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lwip/core/dhcp.c@7:4e2468d7d5cb, 2010-12-15 (annotated)

Committer:: segundo
Date:: Wed Dec 15 18:01:30 2010 +0000
Revision:: 7:4e2468d7d5cb
Parent:: 0:ac1725ba162c

Who changed what in which revision?

User	Revision	Line number	New contents of line
segundo	0:ac1725ba162c	1	/**
segundo	0:ac1725ba162c	2	* @file
segundo	0:ac1725ba162c	3	* Dynamic Host Configuration Protocol client
segundo	0:ac1725ba162c	4	*
segundo	0:ac1725ba162c	5	*/
segundo	0:ac1725ba162c	6
segundo	0:ac1725ba162c	7	/*
segundo	0:ac1725ba162c	8	*
segundo	0:ac1725ba162c	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
segundo	0:ac1725ba162c	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
segundo	0:ac1725ba162c	11	* All rights reserved.
segundo	0:ac1725ba162c	12	*
segundo	0:ac1725ba162c	13	* Redistribution and use in source and binary forms, with or without modification,
segundo	0:ac1725ba162c	14	* are permitted provided that the following conditions are met:
segundo	0:ac1725ba162c	15	*
segundo	0:ac1725ba162c	16	* 1. Redistributions of source code must retain the above copyright notice,
segundo	0:ac1725ba162c	17	* this list of conditions and the following disclaimer.
segundo	0:ac1725ba162c	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
segundo	0:ac1725ba162c	19	* this list of conditions and the following disclaimer in the documentation
segundo	0:ac1725ba162c	20	* and/or other materials provided with the distribution.
segundo	0:ac1725ba162c	21	* 3. The name of the author may not be used to endorse or promote products
segundo	0:ac1725ba162c	22	* derived from this software without specific prior written permission.
segundo	0:ac1725ba162c	23	*
segundo	0:ac1725ba162c	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
segundo	0:ac1725ba162c	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
segundo	0:ac1725ba162c	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
segundo	0:ac1725ba162c	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
segundo	0:ac1725ba162c	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
segundo	0:ac1725ba162c	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
segundo	0:ac1725ba162c	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
segundo	0:ac1725ba162c	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
segundo	0:ac1725ba162c	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
segundo	0:ac1725ba162c	33	* OF SUCH DAMAGE.
segundo	0:ac1725ba162c	34	*
segundo	0:ac1725ba162c	35	* This file is a contribution to the lwIP TCP/IP stack.
segundo	0:ac1725ba162c	36	* The Swedish Institute of Computer Science and Adam Dunkels
segundo	0:ac1725ba162c	37	* are specifically granted permission to redistribute this
segundo	0:ac1725ba162c	38	* source code.
segundo	0:ac1725ba162c	39	*
segundo	0:ac1725ba162c	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
segundo	0:ac1725ba162c	41	*
segundo	0:ac1725ba162c	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
segundo	0:ac1725ba162c	43	* with RFC 2131 and RFC 2132.
segundo	0:ac1725ba162c	44	*
segundo	0:ac1725ba162c	45	* TODO:
segundo	0:ac1725ba162c	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
segundo	0:ac1725ba162c	47	*
segundo	0:ac1725ba162c	48	* Please coordinate changes and requests with Leon Woestenberg
segundo	0:ac1725ba162c	49	* <leon.woestenberg@gmx.net>
segundo	0:ac1725ba162c	50	*
segundo	0:ac1725ba162c	51	* Integration with your code:
segundo	0:ac1725ba162c	52	*
segundo	0:ac1725ba162c	53	* In lwip/dhcp.h
segundo	0:ac1725ba162c	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
segundo	0:ac1725ba162c	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
segundo	0:ac1725ba162c	56	*
segundo	0:ac1725ba162c	57	* Then have your application call dhcp_coarse_tmr() and
segundo	0:ac1725ba162c	58	* dhcp_fine_tmr() on the defined intervals.
segundo	0:ac1725ba162c	59	*
segundo	0:ac1725ba162c	60	* dhcp_start(struct netif *netif);
segundo	0:ac1725ba162c	61	* starts a DHCP client instance which configures the interface by
segundo	0:ac1725ba162c	62	* obtaining an IP address lease and maintaining it.
segundo	0:ac1725ba162c	63	*
segundo	0:ac1725ba162c	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
segundo	0:ac1725ba162c	65	* to remove the DHCP client.
segundo	0:ac1725ba162c	66	*
segundo	0:ac1725ba162c	67	*/
segundo	0:ac1725ba162c	68
segundo	0:ac1725ba162c	69	#include "lwip/opt.h"
segundo	0:ac1725ba162c	70
segundo	0:ac1725ba162c	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
segundo	0:ac1725ba162c	72
segundo	0:ac1725ba162c	73	#include "lwip/stats.h"
segundo	0:ac1725ba162c	74	#include "lwip/mem.h"
segundo	0:ac1725ba162c	75	#include "lwip/udp.h"
segundo	0:ac1725ba162c	76	#include "lwip/ip_addr.h"
segundo	0:ac1725ba162c	77	#include "lwip/netif.h"
segundo	0:ac1725ba162c	78	#include "lwip/def.h"
segundo	0:ac1725ba162c	79	#include "lwip/sys.h"
segundo	0:ac1725ba162c	80	#include "lwip/dhcp.h"
segundo	0:ac1725ba162c	81	#include "lwip/autoip.h"
segundo	0:ac1725ba162c	82	#include "lwip/dns.h"
segundo	0:ac1725ba162c	83	#include "netif/etharp.h"
segundo	0:ac1725ba162c	84
segundo	0:ac1725ba162c	85	#include <string.h>
segundo	0:ac1725ba162c	86
segundo	0:ac1725ba162c	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
segundo	0:ac1725ba162c	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
segundo	0:ac1725ba162c	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
segundo	0:ac1725ba162c	90	* #define DHCP_GLOBAL_XID rand()
segundo	0:ac1725ba162c	91	*/
segundo	0:ac1725ba162c	92	#ifdef DHCP_GLOBAL_XID_HEADER
segundo	0:ac1725ba162c	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
segundo	0:ac1725ba162c	94	#endif
segundo	0:ac1725ba162c	95
segundo	0:ac1725ba162c	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
segundo	0:ac1725ba162c	97	* MTU is checked to be big enough in dhcp_start */
segundo	0:ac1725ba162c	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
segundo	0:ac1725ba162c	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
segundo	0:ac1725ba162c	100	/** Minimum length for reply before packet is parsed */
segundo	0:ac1725ba162c	101	#define DHCP_MIN_REPLY_LEN 44
segundo	0:ac1725ba162c	102
segundo	0:ac1725ba162c	103	#define REBOOT_TRIES 2
segundo	0:ac1725ba162c	104
segundo	0:ac1725ba162c	105	/** Option handling: options are parsed in dhcp_parse_reply
segundo	0:ac1725ba162c	106	* and saved in an array where other functions can load them from.
segundo	0:ac1725ba162c	107	* This might be moved into the struct dhcp (not necessarily since
segundo	0:ac1725ba162c	108	* lwIP is single-threaded and the array is only used while in recv
segundo	0:ac1725ba162c	109	* callback). */
segundo	0:ac1725ba162c	110	#define DHCP_OPTION_IDX_OVERLOAD 0
segundo	0:ac1725ba162c	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
segundo	0:ac1725ba162c	112	#define DHCP_OPTION_IDX_SERVER_ID 2
segundo	0:ac1725ba162c	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
segundo	0:ac1725ba162c	114	#define DHCP_OPTION_IDX_T1 4
segundo	0:ac1725ba162c	115	#define DHCP_OPTION_IDX_T2 5
segundo	0:ac1725ba162c	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
segundo	0:ac1725ba162c	117	#define DHCP_OPTION_IDX_ROUTER 7
segundo	0:ac1725ba162c	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
segundo	0:ac1725ba162c	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
segundo	0:ac1725ba162c	120
segundo	0:ac1725ba162c	121	/** Holds the decoded option values, only valid while in dhcp_recv.
segundo	0:ac1725ba162c	122	@todo: move this into struct dhcp? */
segundo	0:ac1725ba162c	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
segundo	0:ac1725ba162c	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
segundo	0:ac1725ba162c	125	only valid while in dhcp_recv.
segundo	0:ac1725ba162c	126	@todo: move this into struct dhcp? */
segundo	0:ac1725ba162c	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
segundo	0:ac1725ba162c	128
segundo	0:ac1725ba162c	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
segundo	0:ac1725ba162c	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
segundo	0:ac1725ba162c	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
segundo	0:ac1725ba162c	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
segundo	0:ac1725ba162c	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
segundo	0:ac1725ba162c	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
segundo	0:ac1725ba162c	135
segundo	0:ac1725ba162c	136
segundo	0:ac1725ba162c	137	/* DHCP client state machine functions */
segundo	0:ac1725ba162c	138	static err_t dhcp_discover(struct netif *netif);
segundo	0:ac1725ba162c	139	static err_t dhcp_select(struct netif *netif);
segundo	0:ac1725ba162c	140	static void dhcp_bind(struct netif *netif);
segundo	0:ac1725ba162c	141	#if DHCP_DOES_ARP_CHECK
segundo	0:ac1725ba162c	142	static err_t dhcp_decline(struct netif *netif);
segundo	0:ac1725ba162c	143	#endif /* DHCP_DOES_ARP_CHECK */
segundo	0:ac1725ba162c	144	static err_t dhcp_rebind(struct netif *netif);
segundo	0:ac1725ba162c	145	static err_t dhcp_reboot(struct netif *netif);
segundo	0:ac1725ba162c	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
segundo	0:ac1725ba162c	147
segundo	0:ac1725ba162c	148	/* receive, unfold, parse and free incoming messages */
segundo	0:ac1725ba162c	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
segundo	0:ac1725ba162c	150
segundo	0:ac1725ba162c	151	/* set the DHCP timers */
segundo	0:ac1725ba162c	152	static void dhcp_timeout(struct netif *netif);
segundo	0:ac1725ba162c	153	static void dhcp_t1_timeout(struct netif *netif);
segundo	0:ac1725ba162c	154	static void dhcp_t2_timeout(struct netif *netif);
segundo	0:ac1725ba162c	155
segundo	0:ac1725ba162c	156	/* build outgoing messages */
segundo	0:ac1725ba162c	157	/* create a DHCP message, fill in common headers */
segundo	0:ac1725ba162c	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
segundo	0:ac1725ba162c	159	/* free a DHCP request */
segundo	0:ac1725ba162c	160	static void dhcp_delete_msg(struct dhcp *dhcp);
segundo	0:ac1725ba162c	161	/* add a DHCP option (type, then length in bytes) */
segundo	0:ac1725ba162c	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
segundo	0:ac1725ba162c	163	/* add option values */
segundo	0:ac1725ba162c	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
segundo	0:ac1725ba162c	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
segundo	0:ac1725ba162c	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
segundo	0:ac1725ba162c	167	/* always add the DHCP options trailer to end and pad */
segundo	0:ac1725ba162c	168	static void dhcp_option_trailer(struct dhcp *dhcp);
segundo	0:ac1725ba162c	169
segundo	0:ac1725ba162c	170	/**
segundo	0:ac1725ba162c	171	* Back-off the DHCP client (because of a received NAK response).
segundo	0:ac1725ba162c	172	*
segundo	0:ac1725ba162c	173	* Back-off the DHCP client because of a received NAK. Receiving a
segundo	0:ac1725ba162c	174	* NAK means the client asked for something non-sensible, for
segundo	0:ac1725ba162c	175	* example when it tries to renew a lease obtained on another network.
segundo	0:ac1725ba162c	176	*
segundo	0:ac1725ba162c	177	* We clear any existing set IP address and restart DHCP negotiation
segundo	0:ac1725ba162c	178	* afresh (as per RFC2131 3.2.3).
segundo	0:ac1725ba162c	179	*
segundo	0:ac1725ba162c	180	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	181	*/
segundo	0:ac1725ba162c	182	static void
segundo	0:ac1725ba162c	183	dhcp_handle_nak(struct netif *netif)
segundo	0:ac1725ba162c	184	{
segundo	0:ac1725ba162c	185	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
segundo	0:ac1725ba162c	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
segundo	0:ac1725ba162c	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
segundo	0:ac1725ba162c	189	netif_set_down(netif);
segundo	0:ac1725ba162c	190	/* remove IP address from interface */
segundo	0:ac1725ba162c	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
segundo	0:ac1725ba162c	192	netif_set_gw(netif, IP_ADDR_ANY);
segundo	0:ac1725ba162c	193	netif_set_netmask(netif, IP_ADDR_ANY);
segundo	0:ac1725ba162c	194	/* Change to a defined state */
segundo	0:ac1725ba162c	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
segundo	0:ac1725ba162c	196	/* We can immediately restart discovery */
segundo	0:ac1725ba162c	197	dhcp_discover(netif);
segundo	0:ac1725ba162c	198	}
segundo	0:ac1725ba162c	199
segundo	0:ac1725ba162c	200	#if DHCP_DOES_ARP_CHECK
segundo	0:ac1725ba162c	201	/**
segundo	0:ac1725ba162c	202	* Checks if the offered IP address is already in use.
