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NetTribute library with debug turned on in FShandler Donatien Garner -> Segundo Equipo -> this version

lwip/core/dhcp.c@0:281d6ff68967, 2010-11-19 (annotated)

Committer:: hexley
Date:: Fri Nov 19 01:54:45 2010 +0000
Revision:: 0:281d6ff68967

Who changed what in which revision?

User	Revision	Line number	New contents of line
hexley	0:281d6ff68967	1	/**
hexley	0:281d6ff68967	2	* @file
hexley	0:281d6ff68967	3	* Dynamic Host Configuration Protocol client
hexley	0:281d6ff68967	4	*
hexley	0:281d6ff68967	5	*/
hexley	0:281d6ff68967	6
hexley	0:281d6ff68967	7	/*
hexley	0:281d6ff68967	8	*
hexley	0:281d6ff68967	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
hexley	0:281d6ff68967	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
hexley	0:281d6ff68967	11	* All rights reserved.
hexley	0:281d6ff68967	12	*
hexley	0:281d6ff68967	13	* Redistribution and use in source and binary forms, with or without modification,
hexley	0:281d6ff68967	14	* are permitted provided that the following conditions are met:
hexley	0:281d6ff68967	15	*
hexley	0:281d6ff68967	16	* 1. Redistributions of source code must retain the above copyright notice,
hexley	0:281d6ff68967	17	* this list of conditions and the following disclaimer.
hexley	0:281d6ff68967	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
hexley	0:281d6ff68967	19	* this list of conditions and the following disclaimer in the documentation
hexley	0:281d6ff68967	20	* and/or other materials provided with the distribution.
hexley	0:281d6ff68967	21	* 3. The name of the author may not be used to endorse or promote products
hexley	0:281d6ff68967	22	* derived from this software without specific prior written permission.
hexley	0:281d6ff68967	23	*
hexley	0:281d6ff68967	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hexley	0:281d6ff68967	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hexley	0:281d6ff68967	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hexley	0:281d6ff68967	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hexley	0:281d6ff68967	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hexley	0:281d6ff68967	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hexley	0:281d6ff68967	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hexley	0:281d6ff68967	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hexley	0:281d6ff68967	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hexley	0:281d6ff68967	33	* OF SUCH DAMAGE.
hexley	0:281d6ff68967	34	*
hexley	0:281d6ff68967	35	* This file is a contribution to the lwIP TCP/IP stack.
hexley	0:281d6ff68967	36	* The Swedish Institute of Computer Science and Adam Dunkels
hexley	0:281d6ff68967	37	* are specifically granted permission to redistribute this
hexley	0:281d6ff68967	38	* source code.
hexley	0:281d6ff68967	39	*
hexley	0:281d6ff68967	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
hexley	0:281d6ff68967	41	*
hexley	0:281d6ff68967	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
hexley	0:281d6ff68967	43	* with RFC 2131 and RFC 2132.
hexley	0:281d6ff68967	44	*
hexley	0:281d6ff68967	45	* TODO:
hexley	0:281d6ff68967	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
hexley	0:281d6ff68967	47	*
hexley	0:281d6ff68967	48	* Please coordinate changes and requests with Leon Woestenberg
hexley	0:281d6ff68967	49	* <leon.woestenberg@gmx.net>
hexley	0:281d6ff68967	50	*
hexley	0:281d6ff68967	51	* Integration with your code:
hexley	0:281d6ff68967	52	*
hexley	0:281d6ff68967	53	* In lwip/dhcp.h
hexley	0:281d6ff68967	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
hexley	0:281d6ff68967	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
hexley	0:281d6ff68967	56	*
hexley	0:281d6ff68967	57	* Then have your application call dhcp_coarse_tmr() and
hexley	0:281d6ff68967	58	* dhcp_fine_tmr() on the defined intervals.
hexley	0:281d6ff68967	59	*
hexley	0:281d6ff68967	60	* dhcp_start(struct netif *netif);
hexley	0:281d6ff68967	61	* starts a DHCP client instance which configures the interface by
hexley	0:281d6ff68967	62	* obtaining an IP address lease and maintaining it.
hexley	0:281d6ff68967	63	*
hexley	0:281d6ff68967	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
hexley	0:281d6ff68967	65	* to remove the DHCP client.
hexley	0:281d6ff68967	66	*
hexley	0:281d6ff68967	67	*/
hexley	0:281d6ff68967	68
hexley	0:281d6ff68967	69	#include "lwip/opt.h"
hexley	0:281d6ff68967	70
hexley	0:281d6ff68967	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
hexley	0:281d6ff68967	72
hexley	0:281d6ff68967	73	#include "lwip/stats.h"
hexley	0:281d6ff68967	74	#include "lwip/mem.h"
hexley	0:281d6ff68967	75	#include "lwip/udp.h"
hexley	0:281d6ff68967	76	#include "lwip/ip_addr.h"
hexley	0:281d6ff68967	77	#include "lwip/netif.h"
hexley	0:281d6ff68967	78	#include "lwip/def.h"
hexley	0:281d6ff68967	79	#include "lwip/sys.h"
hexley	0:281d6ff68967	80	#include "lwip/dhcp.h"
hexley	0:281d6ff68967	81	#include "lwip/autoip.h"
hexley	0:281d6ff68967	82	#include "lwip/dns.h"
hexley	0:281d6ff68967	83	#include "netif/etharp.h"
hexley	0:281d6ff68967	84
hexley	0:281d6ff68967	85	#include <string.h>
hexley	0:281d6ff68967	86
hexley	0:281d6ff68967	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
hexley	0:281d6ff68967	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
hexley	0:281d6ff68967	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
hexley	0:281d6ff68967	90	* #define DHCP_GLOBAL_XID rand()
hexley	0:281d6ff68967	91	*/
hexley	0:281d6ff68967	92	#ifdef DHCP_GLOBAL_XID_HEADER
hexley	0:281d6ff68967	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
hexley	0:281d6ff68967	94	#endif
hexley	0:281d6ff68967	95
hexley	0:281d6ff68967	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
hexley	0:281d6ff68967	97	* MTU is checked to be big enough in dhcp_start */
hexley	0:281d6ff68967	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
hexley	0:281d6ff68967	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
hexley	0:281d6ff68967	100	/** Minimum length for reply before packet is parsed */
hexley	0:281d6ff68967	101	#define DHCP_MIN_REPLY_LEN 44
hexley	0:281d6ff68967	102
hexley	0:281d6ff68967	103	#define REBOOT_TRIES 2
hexley	0:281d6ff68967	104
hexley	0:281d6ff68967	105	/** Option handling: options are parsed in dhcp_parse_reply
hexley	0:281d6ff68967	106	* and saved in an array where other functions can load them from.
hexley	0:281d6ff68967	107	* This might be moved into the struct dhcp (not necessarily since
hexley	0:281d6ff68967	108	* lwIP is single-threaded and the array is only used while in recv
hexley	0:281d6ff68967	109	* callback). */
hexley	0:281d6ff68967	110	#define DHCP_OPTION_IDX_OVERLOAD 0
hexley	0:281d6ff68967	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
hexley	0:281d6ff68967	112	#define DHCP_OPTION_IDX_SERVER_ID 2
hexley	0:281d6ff68967	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
hexley	0:281d6ff68967	114	#define DHCP_OPTION_IDX_T1 4
hexley	0:281d6ff68967	115	#define DHCP_OPTION_IDX_T2 5
hexley	0:281d6ff68967	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
hexley	0:281d6ff68967	117	#define DHCP_OPTION_IDX_ROUTER 7
hexley	0:281d6ff68967	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
hexley	0:281d6ff68967	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
hexley	0:281d6ff68967	120
hexley	0:281d6ff68967	121	/** Holds the decoded option values, only valid while in dhcp_recv.
hexley	0:281d6ff68967	122	@todo: move this into struct dhcp? */
hexley	0:281d6ff68967	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
hexley	0:281d6ff68967	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
hexley	0:281d6ff68967	125	only valid while in dhcp_recv.
hexley	0:281d6ff68967	126	@todo: move this into struct dhcp? */
hexley	0:281d6ff68967	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
hexley	0:281d6ff68967	128
hexley	0:281d6ff68967	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
hexley	0:281d6ff68967	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
hexley	0:281d6ff68967	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
hexley	0:281d6ff68967	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
hexley	0:281d6ff68967	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
hexley	0:281d6ff68967	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
hexley	0:281d6ff68967	135
hexley	0:281d6ff68967	136
hexley	0:281d6ff68967	137	/* DHCP client state machine functions */
hexley	0:281d6ff68967	138	static err_t dhcp_discover(struct netif *netif);
hexley	0:281d6ff68967	139	static err_t dhcp_select(struct netif *netif);
hexley	0:281d6ff68967	140	static void dhcp_bind(struct netif *netif);
hexley	0:281d6ff68967	141	#if DHCP_DOES_ARP_CHECK
hexley	0:281d6ff68967	142	static err_t dhcp_decline(struct netif *netif);
hexley	0:281d6ff68967	143	#endif /* DHCP_DOES_ARP_CHECK */
hexley	0:281d6ff68967	144	static err_t dhcp_rebind(struct netif *netif);
hexley	0:281d6ff68967	145	static err_t dhcp_reboot(struct netif *netif);
hexley	0:281d6ff68967	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
hexley	0:281d6ff68967	147
hexley	0:281d6ff68967	148	/* receive, unfold, parse and free incoming messages */
hexley	0:281d6ff68967	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
hexley	0:281d6ff68967	150
hexley	0:281d6ff68967	151	/* set the DHCP timers */
hexley	0:281d6ff68967	152	static void dhcp_timeout(struct netif *netif);
hexley	0:281d6ff68967	153	static void dhcp_t1_timeout(struct netif *netif);
hexley	0:281d6ff68967	154	static void dhcp_t2_timeout(struct netif *netif);
hexley	0:281d6ff68967	155
hexley	0:281d6ff68967	156	/* build outgoing messages */
hexley	0:281d6ff68967	157	/* create a DHCP message, fill in common headers */
hexley	0:281d6ff68967	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
hexley	0:281d6ff68967	159	/* free a DHCP request */
hexley	0:281d6ff68967	160	static void dhcp_delete_msg(struct dhcp *dhcp);
hexley	0:281d6ff68967	161	/* add a DHCP option (type, then length in bytes) */
hexley	0:281d6ff68967	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
hexley	0:281d6ff68967	163	/* add option values */
hexley	0:281d6ff68967	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
hexley	0:281d6ff68967	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
hexley	0:281d6ff68967	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
hexley	0:281d6ff68967	167	/* always add the DHCP options trailer to end and pad */
hexley	0:281d6ff68967	168	static void dhcp_option_trailer(struct dhcp *dhcp);
hexley	0:281d6ff68967	169
hexley	0:281d6ff68967	170	/**
hexley	0:281d6ff68967	171	* Back-off the DHCP client (because of a received NAK response).
hexley	0:281d6ff68967	172	*
hexley	0:281d6ff68967	173	* Back-off the DHCP client because of a received NAK. Receiving a
hexley	0:281d6ff68967	174	* NAK means the client asked for something non-sensible, for
hexley	0:281d6ff68967	175	* example when it tries to renew a lease obtained on another network.
hexley	0:281d6ff68967	176	*
hexley	0:281d6ff68967	177	* We clear any existing set IP address and restart DHCP negotiation
hexley	0:281d6ff68967	178	* afresh (as per RFC2131 3.2.3).
