:b802fc31f1db	1613	if (!xid_initialised) {
donatien	0:b802fc31f1db	1614	xid = DHCP_GLOBAL_XID;
donatien	0:b802fc31f1db	1615	xid_initialised = !xid_initialised;
donatien	0:b802fc31f1db	1616	}
donatien	0:b802fc31f1db	1617	#endif
donatien	0:b802fc31f1db	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
donatien	0:b802fc31f1db	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
donatien	0:b802fc31f1db	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
donatien	0:b802fc31f1db	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
donatien	0:b802fc31f1db	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
donatien	0:b802fc31f1db	1623	if (dhcp->p_out == NULL) {
donatien	0:b802fc31f1db	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
donatien	0:b802fc31f1db	1626	return ERR_MEM;
donatien	0:b802fc31f1db	1627	}
donatien	0:b802fc31f1db	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
donatien	0:b802fc31f1db	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
donatien	0:b802fc31f1db	1630
donatien	0:b802fc31f1db	1631	/* reuse transaction identifier in retransmissions */
donatien	0:b802fc31f1db	1632	if (dhcp->tries == 0) {
donatien	0:b802fc31f1db	1633	xid++;
donatien	0:b802fc31f1db	1634	}
donatien	0:b802fc31f1db	1635	dhcp->xid = xid;
donatien	0:b802fc31f1db	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
donatien	0:b802fc31f1db	1637	("transaction id xid(%"X32_F")\n", xid));
donatien	0:b802fc31f1db	1638
donatien	0:b802fc31f1db	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
donatien	0:b802fc31f1db	1640
donatien	0:b802fc31f1db	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
donatien	0:b802fc31f1db	1642	/* TODO: make link layer independent */
donatien	0:b802fc31f1db	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
donatien	0:b802fc31f1db	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
donatien	0:b802fc31f1db	1645	dhcp->msg_out->hops = 0;
donatien	0:b802fc31f1db	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
donatien	0:b802fc31f1db	1647	dhcp->msg_out->secs = 0;
donatien	0:b802fc31f1db	1648	/* we don't need the broadcast flag since we can receive unicast traffic
donatien	0:b802fc31f1db	1649	before being fully configured! */
donatien	0:b802fc31f1db	1650	dhcp->msg_out->flags = 0;
donatien	0:b802fc31f1db	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
donatien	0:b802fc31f1db	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
donatien	0:b802fc31f1db	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
donatien	0:b802fc31f1db	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
donatien	0:b802fc31f1db	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
donatien	0:b802fc31f1db	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
donatien	0:b802fc31f1db	1657	}
donatien	0:b802fc31f1db	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
donatien	0:b802fc31f1db	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
donatien	0:b802fc31f1db	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
donatien	0:b802fc31f1db	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
donatien	0:b802fc31f1db	1662	/* copy netif hardware address, pad with zeroes */
donatien	0:b802fc31f1db	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
donatien	0:b802fc31f1db	1664	}
donatien	0:b802fc31f1db	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
donatien	0:b802fc31f1db	1666	dhcp->msg_out->sname[i] = 0;
donatien	0:b802fc31f1db	1667	}
donatien	0:b802fc31f1db	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
donatien	0:b802fc31f1db	1669	dhcp->msg_out->file[i] = 0;
donatien	0:b802fc31f1db	1670	}
donatien	1:3a7c15057192	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
donatien	0:b802fc31f1db	1672	dhcp->options_out_len = 0;
donatien	0:b802fc31f1db	1673	/* fill options field with an incrementing array (for debugging purposes) */
donatien	0:b802fc31f1db	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
donatien	0:b802fc31f1db	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
donatien	0:b802fc31f1db	1676	}
donatien	0:b802fc31f1db	1677	/* Add option MESSAGE_TYPE */
donatien	0:b802fc31f1db	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
donatien	0:b802fc31f1db	1679	dhcp_option_byte(dhcp, message_type);
donatien	0:b802fc31f1db	1680	return ERR_OK;
donatien	0:b802fc31f1db	1681	}
donatien	0:b802fc31f1db	1682
donatien	0:b802fc31f1db	1683	/**
donatien	0:b802fc31f1db	1684	* Free previously allocated memory used to send a DHCP request.
donatien	0:b802fc31f1db	1685	*
donatien	0:b802fc31f1db	1686	* @param dhcp the dhcp struct to free the request from
donatien	0:b802fc31f1db	1687	*/
donatien	0:b802fc31f1db	1688	static void
donatien	0:b802fc31f1db	1689	dhcp_delete_msg(struct dhcp *dhcp)
donatien	0:b802fc31f1db	1690	{
donatien	0:b802fc31f1db	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
donatien	0:b802fc31f1db	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
donatien	0:b802fc31f1db	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
donatien	0:b802fc31f1db	1694	if (dhcp->p_out != NULL) {
donatien	0:b802fc31f1db	1695	pbuf_free(dhcp->p_out);
donatien	0:b802fc31f1db	1696	}
donatien	0:b802fc31f1db	1697	dhcp->p_out = NULL;
donatien	0:b802fc31f1db	1698	dhcp->msg_out = NULL;
donatien	0:b802fc31f1db	1699	}
donatien	0:b802fc31f1db	1700
donatien	0:b802fc31f1db	1701	/**
donatien	0:b802fc31f1db	1702	* Add a DHCP message trailer
donatien	0:b802fc31f1db	1703	*
donatien	0:b802fc31f1db	1704	* Adds the END option to the DHCP message, and if
donatien	0:b802fc31f1db	1705	* necessary, up to three padding bytes.
donatien	0:b802fc31f1db	1706	*
donatien	0:b802fc31f1db	1707	* @param dhcp DHCP state structure
donatien	0:b802fc31f1db	1708	*/
donatien	0:b802fc31f1db	1709	static void
donatien	0:b802fc31f1db	1710	dhcp_option_trailer(struct dhcp *dhcp)
donatien	0:b802fc31f1db	1711	{
donatien	0:b802fc31f1db	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
donatien	0:b802fc31f1db	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
donatien	0:b802fc31f1db	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
donatien	0:b802fc31f1db	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
donatien	0:b802fc31f1db	1716	/* packet is too small, or not 4 byte aligned? */
donatien	0:b802fc31f1db	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
donatien	0:b802fc31f1db	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)); */
donatien	0:b802fc31f1db	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
donatien	0:b802fc31f1db	1720	/* add a fill/padding byte */
donatien	0:b802fc31f1db	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
donatien	0:b802fc31f1db	1722	}
donatien	0:b802fc31f1db	1723	}
donatien	0:b802fc31f1db	1724
donatien	0:b802fc31f1db	1725	#endif /* LWIP_DHCP */

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Type:	Program
Created:	09 Jul 2010
Imports:	20
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	3

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lwip/core/dhcp.c@4:e00281c7453d, 2010-08-06 (annotated)

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