segundo	0:ac1725ba162c	203	*
segundo	0:ac1725ba162c	204	* It does so by sending an ARP request for the offered address and
segundo	0:ac1725ba162c	205	* entering CHECKING state. If no ARP reply is received within a small
segundo	0:ac1725ba162c	206	* interval, the address is assumed to be free for use by us.
segundo	0:ac1725ba162c	207	*
segundo	0:ac1725ba162c	208	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	209	*/
segundo	0:ac1725ba162c	210	static void
segundo	0:ac1725ba162c	211	dhcp_check(struct netif *netif)
segundo	0:ac1725ba162c	212	{
segundo	0:ac1725ba162c	213	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	214	err_t result;
segundo	0:ac1725ba162c	215	u16_t msecs;
segundo	0:ac1725ba162c	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
segundo	0:ac1725ba162c	217	(s16_t)netif->name[1]));
segundo	0:ac1725ba162c	218	dhcp_set_state(dhcp, DHCP_CHECKING);
segundo	0:ac1725ba162c	219	/* create an ARP query for the offered IP address, expecting that no host
segundo	0:ac1725ba162c	220	responds, as the IP address should not be in use. */
segundo	0:ac1725ba162c	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
segundo	0:ac1725ba162c	222	if (result != ERR_OK) {
segundo	0:ac1725ba162c	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
segundo	0:ac1725ba162c	224	}
segundo	0:ac1725ba162c	225	dhcp->tries++;
segundo	0:ac1725ba162c	226	msecs = 500;
segundo	0:ac1725ba162c	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	229	}
segundo	0:ac1725ba162c	230	#endif /* DHCP_DOES_ARP_CHECK */
segundo	0:ac1725ba162c	231
segundo	0:ac1725ba162c	232	/**
segundo	0:ac1725ba162c	233	* Remember the configuration offered by a DHCP server.
segundo	0:ac1725ba162c	234	*
segundo	0:ac1725ba162c	235	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	236	*/
segundo	0:ac1725ba162c	237	static void
segundo	0:ac1725ba162c	238	dhcp_handle_offer(struct netif *netif)
segundo	0:ac1725ba162c	239	{
segundo	0:ac1725ba162c	240	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
segundo	0:ac1725ba162c	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
segundo	0:ac1725ba162c	243	/* obtain the server address */
segundo	0:ac1725ba162c	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
segundo	0:ac1725ba162c	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
segundo	0:ac1725ba162c	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
segundo	0:ac1725ba162c	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
segundo	0:ac1725ba162c	248	/* remember offered address */
segundo	0:ac1725ba162c	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
segundo	0:ac1725ba162c	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
segundo	0:ac1725ba162c	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo	0:ac1725ba162c	252
segundo	0:ac1725ba162c	253	dhcp_select(netif);
segundo	0:ac1725ba162c	254	} else {
segundo	0:ac1725ba162c	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
segundo	0:ac1725ba162c	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
segundo	0:ac1725ba162c	257	}
segundo	0:ac1725ba162c	258	}
segundo	0:ac1725ba162c	259
segundo	0:ac1725ba162c	260	/**
segundo	0:ac1725ba162c	261	* Select a DHCP server offer out of all offers.
segundo	0:ac1725ba162c	262	*
segundo	0:ac1725ba162c	263	* Simply select the first offer received.
segundo	0:ac1725ba162c	264	*
segundo	0:ac1725ba162c	265	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	266	* @return lwIP specific error (see error.h)
segundo	0:ac1725ba162c	267	*/
segundo	0:ac1725ba162c	268	static err_t
segundo	0:ac1725ba162c	269	dhcp_select(struct netif *netif)
segundo	0:ac1725ba162c	270	{
segundo	0:ac1725ba162c	271	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	272	err_t result;
segundo	0:ac1725ba162c	273	u16_t msecs;
segundo	0:ac1725ba162c	274
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
segundo	0:ac1725ba162c	277
segundo	0:ac1725ba162c	278	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo	0:ac1725ba162c	280	if (result == ERR_OK) {
segundo	0:ac1725ba162c	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo	0:ac1725ba162c	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo	0:ac1725ba162c	283
segundo	0:ac1725ba162c	284	/* MUST request the offered IP address */
segundo	0:ac1725ba162c	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo	0:ac1725ba162c	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo	0:ac1725ba162c	287
segundo	0:ac1725ba162c	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
segundo	0:ac1725ba162c	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
segundo	0:ac1725ba162c	290
segundo	0:ac1725ba162c	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
segundo	0:ac1725ba162c	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
segundo	0:ac1725ba162c	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
segundo	0:ac1725ba162c	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
segundo	0:ac1725ba162c	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
segundo	0:ac1725ba162c	296
segundo	0:ac1725ba162c	297	#if LWIP_NETIF_HOSTNAME
segundo	0:ac1725ba162c	298	if (netif->hostname != NULL) {
segundo	0:ac1725ba162c	299	const char p = (const char)netif->hostname;
segundo	0:ac1725ba162c	300	u8_t namelen = (u8_t)strlen(p);
segundo	0:ac1725ba162c	301	if (namelen > 0) {
segundo	0:ac1725ba162c	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
segundo	0:ac1725ba162c	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
segundo	0:ac1725ba162c	304	while (*p) {
segundo	0:ac1725ba162c	305	dhcp_option_byte(dhcp, *p++);
segundo	0:ac1725ba162c	306	}
segundo	0:ac1725ba162c	307	}
segundo	0:ac1725ba162c	308	}
segundo	0:ac1725ba162c	309	#endif /* LWIP_NETIF_HOSTNAME */
segundo	0:ac1725ba162c	310
segundo	0:ac1725ba162c	311	dhcp_option_trailer(dhcp);
segundo	0:ac1725ba162c	312	/* shrink the pbuf to the actual content length */
segundo	0:ac1725ba162c	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo	0:ac1725ba162c	314
segundo	0:ac1725ba162c	315	/* send broadcast to any DHCP server */
segundo	0:ac1725ba162c	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	317	dhcp_delete_msg(dhcp);
segundo	0:ac1725ba162c	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
segundo	0:ac1725ba162c	319	} else {
segundo	0:ac1725ba162c	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	321	}
segundo	0:ac1725ba162c	322	dhcp->tries++;
segundo	0:ac1725ba162c	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
segundo	0:ac1725ba162c	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	326	return result;
segundo	0:ac1725ba162c	327	}
segundo	0:ac1725ba162c	328
segundo	0:ac1725ba162c	329	/**
segundo	0:ac1725ba162c	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
segundo	0:ac1725ba162c	331	*/
segundo	0:ac1725ba162c	332	void
segundo	0:ac1725ba162c	333	dhcp_coarse_tmr()
segundo	0:ac1725ba162c	334	{
segundo	0:ac1725ba162c	335	struct netif *netif = netif_list;
segundo	0:ac1725ba162c	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
segundo	0:ac1725ba162c	337	/* iterate through all network interfaces */
segundo	0:ac1725ba162c	338	while (netif != NULL) {
segundo	0:ac1725ba162c	339	/* only act on DHCP configured interfaces */
segundo	0:ac1725ba162c	340	if (netif->dhcp != NULL) {
segundo	0:ac1725ba162c	341	/* timer is active (non zero), and triggers (zeroes) now? */
segundo	0:ac1725ba162c	342	if (netif->dhcp->t2_timeout-- == 1) {
segundo	0:ac1725ba162c	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
segundo	0:ac1725ba162c	344	/* this clients' rebind timeout triggered */
segundo	0:ac1725ba162c	345	dhcp_t2_timeout(netif);
segundo	0:ac1725ba162c	346	/* timer is active (non zero), and triggers (zeroes) now */
segundo	0:ac1725ba162c	347	} else if (netif->dhcp->t1_timeout-- == 1) {
segundo	0:ac1725ba162c	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
segundo	0:ac1725ba162c	349	/* this clients' renewal timeout triggered */
segundo	0:ac1725ba162c	350	dhcp_t1_timeout(netif);
segundo	0:ac1725ba162c	351	}
segundo	0:ac1725ba162c	352	}
segundo	0:ac1725ba162c	353	/* proceed to next netif */
segundo	0:ac1725ba162c	354	netif = netif->next;
segundo	0:ac1725ba162c	355	}
segundo	0:ac1725ba162c	356	}
segundo	0:ac1725ba162c	357
segundo	0:ac1725ba162c	358	/**
segundo	0:ac1725ba162c	359	* DHCP transaction timeout handling
segundo	0:ac1725ba162c	360	*
segundo	0:ac1725ba162c	361	* A DHCP server is expected to respond within a short period of time.
segundo	0:ac1725ba162c	362	* This timer checks whether an outstanding DHCP request is timed out.
segundo	0:ac1725ba162c	363	*/
segundo	0:ac1725ba162c	364	void
segundo	0:ac1725ba162c	365	dhcp_fine_tmr()
segundo	0:ac1725ba162c	366	{
segundo	0:ac1725ba162c	367	struct netif *netif = netif_list;
segundo	0:ac1725ba162c	368	/* loop through netif's */
segundo	0:ac1725ba162c	369	while (netif != NULL) {
segundo	0:ac1725ba162c	370	/* only act on DHCP configured interfaces */
segundo	0:ac1725ba162c	371	if (netif->dhcp != NULL) {
segundo	0:ac1725ba162c	372	/* timer is active (non zero), and is about to trigger now */
segundo	0:ac1725ba162c	373	if (netif->dhcp->request_timeout > 1) {
segundo	0:ac1725ba162c	374	netif->dhcp->request_timeout--;
segundo	0:ac1725ba162c	375	}
segundo	0:ac1725ba162c	376	else if (netif->dhcp->request_timeout == 1) {
segundo	0:ac1725ba162c	377	netif->dhcp->request_timeout--;
segundo	0:ac1725ba162c	378	/* { netif->dhcp->request_timeout == 0 } */
segundo	0:ac1725ba162c	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
segundo	0:ac1725ba162c	380	/* this client's request timeout triggered */
segundo	0:ac1725ba162c	381	dhcp_timeout(netif);
segundo	0:ac1725ba162c	382	}
segundo	0:ac1725ba162c	383	}
segundo	0:ac1725ba162c	384	/* proceed to next network interface */
segundo	0:ac1725ba162c	385	netif = netif->next;
segundo	0:ac1725ba162c	386	}
segundo	0:ac1725ba162c	387	}
segundo	0:ac1725ba162c	388
segundo	0:ac1725ba162c	389	/**
segundo	0:ac1725ba162c	390	* A DHCP negotiation transaction, or ARP request, has timed out.
segundo	0:ac1725ba162c	391	*
segundo	0:ac1725ba162c	392	* The timer that was started with the DHCP or ARP request has
segundo	0:ac1725ba162c	393	* timed out, indicating no response was received in time.