hexley	0:281d6ff68967	179	*
hexley	0:281d6ff68967	180	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	181	*/
hexley	0:281d6ff68967	182	static void
hexley	0:281d6ff68967	183	dhcp_handle_nak(struct netif *netif)
hexley	0:281d6ff68967	184	{
hexley	0:281d6ff68967	185	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
hexley	0:281d6ff68967	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
hexley	0:281d6ff68967	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
hexley	0:281d6ff68967	189	netif_set_down(netif);
hexley	0:281d6ff68967	190	/* remove IP address from interface */
hexley	0:281d6ff68967	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
hexley	0:281d6ff68967	192	netif_set_gw(netif, IP_ADDR_ANY);
hexley	0:281d6ff68967	193	netif_set_netmask(netif, IP_ADDR_ANY);
hexley	0:281d6ff68967	194	/* Change to a defined state */
hexley	0:281d6ff68967	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
hexley	0:281d6ff68967	196	/* We can immediately restart discovery */
hexley	0:281d6ff68967	197	dhcp_discover(netif);
hexley	0:281d6ff68967	198	}
hexley	0:281d6ff68967	199
hexley	0:281d6ff68967	200	#if DHCP_DOES_ARP_CHECK
hexley	0:281d6ff68967	201	/**
hexley	0:281d6ff68967	202	* Checks if the offered IP address is already in use.
hexley	0:281d6ff68967	203	*
hexley	0:281d6ff68967	204	* It does so by sending an ARP request for the offered address and
hexley	0:281d6ff68967	205	* entering CHECKING state. If no ARP reply is received within a small
hexley	0:281d6ff68967	206	* interval, the address is assumed to be free for use by us.
hexley	0:281d6ff68967	207	*
hexley	0:281d6ff68967	208	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	209	*/
hexley	0:281d6ff68967	210	static void
hexley	0:281d6ff68967	211	dhcp_check(struct netif *netif)
hexley	0:281d6ff68967	212	{
hexley	0:281d6ff68967	213	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	214	err_t result;
hexley	0:281d6ff68967	215	u16_t msecs;
hexley	0:281d6ff68967	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
hexley	0:281d6ff68967	217	(s16_t)netif->name[1]));
hexley	0:281d6ff68967	218	dhcp_set_state(dhcp, DHCP_CHECKING);
hexley	0:281d6ff68967	219	/* create an ARP query for the offered IP address, expecting that no host
hexley	0:281d6ff68967	220	responds, as the IP address should not be in use. */
hexley	0:281d6ff68967	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
hexley	0:281d6ff68967	222	if (result != ERR_OK) {
hexley	0:281d6ff68967	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
hexley	0:281d6ff68967	224	}
hexley	0:281d6ff68967	225	dhcp->tries++;
hexley	0:281d6ff68967	226	msecs = 500;
hexley	0:281d6ff68967	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	229	}
hexley	0:281d6ff68967	230	#endif /* DHCP_DOES_ARP_CHECK */
hexley	0:281d6ff68967	231
hexley	0:281d6ff68967	232	/**
hexley	0:281d6ff68967	233	* Remember the configuration offered by a DHCP server.
hexley	0:281d6ff68967	234	*
hexley	0:281d6ff68967	235	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	236	*/
hexley	0:281d6ff68967	237	static void
hexley	0:281d6ff68967	238	dhcp_handle_offer(struct netif *netif)
hexley	0:281d6ff68967	239	{
hexley	0:281d6ff68967	240	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
hexley	0:281d6ff68967	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
hexley	0:281d6ff68967	243	/* obtain the server address */
hexley	0:281d6ff68967	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
hexley	0:281d6ff68967	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
hexley	0:281d6ff68967	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
hexley	0:281d6ff68967	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
hexley	0:281d6ff68967	248	/* remember offered address */
hexley	0:281d6ff68967	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
hexley	0:281d6ff68967	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
hexley	0:281d6ff68967	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
hexley	0:281d6ff68967	252
hexley	0:281d6ff68967	253	dhcp_select(netif);
hexley	0:281d6ff68967	254	} else {
hexley	0:281d6ff68967	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
hexley	0:281d6ff68967	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
hexley	0:281d6ff68967	257	}
hexley	0:281d6ff68967	258	}
hexley	0:281d6ff68967	259
hexley	0:281d6ff68967	260	/**
hexley	0:281d6ff68967	261	* Select a DHCP server offer out of all offers.
hexley	0:281d6ff68967	262	*
hexley	0:281d6ff68967	263	* Simply select the first offer received.
hexley	0:281d6ff68967	264	*
hexley	0:281d6ff68967	265	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	266	* @return lwIP specific error (see error.h)
hexley	0:281d6ff68967	267	*/
hexley	0:281d6ff68967	268	static err_t
hexley	0:281d6ff68967	269	dhcp_select(struct netif *netif)
hexley	0:281d6ff68967	270	{
hexley	0:281d6ff68967	271	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	272	err_t result;
hexley	0:281d6ff68967	273	u16_t msecs;
hexley	0:281d6ff68967	274
hexley	0:281d6ff68967	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));
hexley	0:281d6ff68967	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
hexley	0:281d6ff68967	277
hexley	0:281d6ff68967	278	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
hexley	0:281d6ff68967	280	if (result == ERR_OK) {
hexley	0:281d6ff68967	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
hexley	0:281d6ff68967	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
hexley	0:281d6ff68967	283
hexley	0:281d6ff68967	284	/* MUST request the offered IP address */
hexley	0:281d6ff68967	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
hexley	0:281d6ff68967	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
hexley	0:281d6ff68967	287
hexley	0:281d6ff68967	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
hexley	0:281d6ff68967	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
hexley	0:281d6ff68967	290
hexley	0:281d6ff68967	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
hexley	0:281d6ff68967	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
hexley	0:281d6ff68967	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
hexley	0:281d6ff68967	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
hexley	0:281d6ff68967	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
hexley	0:281d6ff68967	296
hexley	0:281d6ff68967	297	#if LWIP_NETIF_HOSTNAME
hexley	0:281d6ff68967	298	if (netif->hostname != NULL) {
hexley	0:281d6ff68967	299	const char p = (const char)netif->hostname;
hexley	0:281d6ff68967	300	u8_t namelen = (u8_t)strlen(p);
hexley	0:281d6ff68967	301	if (namelen > 0) {
hexley	0:281d6ff68967	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
hexley	0:281d6ff68967	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
hexley	0:281d6ff68967	304	while (*p) {
hexley	0:281d6ff68967	305	dhcp_option_byte(dhcp, *p++);
hexley	0:281d6ff68967	306	}
hexley	0:281d6ff68967	307	}
hexley	0:281d6ff68967	308	}
hexley	0:281d6ff68967	309	#endif /* LWIP_NETIF_HOSTNAME */
hexley	0:281d6ff68967	310
hexley	0:281d6ff68967	311	dhcp_option_trailer(dhcp);
hexley	0:281d6ff68967	312	/* shrink the pbuf to the actual content length */
hexley	0:281d6ff68967	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
hexley	0:281d6ff68967	314
hexley	0:281d6ff68967	315	/* send broadcast to any DHCP server */
hexley	0:281d6ff68967	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	317	dhcp_delete_msg(dhcp);
hexley	0:281d6ff68967	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
hexley	0:281d6ff68967	319	} else {
hexley	0:281d6ff68967	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	321	}
hexley	0:281d6ff68967	322	dhcp->tries++;
hexley	0:281d6ff68967	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
hexley	0:281d6ff68967	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	326	return result;
hexley	0:281d6ff68967	327	}
hexley	0:281d6ff68967	328
hexley	0:281d6ff68967	329	/**
hexley	0:281d6ff68967	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
hexley	0:281d6ff68967	331	*/
hexley	0:281d6ff68967	332	void
hexley	0:281d6ff68967	333	dhcp_coarse_tmr()
hexley	0:281d6ff68967	334	{
hexley	0:281d6ff68967	335	struct netif *netif = netif_list;
hexley	0:281d6ff68967	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
hexley	0:281d6ff68967	337	/* iterate through all network interfaces */
hexley	0:281d6ff68967	338	while (netif != NULL) {
hexley	0:281d6ff68967	339	/* only act on DHCP configured interfaces */
hexley	0:281d6ff68967	340	if (netif->dhcp != NULL) {
hexley	0:281d6ff68967	341	/* timer is active (non zero), and triggers (zeroes) now? */
hexley	0:281d6ff68967	342	if (netif->dhcp->t2_timeout-- == 1) {
hexley	0:281d6ff68967	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
hexley	0:281d6ff68967	344	/* this clients' rebind timeout triggered */
hexley	0:281d6ff68967	345	dhcp_t2_timeout(netif);
hexley	0:281d6ff68967	346	/* timer is active (non zero), and triggers (zeroes) now */
hexley	0:281d6ff68967	347	} else if (netif->dhcp->t1_timeout-- == 1) {
hexley	0:281d6ff68967	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
hexley	0:281d6ff68967	349	/* this clients' renewal timeout triggered */
hexley	0:281d6ff68967	350	dhcp_t1_timeout(netif);
hexley	0:281d6ff68967	351	}
hexley	0:281d6ff68967	352	}
hexley	0:281d6ff68967	353	/* proceed to next netif */
hexley	0:281d6ff68967	354	netif = netif->next;
hexley	0:281d6ff68967	355	}
hexley	0:281d6ff68967	356	}
hexley	0:281d6ff68967	357
hexley	0:281d6ff68967	358	/**
hexley	0:281d6ff68967	359	* DHCP transaction timeout handling
hexley	0:281d6ff68967	360	*
hexley	0:281d6ff68967	361	* A DHCP server is expected to respond within a short period of time.
hexley	0:281d6ff68967	362	* This timer checks whether an outstanding DHCP request is timed out.
hexley	0:281d6ff68967	363	*/
hexley	0:281d6ff68967	364	void
hexley	0:281d6ff68967	365	dhcp_fine_tmr()
hexley	0:281d6ff68967	366	{
hexley	0:281d6ff68967	367	struct netif *netif = netif_list;
hexley	0:281d6ff68967	368	/* loop through netif's */
hexley	0:281d6ff68967	369	while (netif != NULL) {
hexley	0:281d6ff68967	370	/* only act on DHCP configured interfaces */
hexley	0:281d6ff68967	371	if (netif->dhcp != NULL) {
hexley	0:281d6ff68967	372	/* timer is active (non zero), and is about to trigger now */
hexley	0:281d6ff68967	373	if (netif->dhcp->request_timeout > 1) {
hexley	0:281d6ff68967	374	netif->dhcp->request_timeout--;
hexley	0:281d6ff68967	375	}
hexley	0:281d6ff68967	376	else if (netif->dhcp->request_timeout == 1) {
hexley	0:281d6ff68967	377	netif->dhcp->request_timeout--;
hexley	0:281d6ff68967	378	/* { netif->dhcp->request_timeout == 0 } */
hexley	0:281d6ff68967	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
hexley	0:281d6ff68967	380	/* this client's request timeout triggered */
hexley	0:281d6ff68967	381	dhcp_timeout(netif);
hexley	0:281d6ff68967	382	}
hexley	0:281d6ff68967	383	}
hexley	0:281d6ff68967	384	/* proceed to next network interface */
hexley	0:281d6ff68967	385	netif = netif->next;
hexley	0:281d6ff68967	386	}
hexley	0:281d6ff68967	387	}
hexley	0:281d6ff68967	388
hexley	0:281d6ff68967	389	/**
hexley	0:281d6ff68967	390	* A DHCP negotiation transaction, or ARP request, has timed out.
hexley	0:281d6ff68967	391	*
hexley	0:281d6ff68967	392	* The timer that was started with the DHCP or ARP request has
hexley	0:281d6ff68967	393	* timed out, indicating no response was received in time.
hexley	0:281d6ff68967	394	*
hexley	0:281d6ff68967	395	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	396	*/
hexley	0:281d6ff68967	397	static void
hexley	0:281d6ff68967	398	dhcp_timeout(struct netif *netif)
hexley	0:281d6ff68967	399	{
hexley	0:281d6ff68967	400	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
hexley	0:281d6ff68967	402	/* back-off period has passed, or server selection timed out */
hexley	0:281d6ff68967	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
hexley	0:281d6ff68967	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
hexley	0:281d6ff68967	405	dhcp_discover(netif);
hexley	0:281d6ff68967	406	/* receiving the requested lease timed out */
hexley	0:281d6ff68967	407	} else if (dhcp->state == DHCP_REQUESTING) {
hexley	0:281d6ff68967	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
hexley	0:281d6ff68967	409	if (dhcp->tries <= 5) {
hexley	0:281d6ff68967	410	dhcp_select(netif);
hexley	0:281d6ff68967	411	} else {
hexley	0:281d6ff68967	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
hexley	0:281d6ff68967	413	dhcp_release(netif);
hexley	0:281d6ff68967	414	dhcp_discover(netif);
hexley	0:281d6ff68967	415	}
hexley	0:281d6ff68967	416	#if DHCP_DOES_ARP_CHECK
hexley	0:281d6ff68967	417	/* received no ARP reply for the offered address (which is good) */
hexley	0:281d6ff68967	418	} else if (dhcp->state == DHCP_CHECKING) {
hexley	0:281d6ff68967	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
hexley	0:281d6ff68967	420	if (dhcp->tries <= 1) {
hexley	0:281d6ff68967	421	dhcp_check(netif);
hexley	0:281d6ff68967	422	/* no ARP replies on the offered address,
hexley	0:281d6ff68967	423	looks like the IP address is indeed free */
hexley	0:281d6ff68967	424	} else {
hexley	0:281d6ff68967	425	/* bind the interface to the offered address */
hexley	0:281d6ff68967	426	dhcp_bind(netif);
hexley	0:281d6ff68967	427	}
hexley	0:281d6ff68967	428	#endif /* DHCP_DOES_ARP_CHECK */
hexley	0:281d6ff68967	429	}
hexley	0:281d6ff68967	430	/* did not get response to renew request? */
hexley	0:281d6ff68967	431	else if (dhcp->state == DHCP_RENEWING) {
hexley	0:281d6ff68967	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
hexley	0:281d6ff68967	433	/* just retry renewal */
hexley	0:281d6ff68967	434	/* note that the rebind timer will eventually time-out if renew does not work */
hexley	0:281d6ff68967	435	dhcp_renew(netif);
hexley	0:281d6ff68967	436	/* did not get response to rebind request? */
hexley	0:281d6ff68967	437	} else if (dhcp->state == DHCP_REBINDING) {
hexley	0:281d6ff68967	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
hexley	0:281d6ff68967	439	if (dhcp->tries <= 8) {
hexley	0:281d6ff68967	440	dhcp_rebind(netif);
hexley	0:281d6ff68967	441	} else {
hexley	0:281d6ff68967	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
hexley	0:281d6ff68967	443	dhcp_release(netif);
hexley	0:281d6ff68967	444	dhcp_discover(netif);
hexley	0:281d6ff68967	445	}
hexley	0:281d6ff68967	446	} else if (dhcp->state == DHCP_REBOOTING) {
hexley	0:281d6ff68967	447	if (dhcp->tries < REBOOT_TRIES) {
hexley	0:281d6ff68967	448	dhcp_reboot(netif);
hexley	0:281d6ff68967	449	} else {
hexley	0:281d6ff68967	450	dhcp_discover(netif);
hexley	0:281d6ff68967	451	}
hexley	0:281d6ff68967	452	}
hexley	0:281d6ff68967	453	}
hexley	0:281d6ff68967	454
hexley	0:281d6ff68967	455	/**
hexley	0:281d6ff68967	456	* The renewal period has timed out.
hexley	0:281d6ff68967	457	*
hexley	0:281d6ff68967	458	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	459	*/
hexley	0:281d6ff68967	460	static void
hexley	0:281d6ff68967	461	dhcp_t1_timeout(struct netif *netif)
hexley	0:281d6ff68967	462	{
hexley	0:281d6ff68967	463	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
hexley	0:281d6ff68967	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
hexley	0:281d6ff68967	466	(dhcp->state == DHCP_RENEWING)) {
hexley	0:281d6ff68967	467	/* just retry to renew - note that the rebind timer (t2) will
hexley	0:281d6ff68967	468	* eventually time-out if renew tries fail. */
hexley	0:281d6ff68967	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
hexley	0:281d6ff68967	470	("dhcp_t1_timeout(): must renew\n"));
hexley	0:281d6ff68967	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
hexley	0:281d6ff68967	472	DHCP_RENEWING, not DHCP_BOUND */
hexley	0:281d6ff68967	473	dhcp_renew(netif);
hexley	0:281d6ff68967	474	}
hexley	0:281d6ff68967	475	}
hexley	0:281d6ff68967	476
hexley	0:281d6ff68967	477	/**
hexley	0:281d6ff68967	478	* The rebind period has timed out.
hexley	0:281d6ff68967	479	*
hexley	0:281d6ff68967	480	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	481	*/
hexley	0:281d6ff68967	482	static void
hexley	0:281d6ff68967	483	dhcp_t2_timeout(struct netif *netif)
hexley	0:281d6ff68967	484	{
hexley	0:281d6ff68967	485	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
hexley	0:281d6ff68967	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
hexley	0:281d6ff68967	488	(dhcp->state == DHCP_RENEWING)) {
hexley	0:281d6ff68967	489	/* just retry to rebind */
hexley	0:281d6ff68967	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
hexley	0:281d6ff68967	491	("dhcp_t2_timeout(): must rebind\n"));
hexley	0:281d6ff68967	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
hexley	0:281d6ff68967	493	DHCP_REBINDING, not DHCP_BOUND */
hexley	0:281d6ff68967	494	dhcp_rebind(netif);
hexley	0:281d6ff68967	495	}
hexley	0:281d6ff68967	496	}
hexley	0:281d6ff68967	497
hexley	0:281d6ff68967	498	/**
hexley	0:281d6ff68967	499	* Handle a DHCP ACK packet
hexley	0:281d6ff68967	500	*
hexley	0:281d6ff68967	501	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	502	*/
hexley	0:281d6ff68967	503	static void
hexley	0:281d6ff68967	504	dhcp_handle_ack(struct netif *netif)
hexley	0:281d6ff68967	505	{
hexley	0:281d6ff68967	506	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	507	#if LWIP_DNS
hexley	0:281d6ff68967	508	u8_t n;
hexley	0:281d6ff68967	509	#endif /* LWIP_DNS */
hexley	0:281d6ff68967	510
hexley	0:281d6ff68967	511	/* clear options we might not get from the ACK */
hexley	0:281d6ff68967	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
hexley	0:281d6ff68967	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
hexley	0:281d6ff68967	514	#if LWIP_DHCP_BOOTP_FILE
hexley	0:281d6ff68967	515	ip_addr_set_zero(&dhcp->offered_si_addr);
hexley	0:281d6ff68967	516	#endif /* LWIP_DHCP_BOOTP_FILE */
hexley	0:281d6ff68967	517
hexley	0:281d6ff68967	518	/* lease time given? */
hexley	0:281d6ff68967	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
hexley	0:281d6ff68967	520	/* remember offered lease time */
hexley	0:281d6ff68967	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
hexley	0:281d6ff68967	522	}
hexley	0:281d6ff68967	523	/* renewal period given? */
hexley	0:281d6ff68967	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
hexley	0:281d6ff68967	525	/* remember given renewal period */
hexley	0:281d6ff68967	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
hexley	0:281d6ff68967	527	} else {
hexley	0:281d6ff68967	528	/* calculate safe periods for renewal */
hexley	0:281d6ff68967	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
hexley	0:281d6ff68967	530	}
hexley	0:281d6ff68967	531
hexley	0:281d6ff68967	532	/* renewal period given? */
hexley	0:281d6ff68967	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
hexley	0:281d6ff68967	534	/* remember given rebind period */
hexley	0:281d6ff68967	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
hexley	0:281d6ff68967	536	} else {
hexley	0:281d6ff68967	537	/* calculate safe periods for rebinding */
hexley	0:281d6ff68967	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
hexley	0:281d6ff68967	539	}
hexley	0:281d6ff68967	540
hexley	0:281d6ff68967	541	/* (y)our internet address */
hexley	0:281d6ff68967	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
hexley	0:281d6ff68967	543
hexley	0:281d6ff68967	544	#if LWIP_DHCP_BOOTP_FILE
hexley	0:281d6ff68967	545	/* copy boot server address,
hexley	0:281d6ff68967	546	boot file name copied in dhcp_parse_reply if not overloaded */
hexley	0:281d6ff68967	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
hexley	0:281d6ff68967	548	#endif /* LWIP_DHCP_BOOTP_FILE */
hexley	0:281d6ff68967	549
hexley	0:281d6ff68967	550	/* subnet mask given? */
hexley	0:281d6ff68967	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
hexley	0:281d6ff68967	552	/* remember given subnet mask */
hexley	0:281d6ff68967	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
hexley	0:281d6ff68967	554	dhcp->subnet_mask_given = 1;
hexley	0:281d6ff68967	555	} else {
hexley	0:281d6ff68967	556	dhcp->subnet_mask_given = 0;
hexley	0:281d6ff68967	557	}
hexley	0:281d6ff68967	558
hexley	0:281d6ff68967	559	/* gateway router */
hexley	0:281d6ff68967	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
hexley	0:281d6ff68967	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
hexley	0:281d6ff68967	562	}
hexley	0:281d6ff68967	563
hexley	0:281d6ff68967	564	#if LWIP_DNS
hexley	0:281d6ff68967	565	/* DNS servers */
hexley	0:281d6ff68967	566	n = 0;
hexley	0:281d6ff68967	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
hexley	0:281d6ff68967	568	ip_addr_t dns_addr;
hexley	0:281d6ff68967	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
hexley	0:281d6ff68967	570	dns_setserver(n, &dns_addr);
hexley	0:281d6ff68967	571	n++;
hexley	0:281d6ff68967	572	}
hexley	0:281d6ff68967	573	#endif /* LWIP_DNS */
hexley	0:281d6ff68967	574	}
hexley	0:281d6ff68967	575
hexley	0:281d6ff68967	576	/** Set a statically allocated struct dhcp to work with.
hexley	0:281d6ff68967	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
hexley	0:281d6ff68967	578	*
hexley	0:281d6ff68967	579	* @param netif the netif for which to set the struct dhcp
hexley	0:281d6ff68967	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
hexley	0:281d6ff68967	581	*/
hexley	0:281d6ff68967	582	void
hexley	0:281d6ff68967	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
hexley	0:281d6ff68967	584	{
hexley	0:281d6ff68967	585	LWIP_ASSERT("netif != NULL", netif != NULL);
hexley	0:281d6ff68967	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
hexley	0:281d6ff68967	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
hexley	0:281d6ff68967	588
hexley	0:281d6ff68967	589	/* clear data structure */
hexley	0:281d6ff68967	590	memset(dhcp, 0, sizeof(struct dhcp));
hexley	0:281d6ff68967	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
hexley	0:281d6ff68967	592	netif->dhcp = dhcp;
hexley	0:281d6ff68967	593	}
hexley	0:281d6ff68967	594
hexley	0:281d6ff68967	595	/**
hexley	0:281d6ff68967	596	* Start DHCP negotiation for a network interface.
hexley	0:281d6ff68967	597	*
hexley	0:281d6ff68967	598	* If no DHCP client instance was attached to this interface,
hexley	0:281d6ff68967	599	* a new client is created first. If a DHCP client instance
hexley	0:281d6ff68967	600	* was already present, it restarts negotiation.