segundo	0:ac1725ba162c	394	*
segundo	0:ac1725ba162c	395	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	396	*/
segundo	0:ac1725ba162c	397	static void
segundo	0:ac1725ba162c	398	dhcp_timeout(struct netif *netif)
segundo	0:ac1725ba162c	399	{
segundo	0:ac1725ba162c	400	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
segundo	0:ac1725ba162c	402	/* back-off period has passed, or server selection timed out */
segundo	0:ac1725ba162c	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
segundo	0:ac1725ba162c	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
segundo	0:ac1725ba162c	405	dhcp_discover(netif);
segundo	0:ac1725ba162c	406	/* receiving the requested lease timed out */
segundo	0:ac1725ba162c	407	} else if (dhcp->state == DHCP_REQUESTING) {
segundo	0:ac1725ba162c	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
segundo	0:ac1725ba162c	409	if (dhcp->tries <= 5) {
segundo	0:ac1725ba162c	410	dhcp_select(netif);
segundo	0:ac1725ba162c	411	} else {
segundo	0:ac1725ba162c	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
segundo	0:ac1725ba162c	413	dhcp_release(netif);
segundo	0:ac1725ba162c	414	dhcp_discover(netif);
segundo	0:ac1725ba162c	415	}
segundo	0:ac1725ba162c	416	#if DHCP_DOES_ARP_CHECK
segundo	0:ac1725ba162c	417	/* received no ARP reply for the offered address (which is good) */
segundo	0:ac1725ba162c	418	} else if (dhcp->state == DHCP_CHECKING) {
segundo	0:ac1725ba162c	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
segundo	0:ac1725ba162c	420	if (dhcp->tries <= 1) {
segundo	0:ac1725ba162c	421	dhcp_check(netif);
segundo	0:ac1725ba162c	422	/* no ARP replies on the offered address,
segundo	0:ac1725ba162c	423	looks like the IP address is indeed free */
segundo	0:ac1725ba162c	424	} else {
segundo	0:ac1725ba162c	425	/* bind the interface to the offered address */
segundo	0:ac1725ba162c	426	dhcp_bind(netif);
segundo	0:ac1725ba162c	427	}
segundo	0:ac1725ba162c	428	#endif /* DHCP_DOES_ARP_CHECK */
segundo	0:ac1725ba162c	429	}
segundo	0:ac1725ba162c	430	/* did not get response to renew request? */
segundo	0:ac1725ba162c	431	else if (dhcp->state == DHCP_RENEWING) {
segundo	0:ac1725ba162c	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
segundo	0:ac1725ba162c	433	/* just retry renewal */
segundo	0:ac1725ba162c	434	/* note that the rebind timer will eventually time-out if renew does not work */
segundo	0:ac1725ba162c	435	dhcp_renew(netif);
segundo	0:ac1725ba162c	436	/* did not get response to rebind request? */
segundo	0:ac1725ba162c	437	} else if (dhcp->state == DHCP_REBINDING) {
segundo	0:ac1725ba162c	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
segundo	0:ac1725ba162c	439	if (dhcp->tries <= 8) {
segundo	0:ac1725ba162c	440	dhcp_rebind(netif);
segundo	0:ac1725ba162c	441	} else {
segundo	0:ac1725ba162c	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
segundo	0:ac1725ba162c	443	dhcp_release(netif);
segundo	0:ac1725ba162c	444	dhcp_discover(netif);
segundo	0:ac1725ba162c	445	}
segundo	0:ac1725ba162c	446	} else if (dhcp->state == DHCP_REBOOTING) {
segundo	0:ac1725ba162c	447	if (dhcp->tries < REBOOT_TRIES) {
segundo	0:ac1725ba162c	448	dhcp_reboot(netif);
segundo	0:ac1725ba162c	449	} else {
segundo	0:ac1725ba162c	450	dhcp_discover(netif);
segundo	0:ac1725ba162c	451	}
segundo	0:ac1725ba162c	452	}
segundo	0:ac1725ba162c	453	}
segundo	0:ac1725ba162c	454
segundo	0:ac1725ba162c	455	/**
segundo	0:ac1725ba162c	456	* The renewal period has timed out.
segundo	0:ac1725ba162c	457	*
segundo	0:ac1725ba162c	458	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	459	*/
segundo	0:ac1725ba162c	460	static void
segundo	0:ac1725ba162c	461	dhcp_t1_timeout(struct netif *netif)
segundo	0:ac1725ba162c	462	{
segundo	0:ac1725ba162c	463	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
segundo	0:ac1725ba162c	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
segundo	0:ac1725ba162c	466	(dhcp->state == DHCP_RENEWING)) {
segundo	0:ac1725ba162c	467	/* just retry to renew - note that the rebind timer (t2) will
segundo	0:ac1725ba162c	468	* eventually time-out if renew tries fail. */
segundo	0:ac1725ba162c	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
segundo	0:ac1725ba162c	470	("dhcp_t1_timeout(): must renew\n"));
segundo	0:ac1725ba162c	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
segundo	0:ac1725ba162c	472	DHCP_RENEWING, not DHCP_BOUND */
segundo	0:ac1725ba162c	473	dhcp_renew(netif);
segundo	0:ac1725ba162c	474	}
segundo	0:ac1725ba162c	475	}
segundo	0:ac1725ba162c	476
segundo	0:ac1725ba162c	477	/**
segundo	0:ac1725ba162c	478	* The rebind period has timed out.
segundo	0:ac1725ba162c	479	*
segundo	0:ac1725ba162c	480	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	481	*/
segundo	0:ac1725ba162c	482	static void
segundo	0:ac1725ba162c	483	dhcp_t2_timeout(struct netif *netif)
segundo	0:ac1725ba162c	484	{
segundo	0:ac1725ba162c	485	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
segundo	0:ac1725ba162c	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
segundo	0:ac1725ba162c	488	(dhcp->state == DHCP_RENEWING)) {
segundo	0:ac1725ba162c	489	/* just retry to rebind */
segundo	0:ac1725ba162c	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
segundo	0:ac1725ba162c	491	("dhcp_t2_timeout(): must rebind\n"));
segundo	0:ac1725ba162c	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
segundo	0:ac1725ba162c	493	DHCP_REBINDING, not DHCP_BOUND */
segundo	0:ac1725ba162c	494	dhcp_rebind(netif);
segundo	0:ac1725ba162c	495	}
segundo	0:ac1725ba162c	496	}
segundo	0:ac1725ba162c	497
segundo	0:ac1725ba162c	498	/**
segundo	0:ac1725ba162c	499	* Handle a DHCP ACK packet
segundo	0:ac1725ba162c	500	*
segundo	0:ac1725ba162c	501	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	502	*/
segundo	0:ac1725ba162c	503	static void
segundo	0:ac1725ba162c	504	dhcp_handle_ack(struct netif *netif)
segundo	0:ac1725ba162c	505	{
segundo	0:ac1725ba162c	506	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	507	#if LWIP_DNS
segundo	0:ac1725ba162c	508	u8_t n;
segundo	0:ac1725ba162c	509	#endif /* LWIP_DNS */
segundo	0:ac1725ba162c	510
segundo	0:ac1725ba162c	511	/* clear options we might not get from the ACK */
segundo	0:ac1725ba162c	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
segundo	0:ac1725ba162c	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
segundo	0:ac1725ba162c	514	#if LWIP_DHCP_BOOTP_FILE
segundo	0:ac1725ba162c	515	ip_addr_set_zero(&dhcp->offered_si_addr);
segundo	0:ac1725ba162c	516	#endif /* LWIP_DHCP_BOOTP_FILE */
segundo	0:ac1725ba162c	517
segundo	0:ac1725ba162c	518	/* lease time given? */
segundo	0:ac1725ba162c	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
segundo	0:ac1725ba162c	520	/* remember offered lease time */
segundo	0:ac1725ba162c	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
segundo	0:ac1725ba162c	522	}
segundo	0:ac1725ba162c	523	/* renewal period given? */
segundo	0:ac1725ba162c	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
segundo	0:ac1725ba162c	525	/* remember given renewal period */
segundo	0:ac1725ba162c	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
segundo	0:ac1725ba162c	527	} else {
segundo	0:ac1725ba162c	528	/* calculate safe periods for renewal */
segundo	0:ac1725ba162c	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
segundo	0:ac1725ba162c	530	}
segundo	0:ac1725ba162c	531
segundo	0:ac1725ba162c	532	/* renewal period given? */
segundo	0:ac1725ba162c	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
segundo	0:ac1725ba162c	534	/* remember given rebind period */
segundo	0:ac1725ba162c	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
segundo	0:ac1725ba162c	536	} else {
segundo	0:ac1725ba162c	537	/* calculate safe periods for rebinding */
segundo	0:ac1725ba162c	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
segundo	0:ac1725ba162c	539	}
segundo	0:ac1725ba162c	540
segundo	0:ac1725ba162c	541	/* (y)our internet address */
segundo	0:ac1725ba162c	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
segundo	0:ac1725ba162c	543
segundo	0:ac1725ba162c	544	#if LWIP_DHCP_BOOTP_FILE
segundo	0:ac1725ba162c	545	/* copy boot server address,
segundo	0:ac1725ba162c	546	boot file name copied in dhcp_parse_reply if not overloaded */
segundo	0:ac1725ba162c	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
segundo	0:ac1725ba162c	548	#endif /* LWIP_DHCP_BOOTP_FILE */
segundo	0:ac1725ba162c	549
segundo	0:ac1725ba162c	550	/* subnet mask given? */
segundo	0:ac1725ba162c	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
segundo	0:ac1725ba162c	552	/* remember given subnet mask */
segundo	0:ac1725ba162c	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
segundo	0:ac1725ba162c	554	dhcp->subnet_mask_given = 1;
segundo	0:ac1725ba162c	555	} else {
segundo	0:ac1725ba162c	556	dhcp->subnet_mask_given = 0;
segundo	0:ac1725ba162c	557	}
segundo	0:ac1725ba162c	558
segundo	0:ac1725ba162c	559	/* gateway router */
segundo	0:ac1725ba162c	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
segundo	0:ac1725ba162c	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
segundo	0:ac1725ba162c	562	}
segundo	0:ac1725ba162c	563
segundo	0:ac1725ba162c	564	#if LWIP_DNS
segundo	0:ac1725ba162c	565	/* DNS servers */
segundo	0:ac1725ba162c	566	n = 0;
segundo	0:ac1725ba162c	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
segundo	0:ac1725ba162c	568	ip_addr_t dns_addr;
segundo	0:ac1725ba162c	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
segundo	0:ac1725ba162c	570	dns_setserver(n, &dns_addr);
segundo	0:ac1725ba162c	571	n++;
segundo	0:ac1725ba162c	572	}
segundo	0:ac1725ba162c	573	#endif /* LWIP_DNS */
segundo	0:ac1725ba162c	574	}
segundo	0:ac1725ba162c	575
segundo	0:ac1725ba162c	576	/** Set a statically allocated struct dhcp to work with.
segundo	0:ac1725ba162c	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
segundo	0:ac1725ba162c	578	*
segundo	0:ac1725ba162c	579	* @param netif the netif for which to set the struct dhcp
segundo	0:ac1725ba162c	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
segundo	0:ac1725ba162c	581	*/
segundo	0:ac1725ba162c	582	void
segundo	0:ac1725ba162c	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
segundo	0:ac1725ba162c	584	{
segundo	0:ac1725ba162c	585	LWIP_ASSERT("netif != NULL", netif != NULL);
segundo	0:ac1725ba162c	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
segundo	0:ac1725ba162c	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
segundo	0:ac1725ba162c	588
segundo	0:ac1725ba162c	589	/* clear data structure */
segundo	0:ac1725ba162c	590	memset(dhcp, 0, sizeof(struct dhcp));
segundo	0:ac1725ba162c	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
segundo	0:ac1725ba162c	592	netif->dhcp = dhcp;
segundo	0:ac1725ba162c	593	}
segundo	0:ac1725ba162c	594
segundo	0:ac1725ba162c	595	/**
segundo	0:ac1725ba162c	596	* Start DHCP negotiation for a network interface.
segundo	0:ac1725ba162c	597	*
segundo	0:ac1725ba162c	598	* If no DHCP client instance was attached to this interface,
segundo	0:ac1725ba162c	599	* a new client is created first. If a DHCP client instance
segundo	0:ac1725ba162c	600	* was already present, it restarts negotiation.