hexley	0:281d6ff68967	601	*
hexley	0:281d6ff68967	602	* @param netif The lwIP network interface
hexley	0:281d6ff68967	603	* @return lwIP error code
hexley	0:281d6ff68967	604	* - ERR_OK - No error
hexley	0:281d6ff68967	605	* - ERR_MEM - Out of memory
hexley	0:281d6ff68967	606	*/
hexley	0:281d6ff68967	607	err_t
hexley	0:281d6ff68967	608	dhcp_start(struct netif *netif)
hexley	0:281d6ff68967	609	{
hexley	0:281d6ff68967	610	struct dhcp *dhcp;
hexley	0:281d6ff68967	611	err_t result = ERR_OK;
hexley	0:281d6ff68967	612
hexley	0:281d6ff68967	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
hexley	0:281d6ff68967	614	dhcp = netif->dhcp;
hexley	0:281d6ff68967	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));
hexley	0:281d6ff68967	616	/* Remove the flag that says this netif is handled by DHCP,
hexley	0:281d6ff68967	617	it is set when we succeeded starting. */
hexley	0:281d6ff68967	618	netif->flags &= ~NETIF_FLAG_DHCP;
hexley	0:281d6ff68967	619
hexley	0:281d6ff68967	620	/* check hwtype of the netif */
hexley	0:281d6ff68967	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
hexley	0:281d6ff68967	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
hexley	0:281d6ff68967	623	return ERR_ARG;
hexley	0:281d6ff68967	624	}
hexley	0:281d6ff68967	625
hexley	0:281d6ff68967	626	/* check MTU of the netif */
hexley	0:281d6ff68967	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
hexley	0:281d6ff68967	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
hexley	0:281d6ff68967	629	return ERR_MEM;
hexley	0:281d6ff68967	630	}
hexley	0:281d6ff68967	631
hexley	0:281d6ff68967	632	/* no DHCP client attached yet? */
hexley	0:281d6ff68967	633	if (dhcp == NULL) {
hexley	0:281d6ff68967	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
hexley	0:281d6ff68967	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
hexley	0:281d6ff68967	636	if (dhcp == NULL) {
hexley	0:281d6ff68967	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
hexley	0:281d6ff68967	638	return ERR_MEM;
hexley	0:281d6ff68967	639	}
hexley	0:281d6ff68967	640	/* store this dhcp client in the netif */
hexley	0:281d6ff68967	641	netif->dhcp = dhcp;
hexley	0:281d6ff68967	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
hexley	0:281d6ff68967	643	/* already has DHCP client attached */
hexley	0:281d6ff68967	644	} else {
hexley	0:281d6ff68967	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
hexley	0:281d6ff68967	646	if (dhcp->pcb != NULL) {
hexley	0:281d6ff68967	647	udp_remove(dhcp->pcb);
hexley	0:281d6ff68967	648	}
hexley	0:281d6ff68967	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
hexley	0:281d6ff68967	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
hexley	0:281d6ff68967	651	}
hexley	0:281d6ff68967	652
hexley	0:281d6ff68967	653	/* clear data structure */
hexley	0:281d6ff68967	654	memset(dhcp, 0, sizeof(struct dhcp));
hexley	0:281d6ff68967	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
hexley	0:281d6ff68967	656	/* allocate UDP PCB */
hexley	0:281d6ff68967	657	dhcp->pcb = udp_new();
hexley	0:281d6ff68967	658	if (dhcp->pcb == NULL) {
hexley	0:281d6ff68967	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
hexley	0:281d6ff68967	660	return ERR_MEM;
hexley	0:281d6ff68967	661	}
hexley	0:281d6ff68967	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
hexley	0:281d6ff68967	663	/* set up local and remote port for the pcb */
hexley	0:281d6ff68967	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
hexley	0:281d6ff68967	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
hexley	0:281d6ff68967	666	/* set up the recv callback and argument */
hexley	0:281d6ff68967	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
hexley	0:281d6ff68967	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
hexley	0:281d6ff68967	669	/* (re)start the DHCP negotiation */
hexley	0:281d6ff68967	670	result = dhcp_discover(netif);
hexley	0:281d6ff68967	671	if (result != ERR_OK) {
hexley	0:281d6ff68967	672	/* free resources allocated above */
hexley	0:281d6ff68967	673	dhcp_stop(netif);
hexley	0:281d6ff68967	674	return ERR_MEM;
hexley	0:281d6ff68967	675	}
hexley	0:281d6ff68967	676	/* Set the flag that says this netif is handled by DHCP. */
hexley	0:281d6ff68967	677	netif->flags \|= NETIF_FLAG_DHCP;
hexley	0:281d6ff68967	678	return result;
hexley	0:281d6ff68967	679	}
hexley	0:281d6ff68967	680
hexley	0:281d6ff68967	681	/**
hexley	0:281d6ff68967	682	* Inform a DHCP server of our manual configuration.
hexley	0:281d6ff68967	683	*
hexley	0:281d6ff68967	684	* This informs DHCP servers of our fixed IP address configuration
hexley	0:281d6ff68967	685	* by sending an INFORM message. It does not involve DHCP address
hexley	0:281d6ff68967	686	* configuration, it is just here to be nice to the network.
hexley	0:281d6ff68967	687	*
hexley	0:281d6ff68967	688	* @param netif The lwIP network interface
hexley	0:281d6ff68967	689	*/
hexley	0:281d6ff68967	690	void
hexley	0:281d6ff68967	691	dhcp_inform(struct netif *netif)
hexley	0:281d6ff68967	692	{
hexley	0:281d6ff68967	693	struct dhcp dhcp;
hexley	0:281d6ff68967	694	err_t result = ERR_OK;
hexley	0:281d6ff68967	695	struct udp_pcb *pcb;
hexley	0:281d6ff68967	696
hexley	0:281d6ff68967	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
hexley	0:281d6ff68967	698
hexley	0:281d6ff68967	699	memset(&dhcp, 0, sizeof(struct dhcp));
hexley	0:281d6ff68967	700	dhcp_set_state(&dhcp, DHCP_INFORM);
hexley	0:281d6ff68967	701
hexley	0:281d6ff68967	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
hexley	0:281d6ff68967	703	/* re-use existing pcb */
hexley	0:281d6ff68967	704	pcb = netif->dhcp->pcb;
hexley	0:281d6ff68967	705	} else {
hexley	0:281d6ff68967	706	pcb = udp_new();
hexley	0:281d6ff68967	707	if (pcb == NULL) {
hexley	0:281d6ff68967	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
hexley	0:281d6ff68967	709	return;
hexley	0:281d6ff68967	710	}
hexley	0:281d6ff68967	711	dhcp.pcb = pcb;
hexley	0:281d6ff68967	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
hexley	0:281d6ff68967	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
hexley	0:281d6ff68967	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
hexley	0:281d6ff68967	715	}
hexley	0:281d6ff68967	716	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
hexley	0:281d6ff68967	718	if (result == ERR_OK) {
hexley	0:281d6ff68967	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
hexley	0:281d6ff68967	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
hexley	0:281d6ff68967	721
hexley	0:281d6ff68967	722	dhcp_option_trailer(&dhcp);
hexley	0:281d6ff68967	723
hexley	0:281d6ff68967	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
hexley	0:281d6ff68967	725
hexley	0:281d6ff68967	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
hexley	0:281d6ff68967	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	728	dhcp_delete_msg(&dhcp);
hexley	0:281d6ff68967	729	} else {
hexley	0:281d6ff68967	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	731	}
hexley	0:281d6ff68967	732
hexley	0:281d6ff68967	733	if (dhcp.pcb != NULL) {
hexley	0:281d6ff68967	734	/* otherwise, the existing pcb was used */
hexley	0:281d6ff68967	735	udp_remove(dhcp.pcb);
hexley	0:281d6ff68967	736	}
hexley	0:281d6ff68967	737	}
hexley	0:281d6ff68967	738
hexley	0:281d6ff68967	739	/** Handle a possible change in the network configuration.
hexley	0:281d6ff68967	740	*
hexley	0:281d6ff68967	741	* This enters the REBOOTING state to verify that the currently bound
hexley	0:281d6ff68967	742	* address is still valid.
hexley	0:281d6ff68967	743	*/
hexley	0:281d6ff68967	744	void
hexley	0:281d6ff68967	745	dhcp_network_changed(struct netif *netif)
hexley	0:281d6ff68967	746	{
hexley	0:281d6ff68967	747	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	748	if (!dhcp)
hexley	0:281d6ff68967	749	return;
hexley	0:281d6ff68967	750	switch (dhcp->state) {
hexley	0:281d6ff68967	751	case DHCP_REBINDING:
hexley	0:281d6ff68967	752	case DHCP_RENEWING:
hexley	0:281d6ff68967	753	case DHCP_BOUND:
hexley	0:281d6ff68967	754	case DHCP_REBOOTING:
hexley	0:281d6ff68967	755	netif_set_down(netif);
hexley	0:281d6ff68967	756	dhcp->tries = 0;
hexley	0:281d6ff68967	757	dhcp_reboot(netif);
hexley	0:281d6ff68967	758	break;
hexley	0:281d6ff68967	759	case DHCP_OFF:
hexley	0:281d6ff68967	760	/* stay off */
hexley	0:281d6ff68967	761	break;
hexley	0:281d6ff68967	762	default:
hexley	0:281d6ff68967	763	dhcp->tries = 0;
hexley	0:281d6ff68967	764	#if LWIP_DHCP_AUTOIP_COOP
hexley	0:281d6ff68967	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
hexley	0:281d6ff68967	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
hexley	0:281d6ff68967	767	dhcp_discover(netif);
hexley	0:281d6ff68967	768	break;
hexley	0:281d6ff68967	769	}
hexley	0:281d6ff68967	770	}
hexley	0:281d6ff68967	771
hexley	0:281d6ff68967	772	#if DHCP_DOES_ARP_CHECK
hexley	0:281d6ff68967	773	/**
hexley	0:281d6ff68967	774	* Match an ARP reply with the offered IP address.
hexley	0:281d6ff68967	775	*
hexley	0:281d6ff68967	776	* @param netif the network interface on which the reply was received
hexley	0:281d6ff68967	777	* @param addr The IP address we received a reply from
hexley	0:281d6ff68967	778	*/
hexley	0:281d6ff68967	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
hexley	0:281d6ff68967	780	{
hexley	0:281d6ff68967	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
hexley	0:281d6ff68967	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
hexley	0:281d6ff68967	783	/* is a DHCP client doing an ARP check? */
hexley	0:281d6ff68967	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
hexley	0:281d6ff68967	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
hexley	0:281d6ff68967	786	ip4_addr_get_u32(addr)));
hexley	0:281d6ff68967	787	/* did a host respond with the address we
hexley	0:281d6ff68967	788	were offered by the DHCP server? */
hexley	0:281d6ff68967	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
hexley	0:281d6ff68967	790	/* we will not accept the offered address */
hexley	0:281d6ff68967	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
hexley	0:281d6ff68967	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
hexley	0:281d6ff68967	793	dhcp_decline(netif);
hexley	0:281d6ff68967	794	}
hexley	0:281d6ff68967	795	}
hexley	0:281d6ff68967	796	}
hexley	0:281d6ff68967	797
hexley	0:281d6ff68967	798	/**
hexley	0:281d6ff68967	799	* Decline an offered lease.
hexley	0:281d6ff68967	800	*
hexley	0:281d6ff68967	801	* Tell the DHCP server we do not accept the offered address.
hexley	0:281d6ff68967	802	* One reason to decline the lease is when we find out the address
hexley	0:281d6ff68967	803	* is already in use by another host (through ARP).
hexley	0:281d6ff68967	804	*
hexley	0:281d6ff68967	805	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	806	*/
hexley	0:281d6ff68967	807	static err_t
hexley	0:281d6ff68967	808	dhcp_decline(struct netif *netif)
hexley	0:281d6ff68967	809	{
hexley	0:281d6ff68967	810	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	811	err_t result = ERR_OK;
hexley	0:281d6ff68967	812	u16_t msecs;
hexley	0:281d6ff68967	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
hexley	0:281d6ff68967	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
hexley	0:281d6ff68967	815	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
hexley	0:281d6ff68967	817	if (result == ERR_OK) {
hexley	0:281d6ff68967	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
hexley	0:281d6ff68967	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
hexley	0:281d6ff68967	820
hexley	0:281d6ff68967	821	dhcp_option_trailer(dhcp);
hexley	0:281d6ff68967	822	/* resize pbuf to reflect true size of options */
hexley	0:281d6ff68967	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
hexley	0:281d6ff68967	824
hexley	0:281d6ff68967	825	/* per section 4.4.4, broadcast DECLINE messages */
hexley	0:281d6ff68967	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	827	dhcp_delete_msg(dhcp);
hexley	0:281d6ff68967	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
hexley	0:281d6ff68967	829	} else {
hexley	0:281d6ff68967	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
hexley	0:281d6ff68967	831	("dhcp_decline: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	832	}
hexley	0:281d6ff68967	833	dhcp->tries++;
hexley	0:281d6ff68967	834	msecs = 10*1000;
hexley	0:281d6ff68967	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	837	return result;
hexley	0:281d6ff68967	838	}
hexley	0:281d6ff68967	839	#endif /* DHCP_DOES_ARP_CHECK */
hexley	0:281d6ff68967	840
hexley	0:281d6ff68967	841
hexley	0:281d6ff68967	842	/**
hexley	0:281d6ff68967	843	* Start the DHCP process, discover a DHCP server.
hexley	0:281d6ff68967	844	*
hexley	0:281d6ff68967	845	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	846	*/
hexley	0:281d6ff68967	847	static err_t
hexley	0:281d6ff68967	848	dhcp_discover(struct netif *netif)
hexley	0:281d6ff68967	849	{
hexley	0:281d6ff68967	850	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	851	err_t result = ERR_OK;
hexley	0:281d6ff68967	852	u16_t msecs;
hexley	0:281d6ff68967	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
hexley	0:281d6ff68967	854	ip_addr_set_any(&dhcp->offered_ip_addr);
hexley	0:281d6ff68967	855	dhcp_set_state(dhcp, DHCP_SELECTING);
hexley	0:281d6ff68967	856	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
hexley	0:281d6ff68967	858	if (result == ERR_OK) {
hexley	0:281d6ff68967	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
hexley	0:281d6ff68967	860
hexley	0:281d6ff68967	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
hexley	0:281d6ff68967	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
hexley	0:281d6ff68967	863
hexley	0:281d6ff68967	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
hexley	0:281d6ff68967	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
hexley	0:281d6ff68967	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
hexley	0:281d6ff68967	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
hexley	0:281d6ff68967	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
hexley	0:281d6ff68967	869
hexley	0:281d6ff68967	870	dhcp_option_trailer(dhcp);
hexley	0:281d6ff68967	871
hexley	0:281d6ff68967	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
hexley	0:281d6ff68967	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
hexley	0:281d6ff68967	874
hexley	0:281d6ff68967	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
hexley	0:281d6ff68967	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
hexley	0:281d6ff68967	878	dhcp_delete_msg(dhcp);
hexley	0:281d6ff68967	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
hexley	0:281d6ff68967	880	} else {
hexley	0:281d6ff68967	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	882	}
hexley	0:281d6ff68967	883	dhcp->tries++;
hexley	0:281d6ff68967	884	#if LWIP_DHCP_AUTOIP_COOP
hexley	0:281d6ff68967	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
hexley	0:281d6ff68967	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
hexley	0:281d6ff68967	887	autoip_start(netif);
hexley	0:281d6ff68967	888	}
hexley	0:281d6ff68967	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
hexley	0:281d6ff68967	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
hexley	0:281d6ff68967	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	893	return result;
hexley	0:281d6ff68967	894	}
hexley	0:281d6ff68967	895
hexley	0:281d6ff68967	896
hexley	0:281d6ff68967	897	/**
hexley	0:281d6ff68967	898	* Bind the interface to the offered IP address.
hexley	0:281d6ff68967	899	*
hexley	0:281d6ff68967	900	* @param netif network interface to bind to the offered address
hexley	0:281d6ff68967	901	*/
hexley	0:281d6ff68967	902	static void
hexley	0:281d6ff68967	903	dhcp_bind(struct netif *netif)
hexley	0:281d6ff68967	904	{
hexley	0:281d6ff68967	905	u32_t timeout;
hexley	0:281d6ff68967	906	struct dhcp *dhcp;
hexley	0:281d6ff68967	907	ip_addr_t sn_mask, gw_addr;
hexley	0:281d6ff68967	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
hexley	0:281d6ff68967	909	dhcp = netif->dhcp;
hexley	0:281d6ff68967	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
hexley	0:281d6ff68967	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));
hexley	0:281d6ff68967	912
hexley	0:281d6ff68967	913	/* temporary DHCP lease? */
hexley	0:281d6ff68967	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
hexley	0:281d6ff68967	915	/* set renewal period timer */
hexley	0:281d6ff68967	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
hexley	0:281d6ff68967	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
hexley	0:281d6ff68967	918	if(timeout > 0xffff) {
hexley	0:281d6ff68967	919	timeout = 0xffff;
hexley	0:281d6ff68967	920	}
hexley	0:281d6ff68967	921	dhcp->t1_timeout = (u16_t)timeout;
hexley	0:281d6ff68967	922	if (dhcp->t1_timeout == 0) {
hexley	0:281d6ff68967	923	dhcp->t1_timeout = 1;
hexley	0:281d6ff68967	924	}
hexley	0:281d6ff68967	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));
hexley	0:281d6ff68967	926	}
hexley	0:281d6ff68967	927	/* set renewal period timer */
hexley	0:281d6ff68967	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
hexley	0:281d6ff68967	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
hexley	0:281d6ff68967	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
hexley	0:281d6ff68967	931	if(timeout > 0xffff) {
hexley	0:281d6ff68967	932	timeout = 0xffff;
hexley	0:281d6ff68967	933	}
hexley	0:281d6ff68967	934	dhcp->t2_timeout = (u16_t)timeout;
hexley	0:281d6ff68967	935	if (dhcp->t2_timeout == 0) {
hexley	0:281d6ff68967	936	dhcp->t2_timeout = 1;
hexley	0:281d6ff68967	937	}
hexley	0:281d6ff68967	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));
hexley	0:281d6ff68967	939	}
hexley	0:281d6ff68967	940
hexley	0:281d6ff68967	941	if (dhcp->subnet_mask_given) {
hexley	0:281d6ff68967	942	/* copy offered network mask */
hexley	0:281d6ff68967	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
hexley	0:281d6ff68967	944	} else {
hexley	0:281d6ff68967	945	/* subnet mask not given, choose a safe subnet mask given the network class */
hexley	0:281d6ff68967	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
hexley	0:281d6ff68967	947	if (first_octet <= 127) {
hexley	0:281d6ff68967	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
hexley	0:281d6ff68967	949	} else if (first_octet >= 192) {
hexley	0:281d6ff68967	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
hexley	0:281d6ff68967	951	} else {
hexley	0:281d6ff68967	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
hexley	0:281d6ff68967	953	}
hexley	0:281d6ff68967	954	}
hexley	0:281d6ff68967	955
hexley	0:281d6ff68967	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
hexley	0:281d6ff68967	957	/* gateway address not given? */
hexley	0:281d6ff68967	958	if (ip_addr_isany(&gw_addr)) {
hexley	0:281d6ff68967	959	/* copy network address */
hexley	0:281d6ff68967	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
hexley	0:281d6ff68967	961	/* use first host address on network as gateway */
hexley	0:281d6ff68967	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
hexley	0:281d6ff68967	963	}
hexley	0:281d6ff68967	964
hexley	0:281d6ff68967	965	#if LWIP_DHCP_AUTOIP_COOP
hexley	0:281d6ff68967	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
hexley	0:281d6ff68967	967	autoip_stop(netif);
hexley	0:281d6ff68967	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
hexley	0:281d6ff68967	969	}
hexley	0:281d6ff68967	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
hexley	0:281d6ff68967	971
hexley	0:281d6ff68967	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
hexley	0:281d6ff68967	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
hexley	0:281d6ff68967	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
hexley	0:281d6ff68967	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
hexley	0:281d6ff68967	976	ip4_addr_get_u32(&sn_mask)));
hexley	0:281d6ff68967	977	netif_set_netmask(netif, &sn_mask);
hexley	0:281d6ff68967	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
hexley	0:281d6ff68967	979	ip4_addr_get_u32(&gw_addr)));
hexley	0:281d6ff68967	980	netif_set_gw(netif, &gw_addr);
hexley	0:281d6ff68967	981	/* bring the interface up */
hexley	0:281d6ff68967	982	netif_set_up(netif);
hexley	0:281d6ff68967	983	/* netif is now bound to DHCP leased address */
hexley	0:281d6ff68967	984	dhcp_set_state(dhcp, DHCP_BOUND);
hexley	0:281d6ff68967	985	}
hexley	0:281d6ff68967	986
hexley	0:281d6ff68967	987	/**
hexley	0:281d6ff68967	988	* Renew an existing DHCP lease at the involved DHCP server.
hexley	0:281d6ff68967	989	*
hexley	0:281d6ff68967	990	* @param netif network interface which must renew its lease
hexley	0:281d6ff68967	991	*/
hexley	0:281d6ff68967	992	err_t
hexley	0:281d6ff68967	993	dhcp_renew(struct netif *netif)
hexley	0:281d6ff68967	994	{
hexley	0:281d6ff68967	995	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	996	err_t result;
hexley	0:281d6ff68967	997	u16_t msecs;
hexley	0:281d6ff68967	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
hexley	0:281d6ff68967	999	dhcp_set_state(dhcp, DHCP_RENEWING);
hexley	0:281d6ff68967	1000
hexley	0:281d6ff68967	1001	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
hexley	0:281d6ff68967	1003	if (result == ERR_OK) {
hexley	0:281d6ff68967	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
hexley	0:281d6ff68967	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
hexley	0:281d6ff68967	1006
hexley	0:281d6ff68967	1007	#if LWIP_NETIF_HOSTNAME
hexley	0:281d6ff68967	1008	if (netif->hostname != NULL) {
hexley	0:281d6ff68967	1009	const char p = (const char)netif->hostname;
hexley	0:281d6ff68967	1010	u8_t namelen = (u8_t)strlen(p);
hexley	0:281d6ff68967	1011	if (namelen > 0) {
hexley	0:281d6ff68967	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
hexley	0:281d6ff68967	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
hexley	0:281d6ff68967	1014	while (*p) {
hexley	0:281d6ff68967	1015	dhcp_option_byte(dhcp, *p++);
hexley	0:281d6ff68967	1016	}
hexley	0:281d6ff68967	1017	}
hexley	0:281d6ff68967	1018	}
hexley	0:281d6ff68967	1019	#endif /* LWIP_NETIF_HOSTNAME */
hexley	0:281d6ff68967	1020
hexley	0:281d6ff68967	1021	#if 0
hexley	0:281d6ff68967	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
hexley	0:281d6ff68967	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
hexley	0:281d6ff68967	1024	#endif
hexley	0:281d6ff68967	1025
hexley	0:281d6ff68967	1026	#if 0
hexley	0:281d6ff68967	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
hexley	0:281d6ff68967	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
hexley	0:281d6ff68967	1029	#endif
hexley	0:281d6ff68967	1030	/* append DHCP message trailer */
hexley	0:281d6ff68967	1031	dhcp_option_trailer(dhcp);
hexley	0:281d6ff68967	1032
hexley	0:281d6ff68967	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
hexley	0:281d6ff68967	1034
hexley	0:281d6ff68967	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	1036	dhcp_delete_msg(dhcp);
hexley	0:281d6ff68967	1037
hexley	0:281d6ff68967	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
hexley	0:281d6ff68967	1039	} else {
hexley	0:281d6ff68967	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	1041	}
hexley	0:281d6ff68967	1042	dhcp->tries++;
hexley	0:281d6ff68967	1043	/* back-off on retries, but to a maximum of 20 seconds */
hexley	0:281d6ff68967	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
hexley	0:281d6ff68967	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	1047	return result;
hexley	0:281d6ff68967	1048	}
hexley	0:281d6ff68967	1049
hexley	0:281d6ff68967	1050	/**
hexley	0:281d6ff68967	1051	* Rebind with a DHCP server for an existing DHCP lease.