segundo	0:ac1725ba162c	601	*
segundo	0:ac1725ba162c	602	* @param netif The lwIP network interface
segundo	0:ac1725ba162c	603	* @return lwIP error code
segundo	0:ac1725ba162c	604	* - ERR_OK - No error
segundo	0:ac1725ba162c	605	* - ERR_MEM - Out of memory
segundo	0:ac1725ba162c	606	*/
segundo	0:ac1725ba162c	607	err_t
segundo	0:ac1725ba162c	608	dhcp_start(struct netif *netif)
segundo	0:ac1725ba162c	609	{
segundo	0:ac1725ba162c	610	struct dhcp *dhcp;
segundo	0:ac1725ba162c	611	err_t result = ERR_OK;
segundo	0:ac1725ba162c	612
segundo	0:ac1725ba162c	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
segundo	0:ac1725ba162c	614	dhcp = netif->dhcp;
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	616	/* Remove the flag that says this netif is handled by DHCP,
segundo	0:ac1725ba162c	617	it is set when we succeeded starting. */
segundo	0:ac1725ba162c	618	netif->flags &= ~NETIF_FLAG_DHCP;
segundo	0:ac1725ba162c	619
segundo	0:ac1725ba162c	620	/* check hwtype of the netif */
segundo	0:ac1725ba162c	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
segundo	0:ac1725ba162c	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
segundo	0:ac1725ba162c	623	return ERR_ARG;
segundo	0:ac1725ba162c	624	}
segundo	0:ac1725ba162c	625
segundo	0:ac1725ba162c	626	/* check MTU of the netif */
segundo	0:ac1725ba162c	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
segundo	0:ac1725ba162c	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
segundo	0:ac1725ba162c	629	return ERR_MEM;
segundo	0:ac1725ba162c	630	}
segundo	0:ac1725ba162c	631
segundo	0:ac1725ba162c	632	/* no DHCP client attached yet? */
segundo	0:ac1725ba162c	633	if (dhcp == NULL) {
segundo	0:ac1725ba162c	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
segundo	0:ac1725ba162c	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
segundo	0:ac1725ba162c	636	if (dhcp == NULL) {
segundo	0:ac1725ba162c	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
segundo	0:ac1725ba162c	638	return ERR_MEM;
segundo	0:ac1725ba162c	639	}
segundo	0:ac1725ba162c	640	/* store this dhcp client in the netif */
segundo	0:ac1725ba162c	641	netif->dhcp = dhcp;
segundo	0:ac1725ba162c	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
segundo	0:ac1725ba162c	643	/* already has DHCP client attached */
segundo	0:ac1725ba162c	644	} else {
segundo	0:ac1725ba162c	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
segundo	0:ac1725ba162c	646	if (dhcp->pcb != NULL) {
segundo	0:ac1725ba162c	647	udp_remove(dhcp->pcb);
segundo	0:ac1725ba162c	648	}
segundo	0:ac1725ba162c	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
segundo	0:ac1725ba162c	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
segundo	0:ac1725ba162c	651	}
segundo	0:ac1725ba162c	652
segundo	0:ac1725ba162c	653	/* clear data structure */
segundo	0:ac1725ba162c	654	memset(dhcp, 0, sizeof(struct dhcp));
segundo	0:ac1725ba162c	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
segundo	0:ac1725ba162c	656	/* allocate UDP PCB */
segundo	0:ac1725ba162c	657	dhcp->pcb = udp_new();
segundo	0:ac1725ba162c	658	if (dhcp->pcb == NULL) {
segundo	0:ac1725ba162c	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
segundo	0:ac1725ba162c	660	return ERR_MEM;
segundo	0:ac1725ba162c	661	}
segundo	0:ac1725ba162c	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
segundo	0:ac1725ba162c	663	/* set up local and remote port for the pcb */
segundo	0:ac1725ba162c	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
segundo	0:ac1725ba162c	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
segundo	0:ac1725ba162c	666	/* set up the recv callback and argument */
segundo	0:ac1725ba162c	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
segundo	0:ac1725ba162c	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
segundo	0:ac1725ba162c	669	/* (re)start the DHCP negotiation */
segundo	0:ac1725ba162c	670	result = dhcp_discover(netif);
segundo	0:ac1725ba162c	671	if (result != ERR_OK) {
segundo	0:ac1725ba162c	672	/* free resources allocated above */
segundo	0:ac1725ba162c	673	dhcp_stop(netif);
segundo	0:ac1725ba162c	674	return ERR_MEM;
segundo	0:ac1725ba162c	675	}
segundo	0:ac1725ba162c	676	/* Set the flag that says this netif is handled by DHCP. */
segundo	0:ac1725ba162c	677	netif->flags \|= NETIF_FLAG_DHCP;
segundo	0:ac1725ba162c	678	return result;
segundo	0:ac1725ba162c	679	}
segundo	0:ac1725ba162c	680
segundo	0:ac1725ba162c	681	/**
segundo	0:ac1725ba162c	682	* Inform a DHCP server of our manual configuration.
segundo	0:ac1725ba162c	683	*
segundo	0:ac1725ba162c	684	* This informs DHCP servers of our fixed IP address configuration
segundo	0:ac1725ba162c	685	* by sending an INFORM message. It does not involve DHCP address
segundo	0:ac1725ba162c	686	* configuration, it is just here to be nice to the network.
segundo	0:ac1725ba162c	687	*
segundo	0:ac1725ba162c	688	* @param netif The lwIP network interface
segundo	0:ac1725ba162c	689	*/
segundo	0:ac1725ba162c	690	void
segundo	0:ac1725ba162c	691	dhcp_inform(struct netif *netif)
segundo	0:ac1725ba162c	692	{
segundo	0:ac1725ba162c	693	struct dhcp dhcp;
segundo	0:ac1725ba162c	694	err_t result = ERR_OK;
segundo	0:ac1725ba162c	695	struct udp_pcb *pcb;
segundo	0:ac1725ba162c	696
segundo	0:ac1725ba162c	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
segundo	0:ac1725ba162c	698
segundo	0:ac1725ba162c	699	memset(&dhcp, 0, sizeof(struct dhcp));
segundo	0:ac1725ba162c	700	dhcp_set_state(&dhcp, DHCP_INFORM);
segundo	0:ac1725ba162c	701
segundo	0:ac1725ba162c	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
segundo	0:ac1725ba162c	703	/* re-use existing pcb */
segundo	0:ac1725ba162c	704	pcb = netif->dhcp->pcb;
segundo	0:ac1725ba162c	705	} else {
segundo	0:ac1725ba162c	706	pcb = udp_new();
segundo	0:ac1725ba162c	707	if (pcb == NULL) {
segundo	0:ac1725ba162c	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
segundo	0:ac1725ba162c	709	return;
segundo	0:ac1725ba162c	710	}
segundo	0:ac1725ba162c	711	dhcp.pcb = pcb;
segundo	0:ac1725ba162c	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
segundo	0:ac1725ba162c	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
segundo	0:ac1725ba162c	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
segundo	0:ac1725ba162c	715	}
segundo	0:ac1725ba162c	716	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
segundo	0:ac1725ba162c	718	if (result == ERR_OK) {
segundo	0:ac1725ba162c	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo	0:ac1725ba162c	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
segundo	0:ac1725ba162c	721
segundo	0:ac1725ba162c	722	dhcp_option_trailer(&dhcp);
segundo	0:ac1725ba162c	723
segundo	0:ac1725ba162c	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
segundo	0:ac1725ba162c	725
segundo	0:ac1725ba162c	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
segundo	0:ac1725ba162c	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	728	dhcp_delete_msg(&dhcp);
segundo	0:ac1725ba162c	729	} else {
segundo	0:ac1725ba162c	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	731	}
segundo	0:ac1725ba162c	732
segundo	0:ac1725ba162c	733	if (dhcp.pcb != NULL) {
segundo	0:ac1725ba162c	734	/* otherwise, the existing pcb was used */
segundo	0:ac1725ba162c	735	udp_remove(dhcp.pcb);
segundo	0:ac1725ba162c	736	}
segundo	0:ac1725ba162c	737	}
segundo	0:ac1725ba162c	738
segundo	0:ac1725ba162c	739	/** Handle a possible change in the network configuration.
segundo	0:ac1725ba162c	740	*
segundo	0:ac1725ba162c	741	* This enters the REBOOTING state to verify that the currently bound
segundo	0:ac1725ba162c	742	* address is still valid.
segundo	0:ac1725ba162c	743	*/
segundo	0:ac1725ba162c	744	void
segundo	0:ac1725ba162c	745	dhcp_network_changed(struct netif *netif)
segundo	0:ac1725ba162c	746	{
segundo	0:ac1725ba162c	747	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	748	if (!dhcp)
segundo	0:ac1725ba162c	749	return;
segundo	0:ac1725ba162c	750	switch (dhcp->state) {
segundo	0:ac1725ba162c	751	case DHCP_REBINDING:
segundo	0:ac1725ba162c	752	case DHCP_RENEWING:
segundo	0:ac1725ba162c	753	case DHCP_BOUND:
segundo	0:ac1725ba162c	754	case DHCP_REBOOTING:
segundo	0:ac1725ba162c	755	netif_set_down(netif);
segundo	0:ac1725ba162c	756	dhcp->tries = 0;
segundo	0:ac1725ba162c	757	dhcp_reboot(netif);
segundo	0:ac1725ba162c	758	break;
segundo	0:ac1725ba162c	759	case DHCP_OFF:
segundo	0:ac1725ba162c	760	/* stay off */
segundo	0:ac1725ba162c	761	break;
segundo	0:ac1725ba162c	762	default:
segundo	0:ac1725ba162c	763	dhcp->tries = 0;
segundo	0:ac1725ba162c	764	#if LWIP_DHCP_AUTOIP_COOP
segundo	0:ac1725ba162c	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
segundo	0:ac1725ba162c	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
segundo	0:ac1725ba162c	767	dhcp_discover(netif);
segundo	0:ac1725ba162c	768	break;
segundo	0:ac1725ba162c	769	}
segundo	0:ac1725ba162c	770	}
segundo	0:ac1725ba162c	771
segundo	0:ac1725ba162c	772	#if DHCP_DOES_ARP_CHECK
segundo	0:ac1725ba162c	773	/**
segundo	0:ac1725ba162c	774	* Match an ARP reply with the offered IP address.
segundo	0:ac1725ba162c	775	*
segundo	0:ac1725ba162c	776	* @param netif the network interface on which the reply was received
segundo	0:ac1725ba162c	777	* @param addr The IP address we received a reply from
segundo	0:ac1725ba162c	778	*/
segundo	0:ac1725ba162c	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
segundo	0:ac1725ba162c	780	{
segundo	0:ac1725ba162c	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
segundo	0:ac1725ba162c	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
segundo	0:ac1725ba162c	783	/* is a DHCP client doing an ARP check? */
segundo	0:ac1725ba162c	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
segundo	0:ac1725ba162c	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
segundo	0:ac1725ba162c	786	ip4_addr_get_u32(addr)));
segundo	0:ac1725ba162c	787	/* did a host respond with the address we
segundo	0:ac1725ba162c	788	were offered by the DHCP server? */
segundo	0:ac1725ba162c	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
segundo	0:ac1725ba162c	790	/* we will not accept the offered address */
segundo	0:ac1725ba162c	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
segundo	0:ac1725ba162c	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
segundo	0:ac1725ba162c	793	dhcp_decline(netif);
segundo	0:ac1725ba162c	794	}
segundo	0:ac1725ba162c	795	}
segundo	0:ac1725ba162c	796	}
segundo	0:ac1725ba162c	797
segundo	0:ac1725ba162c	798	/**
segundo	0:ac1725ba162c	799	* Decline an offered lease.
segundo	0:ac1725ba162c	800	*
segundo	0:ac1725ba162c	801	* Tell the DHCP server we do not accept the offered address.
segundo	0:ac1725ba162c	802	* One reason to decline the lease is when we find out the address
segundo	0:ac1725ba162c	803	* is already in use by another host (through ARP).
segundo	0:ac1725ba162c	804	*
segundo	0:ac1725ba162c	805	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	806	*/
segundo	0:ac1725ba162c	807	static err_t
segundo	0:ac1725ba162c	808	dhcp_decline(struct netif *netif)
segundo	0:ac1725ba162c	809	{
segundo	0:ac1725ba162c	810	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	811	err_t result = ERR_OK;
segundo	0:ac1725ba162c	812	u16_t msecs;
segundo	0:ac1725ba162c	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
segundo	0:ac1725ba162c	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
segundo	0:ac1725ba162c	815	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
segundo	0:ac1725ba162c	817	if (result == ERR_OK) {
segundo	0:ac1725ba162c	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo	0:ac1725ba162c	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo	0:ac1725ba162c	820
segundo	0:ac1725ba162c	821	dhcp_option_trailer(dhcp);
segundo	0:ac1725ba162c	822	/* resize pbuf to reflect true size of options */
segundo	0:ac1725ba162c	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo	0:ac1725ba162c	824
segundo	0:ac1725ba162c	825	/* per section 4.4.4, broadcast DECLINE messages */
segundo	0:ac1725ba162c	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	827	dhcp_delete_msg(dhcp);
segundo	0:ac1725ba162c	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
segundo	0:ac1725ba162c	829	} else {
segundo	0:ac1725ba162c	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
segundo	0:ac1725ba162c	831	("dhcp_decline: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	832	}
segundo	0:ac1725ba162c	833	dhcp->tries++;
segundo	0:ac1725ba162c	834	msecs = 10*1000;
segundo	0:ac1725ba162c	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	837	return result;
segundo	0:ac1725ba162c	838	}
segundo	0:ac1725ba162c	839	#endif /* DHCP_DOES_ARP_CHECK */
segundo	0:ac1725ba162c	840
segundo	0:ac1725ba162c	841
segundo	0:ac1725ba162c	842	/**
segundo	0:ac1725ba162c	843	* Start the DHCP process, discover a DHCP server.
segundo	0:ac1725ba162c	844	*
segundo	0:ac1725ba162c	845	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	846	*/
segundo	0:ac1725ba162c	847	static err_t
segundo	0:ac1725ba162c	848	dhcp_discover(struct netif *netif)
segundo	0:ac1725ba162c	849	{
segundo	0:ac1725ba162c	850	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	851	err_t result = ERR_OK;
segundo	0:ac1725ba162c	852	u16_t msecs;
segundo	0:ac1725ba162c	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
segundo	0:ac1725ba162c	854	ip_addr_set_any(&dhcp->offered_ip_addr);
segundo	0:ac1725ba162c	855	dhcp_set_state(dhcp, DHCP_SELECTING);
segundo	0:ac1725ba162c	856	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
segundo	0:ac1725ba162c	858	if (result == ERR_OK) {
segundo	0:ac1725ba162c	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
segundo	0:ac1725ba162c	860
segundo	0:ac1725ba162c	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo	0:ac1725ba162c	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo	0:ac1725ba162c	863
segundo	0:ac1725ba162c	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
segundo	0:ac1725ba162c	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
segundo	0:ac1725ba162c	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
segundo	0:ac1725ba162c	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
segundo	0:ac1725ba162c	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
segundo	0:ac1725ba162c	869
segundo	0:ac1725ba162c	870	dhcp_option_trailer(dhcp);
segundo	0:ac1725ba162c	871
segundo	0:ac1725ba162c	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
segundo	0:ac1725ba162c	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo	0:ac1725ba162c	874
segundo	0:ac1725ba162c	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
segundo	0:ac1725ba162c	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
segundo	0:ac1725ba162c	878	dhcp_delete_msg(dhcp);
segundo	0:ac1725ba162c	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
segundo	0:ac1725ba162c	880	} else {
segundo	0:ac1725ba162c	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	882	}
segundo	0:ac1725ba162c	883	dhcp->tries++;
segundo	0:ac1725ba162c	884	#if LWIP_DHCP_AUTOIP_COOP
segundo	0:ac1725ba162c	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
segundo	0:ac1725ba162c	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
segundo	0:ac1725ba162c	887	autoip_start(netif);
segundo	0:ac1725ba162c	888	}
segundo	0:ac1725ba162c	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
segundo	0:ac1725ba162c	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
segundo	0:ac1725ba162c	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	893	return result;
segundo	0:ac1725ba162c	894	}
segundo	0:ac1725ba162c	895
segundo	0:ac1725ba162c	896
segundo	0:ac1725ba162c	897	/**
segundo	0:ac1725ba162c	898	* Bind the interface to the offered IP address.
segundo	0:ac1725ba162c	899	*
segundo	0:ac1725ba162c	900	* @param netif network interface to bind to the offered address
segundo	0:ac1725ba162c	901	*/
segundo	0:ac1725ba162c	902	static void
segundo	0:ac1725ba162c	903	dhcp_bind(struct netif *netif)
segundo	0:ac1725ba162c	904	{
segundo	0:ac1725ba162c	905	u32_t timeout;
segundo	0:ac1725ba162c	906	struct dhcp *dhcp;
segundo	0:ac1725ba162c	907	ip_addr_t sn_mask, gw_addr;
segundo	0:ac1725ba162c	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
segundo	0:ac1725ba162c	909	dhcp = netif->dhcp;
segundo	0:ac1725ba162c	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	912
segundo	0:ac1725ba162c	913	/* temporary DHCP lease? */
segundo	0:ac1725ba162c	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
segundo	0:ac1725ba162c	915	/* set renewal period timer */
segundo	0:ac1725ba162c	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
segundo	0:ac1725ba162c	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
segundo	0:ac1725ba162c	918	if(timeout > 0xffff) {
segundo	0:ac1725ba162c	919	timeout = 0xffff;
segundo	0:ac1725ba162c	920	}
segundo	0:ac1725ba162c	921	dhcp->t1_timeout = (u16_t)timeout;
segundo	0:ac1725ba162c	922	if (dhcp->t1_timeout == 0) {
segundo	0:ac1725ba162c	923	dhcp->t1_timeout = 1;
segundo	0:ac1725ba162c	924	}
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	926	}
segundo	0:ac1725ba162c	927	/* set renewal period timer */
segundo	0:ac1725ba162c	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
segundo	0:ac1725ba162c	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
segundo	0:ac1725ba162c	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
segundo	0:ac1725ba162c	931	if(timeout > 0xffff) {
segundo	0:ac1725ba162c	932	timeout = 0xffff;
segundo	0:ac1725ba162c	933	}
segundo	0:ac1725ba162c	934	dhcp->t2_timeout = (u16_t)timeout;
segundo	0:ac1725ba162c	935	if (dhcp->t2_timeout == 0) {
segundo	0:ac1725ba162c	936	dhcp->t2_timeout = 1;
segundo	0:ac1725ba162c	937	}
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	939	}
segundo	0:ac1725ba162c	940
segundo	0:ac1725ba162c	941	if (dhcp->subnet_mask_given) {
segundo	0:ac1725ba162c	942	/* copy offered network mask */
segundo	0:ac1725ba162c	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
segundo	0:ac1725ba162c	944	} else {
segundo	0:ac1725ba162c	945	/* subnet mask not given, choose a safe subnet mask given the network class */
segundo	0:ac1725ba162c	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
segundo	0:ac1725ba162c	947	if (first_octet <= 127) {
segundo	0:ac1725ba162c	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
segundo	0:ac1725ba162c	949	} else if (first_octet >= 192) {
segundo	0:ac1725ba162c	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
segundo	0:ac1725ba162c	951	} else {
segundo	0:ac1725ba162c	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
segundo	0:ac1725ba162c	953	}
segundo	0:ac1725ba162c	954	}
segundo	0:ac1725ba162c	955
segundo	0:ac1725ba162c	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
segundo	0:ac1725ba162c	957	/* gateway address not given? */
segundo	0:ac1725ba162c	958	if (ip_addr_isany(&gw_addr)) {
segundo	0:ac1725ba162c	959	/* copy network address */
segundo	0:ac1725ba162c	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
segundo	0:ac1725ba162c	961	/* use first host address on network as gateway */
segundo	0:ac1725ba162c	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
segundo	0:ac1725ba162c	963	}
segundo	0:ac1725ba162c	964
segundo	0:ac1725ba162c	965	#if LWIP_DHCP_AUTOIP_COOP
segundo	0:ac1725ba162c	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
segundo	0:ac1725ba162c	967	autoip_stop(netif);
segundo	0:ac1725ba162c	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
segundo	0:ac1725ba162c	969	}
segundo	0:ac1725ba162c	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
segundo	0:ac1725ba162c	971
segundo	0:ac1725ba162c	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
segundo	0:ac1725ba162c	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo	0:ac1725ba162c	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
segundo	0:ac1725ba162c	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
segundo	0:ac1725ba162c	976	ip4_addr_get_u32(&sn_mask)));
segundo	0:ac1725ba162c	977	netif_set_netmask(netif, &sn_mask);
segundo	0:ac1725ba162c	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
segundo	0:ac1725ba162c	979	ip4_addr_get_u32(&gw_addr)));
segundo	0:ac1725ba162c	980	netif_set_gw(netif, &gw_addr);
segundo	0:ac1725ba162c	981	/* bring the interface up */
segundo	0:ac1725ba162c	982	netif_set_up(netif);
segundo	0:ac1725ba162c	983	/* netif is now bound to DHCP leased address */
segundo	0:ac1725ba162c	984	dhcp_set_state(dhcp, DHCP_BOUND);
segundo	0:ac1725ba162c	985	}
segundo	0:ac1725ba162c	986
segundo	0:ac1725ba162c	987	/**
segundo	0:ac1725ba162c	988	* Renew an existing DHCP lease at the involved DHCP server.
segundo	0:ac1725ba162c	989	*
segundo	0:ac1725ba162c	990	* @param netif network interface which must renew its lease
segundo	0:ac1725ba162c	991	*/
segundo	0:ac1725ba162c	992	err_t
segundo	0:ac1725ba162c	993	dhcp_renew(struct netif *netif)
segundo	0:ac1725ba162c	994	{
segundo	0:ac1725ba162c	995	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	996	err_t result;
segundo	0:ac1725ba162c	997	u16_t msecs;
segundo	0:ac1725ba162c	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
segundo	0:ac1725ba162c	999	dhcp_set_state(dhcp, DHCP_RENEWING);
segundo	0:ac1725ba162c	1000
segundo	0:ac1725ba162c	1001	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo	0:ac1725ba162c	1003	if (result == ERR_OK) {
segundo	0:ac1725ba162c	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo	0:ac1725ba162c	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo	0:ac1725ba162c	1006
segundo	0:ac1725ba162c	1007	#if LWIP_NETIF_HOSTNAME
segundo	0:ac1725ba162c	1008	if (netif->hostname != NULL) {
segundo	0:ac1725ba162c	1009	const char p = (const char)netif->hostname;
segundo	0:ac1725ba162c	1010	u8_t namelen = (u8_t)strlen(p);
segundo	0:ac1725ba162c	1011	if (namelen > 0) {
segundo	0:ac1725ba162c	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
segundo	0:ac1725ba162c	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
segundo	0:ac1725ba162c	1014	while (*p) {
segundo	0:ac1725ba162c	1015	dhcp_option_byte(dhcp, *p++);
segundo	0:ac1725ba162c	1016	}
segundo	0:ac1725ba162c	1017	}
segundo	0:ac1725ba162c	1018	}
segundo	0:ac1725ba162c	1019	#endif /* LWIP_NETIF_HOSTNAME */
segundo	0:ac1725ba162c	1020
segundo	0:ac1725ba162c	1021	#if 0
segundo	0:ac1725ba162c	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo	0:ac1725ba162c	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
segundo	0:ac1725ba162c	1024	#endif
segundo	0:ac1725ba162c	1025
segundo	0:ac1725ba162c	1026	#if 0
segundo	0:ac1725ba162c	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
segundo	0:ac1725ba162c	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
segundo	0:ac1725ba162c	1029	#endif
segundo	0:ac1725ba162c	1030	/* append DHCP message trailer */
segundo	0:ac1725ba162c	1031	dhcp_option_trailer(dhcp);
segundo	0:ac1725ba162c	1032
segundo	0:ac1725ba162c	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo	0:ac1725ba162c	1034
segundo	0:ac1725ba162c	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	1036	dhcp_delete_msg(dhcp);
segundo	0:ac1725ba162c	1037
segundo	0:ac1725ba162c	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
segundo	0:ac1725ba162c	1039	} else {
segundo	0:ac1725ba162c	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	1041	}
segundo	0:ac1725ba162c	1042	dhcp->tries++;
segundo	0:ac1725ba162c	1043	/* back-off on retries, but to a maximum of 20 seconds */
segundo	0:ac1725ba162c	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
segundo	0:ac1725ba162c	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	1047	return result;
segundo	0:ac1725ba162c	1048	}
segundo	0:ac1725ba162c	1049
segundo	0:ac1725ba162c	1050	/**
segundo	0:ac1725ba162c	1051	* Rebind with a DHCP server for an existing DHCP lease.