hexley	0:281d6ff68967	1052	*
hexley	0:281d6ff68967	1053	* @param netif network interface which must rebind with a DHCP server
hexley	0:281d6ff68967	1054	*/
hexley	0:281d6ff68967	1055	static err_t
hexley	0:281d6ff68967	1056	dhcp_rebind(struct netif *netif)
hexley	0:281d6ff68967	1057	{
hexley	0:281d6ff68967	1058	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	1059	err_t result;
hexley	0:281d6ff68967	1060	u16_t msecs;
hexley	0:281d6ff68967	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
hexley	0:281d6ff68967	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
hexley	0:281d6ff68967	1063
hexley	0:281d6ff68967	1064	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
hexley	0:281d6ff68967	1066	if (result == ERR_OK) {
hexley	0:281d6ff68967	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
hexley	0:281d6ff68967	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
hexley	0:281d6ff68967	1069
hexley	0:281d6ff68967	1070	#if LWIP_NETIF_HOSTNAME
hexley	0:281d6ff68967	1071	if (netif->hostname != NULL) {
hexley	0:281d6ff68967	1072	const char p = (const char)netif->hostname;
hexley	0:281d6ff68967	1073	u8_t namelen = (u8_t)strlen(p);
hexley	0:281d6ff68967	1074	if (namelen > 0) {
hexley	0:281d6ff68967	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
hexley	0:281d6ff68967	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
hexley	0:281d6ff68967	1077	while (*p) {
hexley	0:281d6ff68967	1078	dhcp_option_byte(dhcp, *p++);
hexley	0:281d6ff68967	1079	}
hexley	0:281d6ff68967	1080	}
hexley	0:281d6ff68967	1081	}
hexley	0:281d6ff68967	1082	#endif /* LWIP_NETIF_HOSTNAME */
hexley	0:281d6ff68967	1083
hexley	0:281d6ff68967	1084	#if 0
hexley	0:281d6ff68967	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
hexley	0:281d6ff68967	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
hexley	0:281d6ff68967	1087
hexley	0:281d6ff68967	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
hexley	0:281d6ff68967	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
hexley	0:281d6ff68967	1090	#endif
hexley	0:281d6ff68967	1091
hexley	0:281d6ff68967	1092	dhcp_option_trailer(dhcp);
hexley	0:281d6ff68967	1093
hexley	0:281d6ff68967	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
hexley	0:281d6ff68967	1095
hexley	0:281d6ff68967	1096	/* broadcast to server */
hexley	0:281d6ff68967	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	1098	dhcp_delete_msg(dhcp);
hexley	0:281d6ff68967	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
hexley	0:281d6ff68967	1100	} else {
hexley	0:281d6ff68967	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	1102	}
hexley	0:281d6ff68967	1103	dhcp->tries++;
hexley	0:281d6ff68967	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
hexley	0:281d6ff68967	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	1107	return result;
hexley	0:281d6ff68967	1108	}
hexley	0:281d6ff68967	1109
hexley	0:281d6ff68967	1110	/**
hexley	0:281d6ff68967	1111	* Enter REBOOTING state to verify an existing lease
hexley	0:281d6ff68967	1112	*
hexley	0:281d6ff68967	1113	* @param netif network interface which must reboot
hexley	0:281d6ff68967	1114	*/
hexley	0:281d6ff68967	1115	static err_t
hexley	0:281d6ff68967	1116	dhcp_reboot(struct netif *netif)
hexley	0:281d6ff68967	1117	{
hexley	0:281d6ff68967	1118	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	1119	err_t result;
hexley	0:281d6ff68967	1120	u16_t msecs;
hexley	0:281d6ff68967	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
hexley	0:281d6ff68967	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
hexley	0:281d6ff68967	1123
hexley	0:281d6ff68967	1124	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
hexley	0:281d6ff68967	1126	if (result == ERR_OK) {
hexley	0:281d6ff68967	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
hexley	0:281d6ff68967	1128	dhcp_option_short(dhcp, 576);
hexley	0:281d6ff68967	1129
hexley	0:281d6ff68967	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
hexley	0:281d6ff68967	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
hexley	0:281d6ff68967	1132
hexley	0:281d6ff68967	1133	dhcp_option_trailer(dhcp);
hexley	0:281d6ff68967	1134
hexley	0:281d6ff68967	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
hexley	0:281d6ff68967	1136
hexley	0:281d6ff68967	1137	/* broadcast to server */
hexley	0:281d6ff68967	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	1139	dhcp_delete_msg(dhcp);
hexley	0:281d6ff68967	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
hexley	0:281d6ff68967	1141	} else {
hexley	0:281d6ff68967	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	1143	}
hexley	0:281d6ff68967	1144	dhcp->tries++;
hexley	0:281d6ff68967	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
hexley	0:281d6ff68967	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	1148	return result;
hexley	0:281d6ff68967	1149	}
hexley	0:281d6ff68967	1150
hexley	0:281d6ff68967	1151
hexley	0:281d6ff68967	1152	/**
hexley	0:281d6ff68967	1153	* Release a DHCP lease.
hexley	0:281d6ff68967	1154	*
hexley	0:281d6ff68967	1155	* @param netif network interface which must release its lease
hexley	0:281d6ff68967	1156	*/
hexley	0:281d6ff68967	1157	err_t
hexley	0:281d6ff68967	1158	dhcp_release(struct netif *netif)
hexley	0:281d6ff68967	1159	{
hexley	0:281d6ff68967	1160	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	1161	err_t result;
hexley	0:281d6ff68967	1162	u16_t msecs;
hexley	0:281d6ff68967	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
hexley	0:281d6ff68967	1164
hexley	0:281d6ff68967	1165	/* idle DHCP client */
hexley	0:281d6ff68967	1166	dhcp_set_state(dhcp, DHCP_OFF);
hexley	0:281d6ff68967	1167	/* clean old DHCP offer */
hexley	0:281d6ff68967	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
hexley	0:281d6ff68967	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
hexley	0:281d6ff68967	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
hexley	0:281d6ff68967	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
hexley	0:281d6ff68967	1172	#if LWIP_DHCP_BOOTP_FILE
hexley	0:281d6ff68967	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
hexley	0:281d6ff68967	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
hexley	0:281d6ff68967	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
hexley	0:281d6ff68967	1176
hexley	0:281d6ff68967	1177	/* create and initialize the DHCP message header */
hexley	0:281d6ff68967	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
hexley	0:281d6ff68967	1179	if (result == ERR_OK) {
hexley	0:281d6ff68967	1180	dhcp_option_trailer(dhcp);
hexley	0:281d6ff68967	1181
hexley	0:281d6ff68967	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
hexley	0:281d6ff68967	1183
hexley	0:281d6ff68967	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
hexley	0:281d6ff68967	1185	dhcp_delete_msg(dhcp);
hexley	0:281d6ff68967	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
hexley	0:281d6ff68967	1187	} else {
hexley	0:281d6ff68967	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
hexley	0:281d6ff68967	1189	}
hexley	0:281d6ff68967	1190	dhcp->tries++;
hexley	0:281d6ff68967	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
hexley	0:281d6ff68967	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
hexley	0:281d6ff68967	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
hexley	0:281d6ff68967	1194	/* bring the interface down */
hexley	0:281d6ff68967	1195	netif_set_down(netif);
hexley	0:281d6ff68967	1196	/* remove IP address from interface */
hexley	0:281d6ff68967	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
hexley	0:281d6ff68967	1198	netif_set_gw(netif, IP_ADDR_ANY);
hexley	0:281d6ff68967	1199	netif_set_netmask(netif, IP_ADDR_ANY);
hexley	0:281d6ff68967	1200
hexley	0:281d6ff68967	1201	return result;
hexley	0:281d6ff68967	1202	}
hexley	0:281d6ff68967	1203
hexley	0:281d6ff68967	1204	/**
hexley	0:281d6ff68967	1205	* Remove the DHCP client from the interface.
hexley	0:281d6ff68967	1206	*
hexley	0:281d6ff68967	1207	* @param netif The network interface to stop DHCP on
hexley	0:281d6ff68967	1208	*/
hexley	0:281d6ff68967	1209	void
hexley	0:281d6ff68967	1210	dhcp_stop(struct netif *netif)
hexley	0:281d6ff68967	1211	{
hexley	0:281d6ff68967	1212	struct dhcp *dhcp;
hexley	0:281d6ff68967	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
hexley	0:281d6ff68967	1214	dhcp = netif->dhcp;
hexley	0:281d6ff68967	1215	/* Remove the flag that says this netif is handled by DHCP. */
hexley	0:281d6ff68967	1216	netif->flags &= ~NETIF_FLAG_DHCP;
hexley	0:281d6ff68967	1217
hexley	0:281d6ff68967	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
hexley	0:281d6ff68967	1219	/* netif is DHCP configured? */
hexley	0:281d6ff68967	1220	if (dhcp != NULL) {
hexley	0:281d6ff68967	1221	#if LWIP_DHCP_AUTOIP_COOP
hexley	0:281d6ff68967	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
hexley	0:281d6ff68967	1223	autoip_stop(netif);
hexley	0:281d6ff68967	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
hexley	0:281d6ff68967	1225	}
hexley	0:281d6ff68967	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
hexley	0:281d6ff68967	1227
hexley	0:281d6ff68967	1228	if (dhcp->pcb != NULL) {
hexley	0:281d6ff68967	1229	udp_remove(dhcp->pcb);
hexley	0:281d6ff68967	1230	dhcp->pcb = NULL;
hexley	0:281d6ff68967	1231	}
hexley	0:281d6ff68967	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
hexley	0:281d6ff68967	1233	dhcp_set_state(dhcp, DHCP_OFF);
hexley	0:281d6ff68967	1234	}
hexley	0:281d6ff68967	1235	}
hexley	0:281d6ff68967	1236
hexley	0:281d6ff68967	1237	/*
hexley	0:281d6ff68967	1238	* Set the DHCP state of a DHCP client.
hexley	0:281d6ff68967	1239	*
hexley	0:281d6ff68967	1240	* If the state changed, reset the number of tries.
hexley	0:281d6ff68967	1241	*/
hexley	0:281d6ff68967	1242	static void
hexley	0:281d6ff68967	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
hexley	0:281d6ff68967	1244	{
hexley	0:281d6ff68967	1245	if (new_state != dhcp->state) {
hexley	0:281d6ff68967	1246	dhcp->state = new_state;
hexley	0:281d6ff68967	1247	dhcp->tries = 0;
hexley	0:281d6ff68967	1248	dhcp->request_timeout = 0;
hexley	0:281d6ff68967	1249	}
hexley	0:281d6ff68967	1250	}
hexley	0:281d6ff68967	1251
hexley	0:281d6ff68967	1252	/*
hexley	0:281d6ff68967	1253	* Concatenate an option type and length field to the outgoing
hexley	0:281d6ff68967	1254	* DHCP message.
hexley	0:281d6ff68967	1255	*
hexley	0:281d6ff68967	1256	*/
hexley	0:281d6ff68967	1257	static void
hexley	0:281d6ff68967	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
hexley	0:281d6ff68967	1259	{
hexley	0:281d6ff68967	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);
hexley	0:281d6ff68967	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
hexley	0:281d6ff68967	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
hexley	0:281d6ff68967	1263	}
hexley	0:281d6ff68967	1264	/*
hexley	0:281d6ff68967	1265	* Concatenate a single byte to the outgoing DHCP message.