segundo	0:ac1725ba162c	1052	*
segundo	0:ac1725ba162c	1053	* @param netif network interface which must rebind with a DHCP server
segundo	0:ac1725ba162c	1054	*/
segundo	0:ac1725ba162c	1055	static err_t
segundo	0:ac1725ba162c	1056	dhcp_rebind(struct netif *netif)
segundo	0:ac1725ba162c	1057	{
segundo	0:ac1725ba162c	1058	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	1059	err_t result;
segundo	0:ac1725ba162c	1060	u16_t msecs;
segundo	0:ac1725ba162c	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
segundo	0:ac1725ba162c	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
segundo	0:ac1725ba162c	1063
segundo	0:ac1725ba162c	1064	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo	0:ac1725ba162c	1066	if (result == ERR_OK) {
segundo	0:ac1725ba162c	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo	0:ac1725ba162c	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
segundo	0:ac1725ba162c	1069
segundo	0:ac1725ba162c	1070	#if LWIP_NETIF_HOSTNAME
segundo	0:ac1725ba162c	1071	if (netif->hostname != NULL) {
segundo	0:ac1725ba162c	1072	const char p = (const char)netif->hostname;
segundo	0:ac1725ba162c	1073	u8_t namelen = (u8_t)strlen(p);
segundo	0:ac1725ba162c	1074	if (namelen > 0) {
segundo	0:ac1725ba162c	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
segundo	0:ac1725ba162c	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
segundo	0:ac1725ba162c	1077	while (*p) {
segundo	0:ac1725ba162c	1078	dhcp_option_byte(dhcp, *p++);
segundo	0:ac1725ba162c	1079	}
segundo	0:ac1725ba162c	1080	}
segundo	0:ac1725ba162c	1081	}
segundo	0:ac1725ba162c	1082	#endif /* LWIP_NETIF_HOSTNAME */
segundo	0:ac1725ba162c	1083
segundo	0:ac1725ba162c	1084	#if 0
segundo	0:ac1725ba162c	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo	0:ac1725ba162c	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
segundo	0:ac1725ba162c	1087
segundo	0:ac1725ba162c	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
segundo	0:ac1725ba162c	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
segundo	0:ac1725ba162c	1090	#endif
segundo	0:ac1725ba162c	1091
segundo	0:ac1725ba162c	1092	dhcp_option_trailer(dhcp);
segundo	0:ac1725ba162c	1093
segundo	0:ac1725ba162c	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo	0:ac1725ba162c	1095
segundo	0:ac1725ba162c	1096	/* broadcast to server */
segundo	0:ac1725ba162c	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	1098	dhcp_delete_msg(dhcp);
segundo	0:ac1725ba162c	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
segundo	0:ac1725ba162c	1100	} else {
segundo	0:ac1725ba162c	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	1102	}
segundo	0:ac1725ba162c	1103	dhcp->tries++;
segundo	0:ac1725ba162c	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
segundo	0:ac1725ba162c	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	1107	return result;
segundo	0:ac1725ba162c	1108	}
segundo	0:ac1725ba162c	1109
segundo	0:ac1725ba162c	1110	/**
segundo	0:ac1725ba162c	1111	* Enter REBOOTING state to verify an existing lease
segundo	0:ac1725ba162c	1112	*
segundo	0:ac1725ba162c	1113	* @param netif network interface which must reboot
segundo	0:ac1725ba162c	1114	*/
segundo	0:ac1725ba162c	1115	static err_t
segundo	0:ac1725ba162c	1116	dhcp_reboot(struct netif *netif)
segundo	0:ac1725ba162c	1117	{
segundo	0:ac1725ba162c	1118	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	1119	err_t result;
segundo	0:ac1725ba162c	1120	u16_t msecs;
segundo	0:ac1725ba162c	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
segundo	0:ac1725ba162c	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
segundo	0:ac1725ba162c	1123
segundo	0:ac1725ba162c	1124	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
segundo	0:ac1725ba162c	1126	if (result == ERR_OK) {
segundo	0:ac1725ba162c	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
segundo	0:ac1725ba162c	1128	dhcp_option_short(dhcp, 576);
segundo	0:ac1725ba162c	1129
segundo	0:ac1725ba162c	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
segundo	0:ac1725ba162c	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
segundo	0:ac1725ba162c	1132
segundo	0:ac1725ba162c	1133	dhcp_option_trailer(dhcp);
segundo	0:ac1725ba162c	1134
segundo	0:ac1725ba162c	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo	0:ac1725ba162c	1136
segundo	0:ac1725ba162c	1137	/* broadcast to server */
segundo	0:ac1725ba162c	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	1139	dhcp_delete_msg(dhcp);
segundo	0:ac1725ba162c	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
segundo	0:ac1725ba162c	1141	} else {
segundo	0:ac1725ba162c	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	1143	}
segundo	0:ac1725ba162c	1144	dhcp->tries++;
segundo	0:ac1725ba162c	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
segundo	0:ac1725ba162c	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	1148	return result;
segundo	0:ac1725ba162c	1149	}
segundo	0:ac1725ba162c	1150
segundo	0:ac1725ba162c	1151
segundo	0:ac1725ba162c	1152	/**
segundo	0:ac1725ba162c	1153	* Release a DHCP lease.
segundo	0:ac1725ba162c	1154	*
segundo	0:ac1725ba162c	1155	* @param netif network interface which must release its lease
segundo	0:ac1725ba162c	1156	*/
segundo	0:ac1725ba162c	1157	err_t
segundo	0:ac1725ba162c	1158	dhcp_release(struct netif *netif)
segundo	0:ac1725ba162c	1159	{
segundo	0:ac1725ba162c	1160	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	1161	err_t result;
segundo	0:ac1725ba162c	1162	u16_t msecs;
segundo	0:ac1725ba162c	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
segundo	0:ac1725ba162c	1164
segundo	0:ac1725ba162c	1165	/* idle DHCP client */
segundo	0:ac1725ba162c	1166	dhcp_set_state(dhcp, DHCP_OFF);
segundo	0:ac1725ba162c	1167	/* clean old DHCP offer */
segundo	0:ac1725ba162c	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
segundo	0:ac1725ba162c	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
segundo	0:ac1725ba162c	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
segundo	0:ac1725ba162c	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
segundo	0:ac1725ba162c	1172	#if LWIP_DHCP_BOOTP_FILE
segundo	0:ac1725ba162c	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
segundo	0:ac1725ba162c	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
segundo	0:ac1725ba162c	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
segundo	0:ac1725ba162c	1176
segundo	0:ac1725ba162c	1177	/* create and initialize the DHCP message header */
segundo	0:ac1725ba162c	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
segundo	0:ac1725ba162c	1179	if (result == ERR_OK) {
segundo	0:ac1725ba162c	1180	dhcp_option_trailer(dhcp);
segundo	0:ac1725ba162c	1181
segundo	0:ac1725ba162c	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
segundo	0:ac1725ba162c	1183
segundo	0:ac1725ba162c	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
segundo	0:ac1725ba162c	1185	dhcp_delete_msg(dhcp);
segundo	0:ac1725ba162c	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
segundo	0:ac1725ba162c	1187	} else {
segundo	0:ac1725ba162c	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
segundo	0:ac1725ba162c	1189	}
segundo	0:ac1725ba162c	1190	dhcp->tries++;
segundo	0:ac1725ba162c	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
segundo	0:ac1725ba162c	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
segundo	0:ac1725ba162c	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
segundo	0:ac1725ba162c	1194	/* bring the interface down */
segundo	0:ac1725ba162c	1195	netif_set_down(netif);
segundo	0:ac1725ba162c	1196	/* remove IP address from interface */
segundo	0:ac1725ba162c	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
segundo	0:ac1725ba162c	1198	netif_set_gw(netif, IP_ADDR_ANY);
segundo	0:ac1725ba162c	1199	netif_set_netmask(netif, IP_ADDR_ANY);
segundo	0:ac1725ba162c	1200
segundo	0:ac1725ba162c	1201	return result;
segundo	0:ac1725ba162c	1202	}
segundo	0:ac1725ba162c	1203
segundo	0:ac1725ba162c	1204	/**
segundo	0:ac1725ba162c	1205	* Remove the DHCP client from the interface.
segundo	0:ac1725ba162c	1206	*
segundo	0:ac1725ba162c	1207	* @param netif The network interface to stop DHCP on
segundo	0:ac1725ba162c	1208	*/
segundo	0:ac1725ba162c	1209	void
segundo	0:ac1725ba162c	1210	dhcp_stop(struct netif *netif)
segundo	0:ac1725ba162c	1211	{
segundo	0:ac1725ba162c	1212	struct dhcp *dhcp;
segundo	0:ac1725ba162c	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
segundo	0:ac1725ba162c	1214	dhcp = netif->dhcp;
segundo	0:ac1725ba162c	1215	/* Remove the flag that says this netif is handled by DHCP. */
segundo	0:ac1725ba162c	1216	netif->flags &= ~NETIF_FLAG_DHCP;
segundo	0:ac1725ba162c	1217
segundo	0:ac1725ba162c	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
segundo	0:ac1725ba162c	1219	/* netif is DHCP configured? */
segundo	0:ac1725ba162c	1220	if (dhcp != NULL) {
segundo	0:ac1725ba162c	1221	#if LWIP_DHCP_AUTOIP_COOP
segundo	0:ac1725ba162c	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
segundo	0:ac1725ba162c	1223	autoip_stop(netif);
segundo	0:ac1725ba162c	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
segundo	0:ac1725ba162c	1225	}
segundo	0:ac1725ba162c	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
segundo	0:ac1725ba162c	1227
segundo	0:ac1725ba162c	1228	if (dhcp->pcb != NULL) {
segundo	0:ac1725ba162c	1229	udp_remove(dhcp->pcb);
segundo	0:ac1725ba162c	1230	dhcp->pcb = NULL;
segundo	0:ac1725ba162c	1231	}
segundo	0:ac1725ba162c	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
segundo	0:ac1725ba162c	1233	dhcp_set_state(dhcp, DHCP_OFF);
segundo	0:ac1725ba162c	1234	}
segundo	0:ac1725ba162c	1235	}
segundo	0:ac1725ba162c	1236
segundo	0:ac1725ba162c	1237	/*
segundo	0:ac1725ba162c	1238	* Set the DHCP state of a DHCP client.
segundo	0:ac1725ba162c	1239	*
segundo	0:ac1725ba162c	1240	* If the state changed, reset the number of tries.
segundo	0:ac1725ba162c	1241	*/
segundo	0:ac1725ba162c	1242	static void
segundo	0:ac1725ba162c	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
segundo	0:ac1725ba162c	1244	{
segundo	0:ac1725ba162c	1245	if (new_state != dhcp->state) {
segundo	0:ac1725ba162c	1246	dhcp->state = new_state;
segundo	0:ac1725ba162c	1247	dhcp->tries = 0;
segundo	0:ac1725ba162c	1248	dhcp->request_timeout = 0;
segundo	0:ac1725ba162c	1249	}
segundo	0:ac1725ba162c	1250	}
segundo	0:ac1725ba162c	1251
segundo	0:ac1725ba162c	1252	/*
segundo	0:ac1725ba162c	1253	* Concatenate an option type and length field to the outgoing
segundo	0:ac1725ba162c	1254	* DHCP message.
segundo	0:ac1725ba162c	1255	*
segundo	0:ac1725ba162c	1256	*/
segundo	0:ac1725ba162c	1257	static void
segundo	0:ac1725ba162c	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
segundo	0:ac1725ba162c	1259	{
segundo	0:ac1725ba162c	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);
segundo	0:ac1725ba162c	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
segundo	0:ac1725ba162c	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
segundo	0:ac1725ba162c	1263	}
segundo	0:ac1725ba162c	1264	/*
segundo	0:ac1725ba162c	1265	* Concatenate a single byte to the outgoing DHCP message.
segundo	0:ac1725ba162c	1266	*
segundo	0:ac1725ba162c	1267	*/
segundo	0:ac1725ba162c	1268	static void
segundo	0:ac1725ba162c	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
segundo	0:ac1725ba162c	1270	{
segundo	0:ac1725ba162c	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
segundo	0:ac1725ba162c	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
segundo	0:ac1725ba162c	1273	}
segundo	0:ac1725ba162c	1274
segundo	0:ac1725ba162c	1275	static void
segundo	0:ac1725ba162c	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
segundo	0:ac1725ba162c	1277	{
segundo	0:ac1725ba162c	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
segundo	0:ac1725ba162c	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
segundo	0:ac1725ba162c	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
segundo	0:ac1725ba162c	1281	}
segundo	0:ac1725ba162c	1282
segundo	0:ac1725ba162c	1283	static void
segundo	0:ac1725ba162c	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
segundo	0:ac1725ba162c	1285	{
segundo	0:ac1725ba162c	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
segundo	0:ac1725ba162c	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
segundo	0:ac1725ba162c	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
segundo	0:ac1725ba162c	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
segundo	0:ac1725ba162c	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
segundo	0:ac1725ba162c	1291	}
segundo	0:ac1725ba162c	1292
segundo	0:ac1725ba162c	1293	/**
segundo	0:ac1725ba162c	1294	* Extract the DHCP message and the DHCP options.
segundo	0:ac1725ba162c	1295	*
segundo	0:ac1725ba162c	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
segundo	0:ac1725ba162c	1297	* piece of memory. As a DHCP message is variable sized by its options,
segundo	0:ac1725ba162c	1298	* and also allows overriding some fields for options, the easy approach
segundo	0:ac1725ba162c	1299	* is to first unfold the options into a conitguous piece of memory, and
segundo	0:ac1725ba162c	1300	* use that further on.
segundo	0:ac1725ba162c	1301	*
segundo	0:ac1725ba162c	1302	*/
segundo	0:ac1725ba162c	1303	static err_t
segundo	0:ac1725ba162c	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
segundo	0:ac1725ba162c	1305	{
segundo	0:ac1725ba162c	1306	u8_t *options;
segundo	0:ac1725ba162c	1307	u16_t offset;
segundo	0:ac1725ba162c	1308	u16_t offset_max;
segundo	0:ac1725ba162c	1309	u16_t options_idx;
segundo	0:ac1725ba162c	1310	u16_t options_idx_max;
segundo	0:ac1725ba162c	1311	struct pbuf *q;
segundo	0:ac1725ba162c	1312	int parse_file_as_options = 0;
segundo	0:ac1725ba162c	1313	int parse_sname_as_options = 0;
segundo	0:ac1725ba162c	1314
segundo	0:ac1725ba162c	1315	/* clear received options */
segundo	0:ac1725ba162c	1316	dhcp_clear_all_options(dhcp);
segundo	0:ac1725ba162c	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
segundo	0:ac1725ba162c	1318	if (p->len < DHCP_SNAME_OFS) {
segundo	0:ac1725ba162c	1319	return ERR_BUF;
segundo	0:ac1725ba162c	1320	}
segundo	0:ac1725ba162c	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
segundo	0:ac1725ba162c	1322	#if LWIP_DHCP_BOOTP_FILE
segundo	0:ac1725ba162c	1323	/* clear boot file name */
segundo	0:ac1725ba162c	1324	dhcp->boot_file_name[0] = 0;
segundo	0:ac1725ba162c	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
segundo	0:ac1725ba162c	1326
segundo	0:ac1725ba162c	1327	/* parse options */
segundo	0:ac1725ba162c	1328
segundo	0:ac1725ba162c	1329	/* start with options field */
segundo	0:ac1725ba162c	1330	options_idx = DHCP_OPTIONS_OFS;
segundo	0:ac1725ba162c	1331	/* parse options to the end of the received packet */
segundo	0:ac1725ba162c	1332	options_idx_max = p->tot_len;
segundo	0:ac1725ba162c	1333	again:
segundo	0:ac1725ba162c	1334	q = p;
segundo	0:ac1725ba162c	1335	while((q != NULL) && (options_idx >= q->len)) {
segundo	0:ac1725ba162c	1336	options_idx -= q->len;
segundo	0:ac1725ba162c	1337	options_idx_max -= q->len;
segundo	0:ac1725ba162c	1338	q = q->next;
segundo	0:ac1725ba162c	1339	}
segundo	0:ac1725ba162c	1340	if (q == NULL) {
segundo	0:ac1725ba162c	1341	return ERR_BUF;
segundo	0:ac1725ba162c	1342	}
segundo	0:ac1725ba162c	1343	offset = options_idx;
segundo	0:ac1725ba162c	1344	offset_max = options_idx_max;
segundo	0:ac1725ba162c	1345	options = (u8_t*)q->payload;
segundo	0:ac1725ba162c	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
segundo	0:ac1725ba162c	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
segundo	0:ac1725ba162c	1348	u8_t op = options[offset];
segundo	0:ac1725ba162c	1349	u8_t len;
segundo	0:ac1725ba162c	1350	u8_t decode_len = 0;
segundo	0:ac1725ba162c	1351	int decode_idx = -1;
segundo	0:ac1725ba162c	1352	u16_t val_offset = offset + 2;
segundo	0:ac1725ba162c	1353	/* len byte might be in the next pbuf */
segundo	0:ac1725ba162c	1354	if (offset + 1 < q->len) {
segundo	0:ac1725ba162c	1355	len = options[offset + 1];
segundo	0:ac1725ba162c	1356	} else {
segundo	0:ac1725ba162c	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
segundo	0:ac1725ba162c	1358	}
segundo	0:ac1725ba162c	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
segundo	0:ac1725ba162c	1360	decode_len = len;
segundo	0:ac1725ba162c	1361	switch(op) {
segundo	0:ac1725ba162c	1362	/* case(DHCP_OPTION_END): handled above */
segundo	0:ac1725ba162c	1363	case(DHCP_OPTION_PAD):
segundo	0:ac1725ba162c	1364	/* special option: no len encoded */
segundo	0:ac1725ba162c	1365	decode_len = len = 0;
segundo	0:ac1725ba162c	1366	/* will be increased below */
segundo	0:ac1725ba162c	1367	offset--;
segundo	0:ac1725ba162c	1368	break;
segundo	0:ac1725ba162c	1369	case(DHCP_OPTION_SUBNET_MASK):
segundo	0:ac1725ba162c	1370	LWIP_ASSERT("len == 4", len == 4);
segundo	0:ac1725ba162c	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
segundo	0:ac1725ba162c	1372	break;
segundo	0:ac1725ba162c	1373	case(DHCP_OPTION_ROUTER):
segundo	0:ac1725ba162c	1374	decode_len = 4; /* only copy the first given router */
segundo	0:ac1725ba162c	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
segundo	0:ac1725ba162c	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
segundo	0:ac1725ba162c	1377	break;
segundo	0:ac1725ba162c	1378	case(DHCP_OPTION_DNS_SERVER):
segundo	0:ac1725ba162c	1379	/* special case: there might be more than one server */
segundo	0:ac1725ba162c	1380	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
segundo	0:ac1725ba162c	1381	/* limit number of DNS servers */
segundo	0:ac1725ba162c	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
segundo	0:ac1725ba162c	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
segundo	0:ac1725ba162c	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
segundo	0:ac1725ba162c	1385	break;
segundo	0:ac1725ba162c	1386	case(DHCP_OPTION_LEASE_TIME):
segundo	0:ac1725ba162c	1387	LWIP_ASSERT("len == 4", len == 4);
segundo	0:ac1725ba162c	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
segundo	0:ac1725ba162c	1389	break;
segundo	0:ac1725ba162c	1390	case(DHCP_OPTION_OVERLOAD):
segundo	0:ac1725ba162c	1391	LWIP_ASSERT("len == 1", len == 1);
segundo	0:ac1725ba162c	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
segundo	0:ac1725ba162c	1393	break;
segundo	0:ac1725ba162c	1394	case(DHCP_OPTION_MESSAGE_TYPE):
segundo	0:ac1725ba162c	1395	LWIP_ASSERT("len == 1", len == 1);
segundo	0:ac1725ba162c	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
segundo	0:ac1725ba162c	1397	break;
segundo	0:ac1725ba162c	1398	case(DHCP_OPTION_SERVER_ID):
segundo	0:ac1725ba162c	1399	LWIP_ASSERT("len == 4", len == 4);
segundo	0:ac1725ba162c	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
segundo	0:ac1725ba162c	1401	break;
segundo	0:ac1725ba162c	1402	case(DHCP_OPTION_T1):
segundo	0:ac1725ba162c	1403	LWIP_ASSERT("len == 4", len == 4);
segundo	0:ac1725ba162c	1404	decode_idx = DHCP_OPTION_IDX_T1;
segundo	0:ac1725ba162c	1405	break;
segundo	0:ac1725ba162c	1406	case(DHCP_OPTION_T2):
segundo	0:ac1725ba162c	1407	LWIP_ASSERT("len == 4", len == 4);
segundo	0:ac1725ba162c	1408	decode_idx = DHCP_OPTION_IDX_T2;
segundo	0:ac1725ba162c	1409	break;
segundo	0:ac1725ba162c	1410	default:
segundo	0:ac1725ba162c	1411	decode_len = 0;
segundo	0:ac1725ba162c	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
segundo	0:ac1725ba162c	1413	break;
segundo	0:ac1725ba162c	1414	}
segundo	0:ac1725ba162c	1415	offset += len + 2;
segundo	0:ac1725ba162c	1416	if (decode_len > 0) {
segundo	0:ac1725ba162c	1417	u32_t value = 0;
segundo	0:ac1725ba162c	1418	u16_t copy_len;
segundo	0:ac1725ba162c	1419	decode_next:
segundo	0:ac1725ba162c	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
segundo	0:ac1725ba162c	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
segundo	0:ac1725ba162c	1422	copy_len = LWIP_MIN(decode_len, 4);
segundo	0:ac1725ba162c	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
segundo	0:ac1725ba162c	1424	if (decode_len > 4) {
segundo	0:ac1725ba162c	1425	/* decode more than one u32_t */
segundo	0:ac1725ba162c	1426	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
segundo	0:ac1725ba162c	1427	dhcp_got_option(dhcp, decode_idx);
segundo	0:ac1725ba162c	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
segundo	0:ac1725ba162c	1429	decode_len -= 4;
segundo	0:ac1725ba162c	1430	val_offset += 4;
segundo	0:ac1725ba162c	1431	decode_idx++;
segundo	0:ac1725ba162c	1432	goto decode_next;
segundo	0:ac1725ba162c	1433	} else if (decode_len == 4) {
segundo	0:ac1725ba162c	1434	value = ntohl(value);
segundo	0:ac1725ba162c	1435	} else {
segundo	0:ac1725ba162c	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
segundo	0:ac1725ba162c	1437	value = ((u8_t*)&value)[0];
segundo	0:ac1725ba162c	1438	}
segundo	0:ac1725ba162c	1439	dhcp_got_option(dhcp, decode_idx);
segundo	0:ac1725ba162c	1440	dhcp_set_option_value(dhcp, decode_idx, value);
segundo	0:ac1725ba162c	1441	}
segundo	0:ac1725ba162c	1442	if (offset >= q->len) {
segundo	0:ac1725ba162c	1443	offset -= q->len;
segundo	0:ac1725ba162c	1444	offset_max -= q->len;
segundo	0:ac1725ba162c	1445	q = q->next;
segundo	0:ac1725ba162c	1446	options = (u8_t*)q->payload;
segundo	0:ac1725ba162c	1447	}
segundo	0:ac1725ba162c	1448	}
segundo	0:ac1725ba162c	1449	/* is this an overloaded message? */
segundo	0:ac1725ba162c	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
segundo	0:ac1725ba162c	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
segundo	0:ac1725ba162c	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
segundo	0:ac1725ba162c	1453	if (overload == DHCP_OVERLOAD_FILE) {
segundo	0:ac1725ba162c	1454	parse_file_as_options = 1;
segundo	0:ac1725ba162c	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
segundo	0:ac1725ba162c	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
segundo	0:ac1725ba162c	1457	parse_sname_as_options = 1;
segundo	0:ac1725ba162c	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
segundo	0:ac1725ba162c	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
segundo	0:ac1725ba162c	1460	parse_sname_as_options = 1;
segundo	0:ac1725ba162c	1461	parse_file_as_options = 1;
segundo	0:ac1725ba162c	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
segundo	0:ac1725ba162c	1463	} else {
segundo	0:ac1725ba162c	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
segundo	0:ac1725ba162c	1465	}
segundo	0:ac1725ba162c	1466	#if LWIP_DHCP_BOOTP_FILE
segundo	0:ac1725ba162c	1467	if (!parse_file_as_options) {
segundo	0:ac1725ba162c	1468	/* only do this for ACK messages */
segundo	0:ac1725ba162c	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
segundo	0:ac1725ba162c	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
segundo	0:ac1725ba162c	1471	/* copy bootp file name, don't care for sname (server hostname) */
segundo	0:ac1725ba162c	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
segundo	0:ac1725ba162c	1473	/* make sure the string is really NULL-terminated */
segundo	0:ac1725ba162c	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
segundo	0:ac1725ba162c	1475	}
segundo	0:ac1725ba162c	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
segundo	0:ac1725ba162c	1477	}
segundo	0:ac1725ba162c	1478	if (parse_file_as_options) {
segundo	0:ac1725ba162c	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
segundo	0:ac1725ba162c	1480	parse_file_as_options = 0;
segundo	0:ac1725ba162c	1481	options_idx = DHCP_FILE_OFS;
segundo	0:ac1725ba162c	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
segundo	0:ac1725ba162c	1483	goto again;
segundo	0:ac1725ba162c	1484	} else if (parse_sname_as_options) {
segundo	0:ac1725ba162c	1485	parse_sname_as_options = 0;
segundo	0:ac1725ba162c	1486	options_idx = DHCP_SNAME_OFS;
segundo	0:ac1725ba162c	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
segundo	0:ac1725ba162c	1488	goto again;
segundo	0:ac1725ba162c	1489	}
segundo	0:ac1725ba162c	1490	return ERR_OK;
segundo	0:ac1725ba162c	1491	}
segundo	0:ac1725ba162c	1492
segundo	0:ac1725ba162c	1493	/**
segundo	0:ac1725ba162c	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
segundo	0:ac1725ba162c	1495	*/
segundo	0:ac1725ba162c	1496	static void
segundo	0:ac1725ba162c	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
segundo	0:ac1725ba162c	1498	{
segundo	0:ac1725ba162c	1499	struct netif netif = (struct netif )arg;
segundo	0:ac1725ba162c	1500	struct dhcp *dhcp = netif->dhcp;
segundo	0:ac1725ba162c	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
segundo	0:ac1725ba162c	1502	u8_t msg_type;
segundo	0:ac1725ba162c	1503	u8_t i;
segundo	0:ac1725ba162c	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,
segundo	0:ac1725ba162c	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
segundo	0:ac1725ba162c	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
segundo	0:ac1725ba162c	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
segundo	0:ac1725ba162c	1508	/* prevent warnings about unused arguments */
segundo	0:ac1725ba162c	1509	LWIP_UNUSED_ARG(pcb);
segundo	0:ac1725ba162c	1510	LWIP_UNUSED_ARG(addr);
segundo	0:ac1725ba162c	1511	LWIP_UNUSED_ARG(port);
segundo	0:ac1725ba162c	1512
segundo	0:ac1725ba162c	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
segundo	0:ac1725ba162c	1514
segundo	0:ac1725ba162c	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
segundo	0:ac1725ba162c	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
segundo	0:ac1725ba162c	1517	goto free_pbuf_and_return;
segundo	0:ac1725ba162c	1518	}
segundo	0:ac1725ba162c	1519
segundo	0:ac1725ba162c	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	1522	goto free_pbuf_and_return;