hexley	0:281d6ff68967	1266	*
hexley	0:281d6ff68967	1267	*/
hexley	0:281d6ff68967	1268	static void
hexley	0:281d6ff68967	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
hexley	0:281d6ff68967	1270	{
hexley	0:281d6ff68967	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
hexley	0:281d6ff68967	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
hexley	0:281d6ff68967	1273	}
hexley	0:281d6ff68967	1274
hexley	0:281d6ff68967	1275	static void
hexley	0:281d6ff68967	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
hexley	0:281d6ff68967	1277	{
hexley	0:281d6ff68967	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
hexley	0:281d6ff68967	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
hexley	0:281d6ff68967	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
hexley	0:281d6ff68967	1281	}
hexley	0:281d6ff68967	1282
hexley	0:281d6ff68967	1283	static void
hexley	0:281d6ff68967	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
hexley	0:281d6ff68967	1285	{
hexley	0:281d6ff68967	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
hexley	0:281d6ff68967	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
hexley	0:281d6ff68967	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
hexley	0:281d6ff68967	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
hexley	0:281d6ff68967	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
hexley	0:281d6ff68967	1291	}
hexley	0:281d6ff68967	1292
hexley	0:281d6ff68967	1293	/**
hexley	0:281d6ff68967	1294	* Extract the DHCP message and the DHCP options.
hexley	0:281d6ff68967	1295	*
hexley	0:281d6ff68967	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
hexley	0:281d6ff68967	1297	* piece of memory. As a DHCP message is variable sized by its options,
hexley	0:281d6ff68967	1298	* and also allows overriding some fields for options, the easy approach
hexley	0:281d6ff68967	1299	* is to first unfold the options into a conitguous piece of memory, and
hexley	0:281d6ff68967	1300	* use that further on.
hexley	0:281d6ff68967	1301	*
hexley	0:281d6ff68967	1302	*/
hexley	0:281d6ff68967	1303	static err_t
hexley	0:281d6ff68967	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
hexley	0:281d6ff68967	1305	{
hexley	0:281d6ff68967	1306	u8_t *options;
hexley	0:281d6ff68967	1307	u16_t offset;
hexley	0:281d6ff68967	1308	u16_t offset_max;
hexley	0:281d6ff68967	1309	u16_t options_idx;
hexley	0:281d6ff68967	1310	u16_t options_idx_max;
hexley	0:281d6ff68967	1311	struct pbuf *q;
hexley	0:281d6ff68967	1312	int parse_file_as_options = 0;
hexley	0:281d6ff68967	1313	int parse_sname_as_options = 0;
hexley	0:281d6ff68967	1314
hexley	0:281d6ff68967	1315	/* clear received options */
hexley	0:281d6ff68967	1316	dhcp_clear_all_options(dhcp);
hexley	0:281d6ff68967	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
hexley	0:281d6ff68967	1318	if (p->len < DHCP_SNAME_OFS) {
hexley	0:281d6ff68967	1319	return ERR_BUF;
hexley	0:281d6ff68967	1320	}
hexley	0:281d6ff68967	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
hexley	0:281d6ff68967	1322	#if LWIP_DHCP_BOOTP_FILE
hexley	0:281d6ff68967	1323	/* clear boot file name */
hexley	0:281d6ff68967	1324	dhcp->boot_file_name[0] = 0;
hexley	0:281d6ff68967	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
hexley	0:281d6ff68967	1326
hexley	0:281d6ff68967	1327	/* parse options */
hexley	0:281d6ff68967	1328
hexley	0:281d6ff68967	1329	/* start with options field */
hexley	0:281d6ff68967	1330	options_idx = DHCP_OPTIONS_OFS;
hexley	0:281d6ff68967	1331	/* parse options to the end of the received packet */
hexley	0:281d6ff68967	1332	options_idx_max = p->tot_len;
hexley	0:281d6ff68967	1333	again:
hexley	0:281d6ff68967	1334	q = p;
hexley	0:281d6ff68967	1335	while((q != NULL) && (options_idx >= q->len)) {
hexley	0:281d6ff68967	1336	options_idx -= q->len;
hexley	0:281d6ff68967	1337	options_idx_max -= q->len;
hexley	0:281d6ff68967	1338	q = q->next;
hexley	0:281d6ff68967	1339	}
hexley	0:281d6ff68967	1340	if (q == NULL) {
hexley	0:281d6ff68967	1341	return ERR_BUF;
hexley	0:281d6ff68967	1342	}
hexley	0:281d6ff68967	1343	offset = options_idx;
hexley	0:281d6ff68967	1344	offset_max = options_idx_max;
hexley	0:281d6ff68967	1345	options = (u8_t*)q->payload;
hexley	0:281d6ff68967	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
hexley	0:281d6ff68967	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
hexley	0:281d6ff68967	1348	u8_t op = options[offset];
hexley	0:281d6ff68967	1349	u8_t len;
hexley	0:281d6ff68967	1350	u8_t decode_len = 0;
hexley	0:281d6ff68967	1351	int decode_idx = -1;
hexley	0:281d6ff68967	1352	u16_t val_offset = offset + 2;
hexley	0:281d6ff68967	1353	/* len byte might be in the next pbuf */
hexley	0:281d6ff68967	1354	if (offset + 1 < q->len) {
hexley	0:281d6ff68967	1355	len = options[offset + 1];
hexley	0:281d6ff68967	1356	} else {
hexley	0:281d6ff68967	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
hexley	0:281d6ff68967	1358	}
hexley	0:281d6ff68967	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
hexley	0:281d6ff68967	1360	decode_len = len;
hexley	0:281d6ff68967	1361	switch(op) {
hexley	0:281d6ff68967	1362	/* case(DHCP_OPTION_END): handled above */
hexley	0:281d6ff68967	1363	case(DHCP_OPTION_PAD):
hexley	0:281d6ff68967	1364	/* special option: no len encoded */
hexley	0:281d6ff68967	1365	decode_len = len = 0;
hexley	0:281d6ff68967	1366	/* will be increased below */
hexley	0:281d6ff68967	1367	offset--;
hexley	0:281d6ff68967	1368	break;
hexley	0:281d6ff68967	1369	case(DHCP_OPTION_SUBNET_MASK):
hexley	0:281d6ff68967	1370	LWIP_ASSERT("len == 4", len == 4);
hexley	0:281d6ff68967	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
hexley	0:281d6ff68967	1372	break;
hexley	0:281d6ff68967	1373	case(DHCP_OPTION_ROUTER):
hexley	0:281d6ff68967	1374	decode_len = 4; /* only copy the first given router */
hexley	0:281d6ff68967	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
hexley	0:281d6ff68967	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
hexley	0:281d6ff68967	1377	break;
hexley	0:281d6ff68967	1378	case(DHCP_OPTION_DNS_SERVER):
hexley	0:281d6ff68967	1379	/* special case: there might be more than one server */
hexley	0:281d6ff68967	1380	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
hexley	0:281d6ff68967	1381	/* limit number of DNS servers */
hexley	0:281d6ff68967	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
hexley	0:281d6ff68967	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
hexley	0:281d6ff68967	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
hexley	0:281d6ff68967	1385	break;
hexley	0:281d6ff68967	1386	case(DHCP_OPTION_LEASE_TIME):
hexley	0:281d6ff68967	1387	LWIP_ASSERT("len == 4", len == 4);
hexley	0:281d6ff68967	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
hexley	0:281d6ff68967	1389	break;
hexley	0:281d6ff68967	1390	case(DHCP_OPTION_OVERLOAD):
hexley	0:281d6ff68967	1391	LWIP_ASSERT("len == 1", len == 1);
hexley	0:281d6ff68967	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
hexley	0:281d6ff68967	1393	break;
hexley	0:281d6ff68967	1394	case(DHCP_OPTION_MESSAGE_TYPE):
hexley	0:281d6ff68967	1395	LWIP_ASSERT("len == 1", len == 1);
hexley	0:281d6ff68967	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
hexley	0:281d6ff68967	1397	break;
hexley	0:281d6ff68967	1398	case(DHCP_OPTION_SERVER_ID):
hexley	0:281d6ff68967	1399	LWIP_ASSERT("len == 4", len == 4);
hexley	0:281d6ff68967	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
hexley	0:281d6ff68967	1401	break;
hexley	0:281d6ff68967	1402	case(DHCP_OPTION_T1):
hexley	0:281d6ff68967	1403	LWIP_ASSERT("len == 4", len == 4);
hexley	0:281d6ff68967	1404	decode_idx = DHCP_OPTION_IDX_T1;
hexley	0:281d6ff68967	1405	break;
hexley	0:281d6ff68967	1406	case(DHCP_OPTION_T2):
hexley	0:281d6ff68967	1407	LWIP_ASSERT("len == 4", len == 4);
hexley	0:281d6ff68967	1408	decode_idx = DHCP_OPTION_IDX_T2;
hexley	0:281d6ff68967	1409	break;
hexley	0:281d6ff68967	1410	default:
hexley	0:281d6ff68967	1411	decode_len = 0;
hexley	0:281d6ff68967	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
hexley	0:281d6ff68967	1413	break;
hexley	0:281d6ff68967	1414	}
hexley	0:281d6ff68967	1415	offset += len + 2;
hexley	0:281d6ff68967	1416	if (decode_len > 0) {
hexley	0:281d6ff68967	1417	u32_t value = 0;
hexley	0:281d6ff68967	1418	u16_t copy_len;
hexley	0:281d6ff68967	1419	decode_next:
hexley	0:281d6ff68967	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
hexley	0:281d6ff68967	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
hexley	0:281d6ff68967	1422	copy_len = LWIP_MIN(decode_len, 4);
hexley	0:281d6ff68967	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
hexley	0:281d6ff68967	1424	if (decode_len > 4) {
hexley	0:281d6ff68967	1425	/* decode more than one u32_t */
hexley	0:281d6ff68967	1426	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
hexley	0:281d6ff68967	1427	dhcp_got_option(dhcp, decode_idx);
hexley	0:281d6ff68967	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
hexley	0:281d6ff68967	1429	decode_len -= 4;
hexley	0:281d6ff68967	1430	val_offset += 4;
hexley	0:281d6ff68967	1431	decode_idx++;
hexley	0:281d6ff68967	1432	goto decode_next;
hexley	0:281d6ff68967	1433	} else if (decode_len == 4) {
hexley	0:281d6ff68967	1434	value = ntohl(value);
hexley	0:281d6ff68967	1435	} else {
hexley	0:281d6ff68967	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
hexley	0:281d6ff68967	1437	value = ((u8_t*)&value)[0];
hexley	0:281d6ff68967	1438	}
hexley	0:281d6ff68967	1439	dhcp_got_option(dhcp, decode_idx);
hexley	0:281d6ff68967	1440	dhcp_set_option_value(dhcp, decode_idx, value);
hexley	0:281d6ff68967	1441	}
hexley	0:281d6ff68967	1442	if (offset >= q->len) {
hexley	0:281d6ff68967	1443	offset -= q->len;
hexley	0:281d6ff68967	1444	offset_max -= q->len;
hexley	0:281d6ff68967	1445	q = q->next;
hexley	0:281d6ff68967	1446	options = (u8_t*)q->payload;
hexley	0:281d6ff68967	1447	}
hexley	0:281d6ff68967	1448	}
hexley	0:281d6ff68967	1449	/* is this an overloaded message? */
hexley	0:281d6ff68967	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
hexley	0:281d6ff68967	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
hexley	0:281d6ff68967	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
hexley	0:281d6ff68967	1453	if (overload == DHCP_OVERLOAD_FILE) {
hexley	0:281d6ff68967	1454	parse_file_as_options = 1;
hexley	0:281d6ff68967	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
hexley	0:281d6ff68967	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
hexley	0:281d6ff68967	1457	parse_sname_as_options = 1;
hexley	0:281d6ff68967	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
hexley	0:281d6ff68967	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
hexley	0:281d6ff68967	1460	parse_sname_as_options = 1;
hexley	0:281d6ff68967	1461	parse_file_as_options = 1;
hexley	0:281d6ff68967	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
hexley	0:281d6ff68967	1463	} else {
hexley	0:281d6ff68967	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
hexley	0:281d6ff68967	1465	}
hexley	0:281d6ff68967	1466	#if LWIP_DHCP_BOOTP_FILE
hexley	0:281d6ff68967	1467	if (!parse_file_as_options) {
hexley	0:281d6ff68967	1468	/* only do this for ACK messages */
hexley	0:281d6ff68967	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
hexley	0:281d6ff68967	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
hexley	0:281d6ff68967	1471	/* copy bootp file name, don't care for sname (server hostname) */
hexley	0:281d6ff68967	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
hexley	0:281d6ff68967	1473	/* make sure the string is really NULL-terminated */
hexley	0:281d6ff68967	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
hexley	0:281d6ff68967	1475	}
hexley	0:281d6ff68967	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