segundo	0:ac1725ba162c	1523	}
segundo	0:ac1725ba162c	1524	/* iterate through hardware address and match against DHCP message */
segundo	0:ac1725ba162c	1525	for (i = 0; i < netif->hwaddr_len; i++) {
segundo	0:ac1725ba162c	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
segundo	0:ac1725ba162c	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
segundo	0:ac1725ba162c	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
segundo	0:ac1725ba162c	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
segundo	0:ac1725ba162c	1530	goto free_pbuf_and_return;
segundo	0:ac1725ba162c	1531	}
segundo	0:ac1725ba162c	1532	}
segundo	0:ac1725ba162c	1533	/* match transaction ID against what we expected */
segundo	0:ac1725ba162c	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
segundo	0:ac1725ba162c	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
segundo	0:ac1725ba162c	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
segundo	0:ac1725ba162c	1537	goto free_pbuf_and_return;
segundo	0:ac1725ba162c	1538	}
segundo	0:ac1725ba162c	1539	/* option fields could be unfold? */
segundo	0:ac1725ba162c	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
segundo	0:ac1725ba162c	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
segundo	0:ac1725ba162c	1542	("problem unfolding DHCP message - too short on memory?\n"));
segundo	0:ac1725ba162c	1543	goto free_pbuf_and_return;
segundo	0:ac1725ba162c	1544	}
segundo	0:ac1725ba162c	1545
segundo	0:ac1725ba162c	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
segundo	0:ac1725ba162c	1547	/* obtain pointer to DHCP message type */
segundo	0:ac1725ba162c	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
segundo	0:ac1725ba162c	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
segundo	0:ac1725ba162c	1550	goto free_pbuf_and_return;
segundo	0:ac1725ba162c	1551	}
segundo	0:ac1725ba162c	1552
segundo	0:ac1725ba162c	1553	/* read DHCP message type */
segundo	0:ac1725ba162c	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
segundo	0:ac1725ba162c	1555	/* message type is DHCP ACK? */
segundo	0:ac1725ba162c	1556	if (msg_type == DHCP_ACK) {
segundo	0:ac1725ba162c	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
segundo	0:ac1725ba162c	1558	/* in requesting state? */
segundo	0:ac1725ba162c	1559	if (dhcp->state == DHCP_REQUESTING) {
segundo	0:ac1725ba162c	1560	dhcp_handle_ack(netif);
segundo	0:ac1725ba162c	1561	#if DHCP_DOES_ARP_CHECK
segundo	0:ac1725ba162c	1562	/* check if the acknowledged lease address is already in use */
segundo	0:ac1725ba162c	1563	dhcp_check(netif);
segundo	0:ac1725ba162c	1564	#else
segundo	0:ac1725ba162c	1565	/* bind interface to the acknowledged lease address */
segundo	0:ac1725ba162c	1566	dhcp_bind(netif);
segundo	0:ac1725ba162c	1567	#endif
segundo	0:ac1725ba162c	1568	}
segundo	0:ac1725ba162c	1569	/* already bound to the given lease address? */
segundo	0:ac1725ba162c	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
segundo	0:ac1725ba162c	1571	dhcp_bind(netif);
segundo	0:ac1725ba162c	1572	}
segundo	0:ac1725ba162c	1573	}
segundo	0:ac1725ba162c	1574	/* received a DHCP_NAK in appropriate state? */
segundo	0:ac1725ba162c	1575	else if ((msg_type == DHCP_NAK) &&
segundo	0:ac1725ba162c	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
segundo	0:ac1725ba162c	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
segundo	0:ac1725ba162c	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
segundo	0:ac1725ba162c	1579	dhcp_handle_nak(netif);
segundo	0:ac1725ba162c	1580	}
segundo	0:ac1725ba162c	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
segundo	0:ac1725ba162c	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
segundo	0:ac1725ba162c	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
segundo	0:ac1725ba162c	1584	dhcp->request_timeout = 0;
segundo	0:ac1725ba162c	1585	/* remember offered lease */
segundo	0:ac1725ba162c	1586	dhcp_handle_offer(netif);
segundo	0:ac1725ba162c	1587	}
segundo	0:ac1725ba162c	1588	free_pbuf_and_return:
segundo	0:ac1725ba162c	1589	dhcp->msg_in = NULL;
segundo	0:ac1725ba162c	1590	pbuf_free(p);
segundo	0:ac1725ba162c	1591	}
segundo	0:ac1725ba162c	1592
segundo	0:ac1725ba162c	1593	/**
segundo	0:ac1725ba162c	1594	* Create a DHCP request, fill in common headers
segundo	0:ac1725ba162c	1595	*
segundo	0:ac1725ba162c	1596	* @param netif the netif under DHCP control
segundo	0:ac1725ba162c	1597	* @param dhcp dhcp control struct
segundo	0:ac1725ba162c	1598	* @param message_type message type of the request
segundo	0:ac1725ba162c	1599	*/
segundo	0:ac1725ba162c	1600	static err_t
segundo	0:ac1725ba162c	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
segundo	0:ac1725ba162c	1602	{
segundo	0:ac1725ba162c	1603	u16_t i;
segundo	0:ac1725ba162c	1604	#ifndef DHCP_GLOBAL_XID
segundo	0:ac1725ba162c	1605	/** default global transaction identifier starting value (easy to match
segundo	0:ac1725ba162c	1606	* with a packet analyser). We simply increment for each new request.
segundo	0:ac1725ba162c	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
segundo	0:ac1725ba162c	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
segundo	0:ac1725ba162c	1609	static u32_t xid = 0xABCD0000;
segundo	0:ac1725ba162c	1610	#else
segundo	0:ac1725ba162c	1611	static u32_t xid;
segundo	0:ac1725ba162c	1612	static u8_t xid_initialised = 0;
segundo	0:ac1725ba162c	1613	if (!xid_initialised) {
segundo	0:ac1725ba162c	1614	xid = DHCP_GLOBAL_XID;
segundo	0:ac1725ba162c	1615	xid_initialised = !xid_initialised;
segundo	0:ac1725ba162c	1616	}
segundo	0:ac1725ba162c	1617	#endif
segundo	0:ac1725ba162c	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
segundo	0:ac1725ba162c	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
segundo	0:ac1725ba162c	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
segundo	0:ac1725ba162c	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
segundo	0:ac1725ba162c	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
segundo	0:ac1725ba162c	1623	if (dhcp->p_out == NULL) {
segundo	0:ac1725ba162c	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
segundo	0:ac1725ba162c	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
segundo	0:ac1725ba162c	1626	return ERR_MEM;
segundo	0:ac1725ba162c	1627	}
segundo	0:ac1725ba162c	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
segundo	0:ac1725ba162c	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
segundo	0:ac1725ba162c	1630
segundo	0:ac1725ba162c	1631	/* reuse transaction identifier in retransmissions */
segundo	0:ac1725ba162c	1632	if (dhcp->tries == 0) {
segundo	0:ac1725ba162c	1633	xid++;
segundo	0:ac1725ba162c	1634	}
segundo	0:ac1725ba162c	1635	dhcp->xid = xid;
segundo	0:ac1725ba162c	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
segundo	0:ac1725ba162c	1637	("transaction id xid(%"X32_F")\n", xid));
segundo	0:ac1725ba162c	1638
segundo	0:ac1725ba162c	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
segundo	0:ac1725ba162c	1640
segundo	0:ac1725ba162c	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
segundo	0:ac1725ba162c	1642	/* TODO: make link layer independent */
segundo	0:ac1725ba162c	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
segundo	0:ac1725ba162c	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
segundo	0:ac1725ba162c	1645	dhcp->msg_out->hops = 0;
segundo	0:ac1725ba162c	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
segundo	0:ac1725ba162c	1647	dhcp->msg_out->secs = 0;
segundo	0:ac1725ba162c	1648	/* we don't need the broadcast flag since we can receive unicast traffic
segundo	0:ac1725ba162c	1649	before being fully configured! */
segundo	0:ac1725ba162c	1650	dhcp->msg_out->flags = 0;
segundo	0:ac1725ba162c	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
segundo	0:ac1725ba162c	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
segundo	0:ac1725ba162c	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
segundo	0:ac1725ba162c	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
segundo	0:ac1725ba162c	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
segundo	0:ac1725ba162c	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
segundo	0:ac1725ba162c	1657	}
segundo	0:ac1725ba162c	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
segundo	0:ac1725ba162c	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
segundo	0:ac1725ba162c	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
segundo	0:ac1725ba162c	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
segundo	0:ac1725ba162c	1662	/* copy netif hardware address, pad with zeroes */
segundo	0:ac1725ba162c	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
segundo	0:ac1725ba162c	1664	}
segundo	0:ac1725ba162c	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
segundo	0:ac1725ba162c	1666	dhcp->msg_out->sname[i] = 0;
segundo	0:ac1725ba162c	1667	}
segundo	0:ac1725ba162c	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
segundo	0:ac1725ba162c	1669	dhcp->msg_out->file[i] = 0;
segundo	0:ac1725ba162c	1670	}
segundo	0:ac1725ba162c	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
segundo	0:ac1725ba162c	1672	dhcp->options_out_len = 0;
segundo	0:ac1725ba162c	1673	/* fill options field with an incrementing array (for debugging purposes) */
segundo	0:ac1725ba162c	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
segundo	0:ac1725ba162c	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
segundo	0:ac1725ba162c	1676	}
segundo	0:ac1725ba162c	1677	/* Add option MESSAGE_TYPE */
segundo	0:ac1725ba162c	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
segundo	0:ac1725ba162c	1679	dhcp_option_byte(dhcp, message_type);
segundo	0:ac1725ba162c	1680	return ERR_OK;
segundo	0:ac1725ba162c	1681	}
segundo	0:ac1725ba162c	1682
segundo	0:ac1725ba162c	1683	/**
segundo	0:ac1725ba162c	1684	* Free previously allocated memory used to send a DHCP request.
segundo	0:ac1725ba162c	1685	*
segundo	0:ac1725ba162c	1686	* @param dhcp the dhcp struct to free the request from
segundo	0:ac1725ba162c	1687	*/
segundo	0:ac1725ba162c	1688	static void
segundo	0:ac1725ba162c	1689	dhcp_delete_msg(struct dhcp *dhcp)
segundo	0:ac1725ba162c	1690	{
segundo	0:ac1725ba162c	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
segundo	0:ac1725ba162c	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
segundo	0:ac1725ba162c	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
segundo	0:ac1725ba162c	1694	if (dhcp->p_out != NULL) {
segundo	0:ac1725ba162c	1695	pbuf_free(dhcp->p_out);
segundo	0:ac1725ba162c	1696	}
segundo	0:ac1725ba162c	1697	dhcp->p_out = NULL;
segundo	0:ac1725ba162c	1698	dhcp->msg_out = NULL;
segundo	0:ac1725ba162c	1699	}
segundo	0:ac1725ba162c	1700
segundo	0:ac1725ba162c	1701	/**
segundo	0:ac1725ba162c	1702	* Add a DHCP message trailer
segundo	0:ac1725ba162c	1703	*
segundo	0:ac1725ba162c	1704	* Adds the END option to the DHCP message, and if
segundo	0:ac1725ba162c	1705	* necessary, up to three padding bytes.
segundo	0:ac1725ba162c	1706	*
segundo	0:ac1725ba162c	1707	* @param dhcp DHCP state structure
segundo	0:ac1725ba162c	1708	*/
segundo	0:ac1725ba162c	1709	static void
segundo	0:ac1725ba162c	1710	dhcp_option_trailer(struct dhcp *dhcp)
segundo	0:ac1725ba162c	1711	{
segundo	0:ac1725ba162c	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
segundo	0:ac1725ba162c	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
segundo	0:ac1725ba162c	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
segundo	0:ac1725ba162c	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
segundo	0:ac1725ba162c	1716	/* packet is too small, or not 4 byte aligned? */
segundo	0:ac1725ba162c	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
segundo	0:ac1725ba162c	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)); */
segundo	0:ac1725ba162c	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
segundo	0:ac1725ba162c	1720	/* add a fill/padding byte */
segundo	0:ac1725ba162c	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
segundo	0:ac1725ba162c	1722	}
segundo	0:ac1725ba162c	1723	}
segundo	0:ac1725ba162c	1724
segundo	0:ac1725ba162c	1725	#endif /* LWIP_DHCP */

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Type:	Library
Created:	09 Nov 2010
Imports:	3034
Forks:	1
Commits:	8
Dependents:	42
Dependencies:	0
Followers:	27

lwip/core/dhcp.c@7:4e2468d7d5cb, 2010-12-15 (annotated)

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