hexley	0:281d6ff68967	1477	}
hexley	0:281d6ff68967	1478	if (parse_file_as_options) {
hexley	0:281d6ff68967	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
hexley	0:281d6ff68967	1480	parse_file_as_options = 0;
hexley	0:281d6ff68967	1481	options_idx = DHCP_FILE_OFS;
hexley	0:281d6ff68967	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
hexley	0:281d6ff68967	1483	goto again;
hexley	0:281d6ff68967	1484	} else if (parse_sname_as_options) {
hexley	0:281d6ff68967	1485	parse_sname_as_options = 0;
hexley	0:281d6ff68967	1486	options_idx = DHCP_SNAME_OFS;
hexley	0:281d6ff68967	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
hexley	0:281d6ff68967	1488	goto again;
hexley	0:281d6ff68967	1489	}
hexley	0:281d6ff68967	1490	return ERR_OK;
hexley	0:281d6ff68967	1491	}
hexley	0:281d6ff68967	1492
hexley	0:281d6ff68967	1493	/**
hexley	0:281d6ff68967	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
hexley	0:281d6ff68967	1495	*/
hexley	0:281d6ff68967	1496	static void
hexley	0:281d6ff68967	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
hexley	0:281d6ff68967	1498	{
hexley	0:281d6ff68967	1499	struct netif netif = (struct netif )arg;
hexley	0:281d6ff68967	1500	struct dhcp *dhcp = netif->dhcp;
hexley	0:281d6ff68967	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
hexley	0:281d6ff68967	1502	u8_t msg_type;
hexley	0:281d6ff68967	1503	u8_t i;
hexley	0:281d6ff68967	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,
hexley	0:281d6ff68967	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
hexley	0:281d6ff68967	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
hexley	0:281d6ff68967	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
hexley	0:281d6ff68967	1508	/* prevent warnings about unused arguments */
hexley	0:281d6ff68967	1509	LWIP_UNUSED_ARG(pcb);
hexley	0:281d6ff68967	1510	LWIP_UNUSED_ARG(addr);
hexley	0:281d6ff68967	1511	LWIP_UNUSED_ARG(port);
hexley	0:281d6ff68967	1512
hexley	0:281d6ff68967	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
hexley	0:281d6ff68967	1514
hexley	0:281d6ff68967	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
hexley	0:281d6ff68967	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
hexley	0:281d6ff68967	1517	goto free_pbuf_and_return;
hexley	0:281d6ff68967	1518	}
hexley	0:281d6ff68967	1519
hexley	0:281d6ff68967	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
hexley	0:281d6ff68967	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));
hexley	0:281d6ff68967	1522	goto free_pbuf_and_return;
hexley	0:281d6ff68967	1523	}
hexley	0:281d6ff68967	1524	/* iterate through hardware address and match against DHCP message */
hexley	0:281d6ff68967	1525	for (i = 0; i < netif->hwaddr_len; i++) {
hexley	0:281d6ff68967	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
hexley	0:281d6ff68967	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
hexley	0:281d6ff68967	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
hexley	0:281d6ff68967	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
hexley	0:281d6ff68967	1530	goto free_pbuf_and_return;
hexley	0:281d6ff68967	1531	}
hexley	0:281d6ff68967	1532	}
hexley	0:281d6ff68967	1533	/* match transaction ID against what we expected */
hexley	0:281d6ff68967	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
hexley	0:281d6ff68967	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
hexley	0:281d6ff68967	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
hexley	0:281d6ff68967	1537	goto free_pbuf_and_return;
hexley	0:281d6ff68967	1538	}
hexley	0:281d6ff68967	1539	/* option fields could be unfold? */
hexley	0:281d6ff68967	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
hexley	0:281d6ff68967	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
hexley	0:281d6ff68967	1542	("problem unfolding DHCP message - too short on memory?\n"));
hexley	0:281d6ff68967	1543	goto free_pbuf_and_return;
hexley	0:281d6ff68967	1544	}
hexley	0:281d6ff68967	1545
hexley	0:281d6ff68967	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
hexley	0:281d6ff68967	1547	/* obtain pointer to DHCP message type */
hexley	0:281d6ff68967	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
hexley	0:281d6ff68967	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
hexley	0:281d6ff68967	1550	goto free_pbuf_and_return;
hexley	0:281d6ff68967	1551	}
hexley	0:281d6ff68967	1552
hexley	0:281d6ff68967	1553	/* read DHCP message type */
hexley	0:281d6ff68967	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
hexley	0:281d6ff68967	1555	/* message type is DHCP ACK? */
hexley	0:281d6ff68967	1556	if (msg_type == DHCP_ACK) {
hexley	0:281d6ff68967	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
hexley	0:281d6ff68967	1558	/* in requesting state? */
hexley	0:281d6ff68967	1559	if (dhcp->state == DHCP_REQUESTING) {
hexley	0:281d6ff68967	1560	dhcp_handle_ack(netif);
hexley	0:281d6ff68967	1561	#if DHCP_DOES_ARP_CHECK
hexley	0:281d6ff68967	1562	/* check if the acknowledged lease address is already in use */
hexley	0:281d6ff68967	1563	dhcp_check(netif);
hexley	0:281d6ff68967	1564	#else
hexley	0:281d6ff68967	1565	/* bind interface to the acknowledged lease address */
hexley	0:281d6ff68967	1566	dhcp_bind(netif);
hexley	0:281d6ff68967	1567	#endif
hexley	0:281d6ff68967	1568	}
hexley	0:281d6ff68967	1569	/* already bound to the given lease address? */
hexley	0:281d6ff68967	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
hexley	0:281d6ff68967	1571	dhcp_bind(netif);
hexley	0:281d6ff68967	1572	}
hexley	0:281d6ff68967	1573	}
hexley	0:281d6ff68967	1574	/* received a DHCP_NAK in appropriate state? */
hexley	0:281d6ff68967	1575	else if ((msg_type == DHCP_NAK) &&
hexley	0:281d6ff68967	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
hexley	0:281d6ff68967	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
hexley	0:281d6ff68967	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
hexley	0:281d6ff68967	1579	dhcp_handle_nak(netif);
hexley	0:281d6ff68967	1580	}
hexley	0:281d6ff68967	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
hexley	0:281d6ff68967	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
hexley	0:281d6ff68967	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
hexley	0:281d6ff68967	1584	dhcp->request_timeout = 0;
hexley	0:281d6ff68967	1585	/* remember offered lease */
hexley	0:281d6ff68967	1586	dhcp_handle_offer(netif);
hexley	0:281d6ff68967	1587	}
hexley	0:281d6ff68967	1588	free_pbuf_and_return:
hexley	0:281d6ff68967	1589	dhcp->msg_in = NULL;
hexley	0:281d6ff68967	1590	pbuf_free(p);
hexley	0:281d6ff68967	1591	}
hexley	0:281d6ff68967	1592
hexley	0:281d6ff68967	1593	/**
hexley	0:281d6ff68967	1594	* Create a DHCP request, fill in common headers
hexley	0:281d6ff68967	1595	*
hexley	0:281d6ff68967	1596	* @param netif the netif under DHCP control
hexley	0:281d6ff68967	1597	* @param dhcp dhcp control struct
hexley	0:281d6ff68967	1598	* @param message_type message type of the request
hexley	0:281d6ff68967	1599	*/
hexley	0:281d6ff68967	1600	static err_t
hexley	0:281d6ff68967	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
hexley	0:281d6ff68967	1602	{
hexley	0:281d6ff68967	1603	u16_t i;
hexley	0:281d6ff68967	1604	#ifndef DHCP_GLOBAL_XID
hexley	0:281d6ff68967	1605	/** default global transaction identifier starting value (easy to match
hexley	0:281d6ff68967	1606	* with a packet analyser). We simply increment for each new request.
hexley	0:281d6ff68967	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
hexley	0:281d6ff68967	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
hexley	0:281d6ff68967	1609	static u32_t xid = 0xABCD0000;
hexley	0:281d6ff68967	1610	#else
hexley	0:281d6ff68967	1611	static u32_t xid;
hexley	0:281d6ff68967	1612	static u8_t xid_initialised = 0;
hexley	0:281d6ff68967	1613	if (!xid_initialised) {
hexley	0:281d6ff68967	1614	xid = DHCP_GLOBAL_XID;
hexley	0:281d6ff68967	1615	xid_initialised = !xid_initialised;
hexley	0:281d6ff68967	1616	}
hexley	0:281d6ff68967	1617	#endif
hexley	0:281d6ff68967	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
hexley	0:281d6ff68967	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
hexley	0:281d6ff68967	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
hexley	0:281d6ff68967	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
hexley	0:281d6ff68967	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
hexley	0:281d6ff68967	1623	if (dhcp->p_out == NULL) {
hexley	0:281d6ff68967	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
hexley	0:281d6ff68967	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
hexley	0:281d6ff68967	1626	return ERR_MEM;
hexley	0:281d6ff68967	1627	}
hexley	0:281d6ff68967	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
hexley	0:281d6ff68967	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
hexley	0:281d6ff68967	1630
hexley	0:281d6ff68967	1631	/* reuse transaction identifier in retransmissions */
hexley	0:281d6ff68967	1632	if (dhcp->tries == 0) {
hexley	0:281d6ff68967	1633	xid++;
hexley	0:281d6ff68967	1634	}
hexley	0:281d6ff68967	1635	dhcp->xid = xid;
hexley	0:281d6ff68967	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
hexley	0:281d6ff68967	1637	("transaction id xid(%"X32_F")\n", xid));
hexley	0:281d6ff68967	1638
hexley	0:281d6ff68967	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
hexley	0:281d6ff68967	1640
hexley	0:281d6ff68967	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
hexley	0:281d6ff68967	1642	/* TODO: make link layer independent */
hexley	0:281d6ff68967	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
hexley	0:281d6ff68967	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
hexley	0:281d6ff68967	1645	dhcp->msg_out->hops = 0;
hexley	0:281d6ff68967	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
hexley	0:281d6ff68967	1647	dhcp->msg_out->secs = 0;
hexley	0:281d6ff68967	1648	/* we don't need the broadcast flag since we can receive unicast traffic
hexley	0:281d6ff68967	1649	before being fully configured! */
hexley	0:281d6ff68967	1650	dhcp->msg_out->flags = 0;
hexley	0:281d6ff68967	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
hexley	0:281d6ff68967	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
hexley	0:281d6ff68967	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
hexley	0:281d6ff68967	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
hexley	0:281d6ff68967	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
hexley	0:281d6ff68967	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
hexley	0:281d6ff68967	1657	}
hexley	0:281d6ff68967	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
hexley	0:281d6ff68967	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
hexley	0:281d6ff68967	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
hexley	0:281d6ff68967	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
hexley	0:281d6ff68967	1662	/* copy netif hardware address, pad with zeroes */
hexley	0:281d6ff68967	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
hexley	0:281d6ff68967	1664	}
hexley	0:281d6ff68967	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
hexley	0:281d6ff68967	1666	dhcp->msg_out->sname[i] = 0;
hexley	0:281d6ff68967	1667	}
hexley	0:281d6ff68967	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
hexley	0:281d6ff68967	1669	dhcp->msg_out->file[i] = 0;
hexley	0:281d6ff68967	1670	}
hexley	0:281d6ff68967	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
hexley	0:281d6ff68967	1672	dhcp->options_out_len = 0;
hexley	0:281d6ff68967	1673	/* fill options field with an incrementing array (for debugging purposes) */
hexley	0:281d6ff68967	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
hexley	0:281d6ff68967	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
hexley	0:281d6ff68967	1676	}
hexley	0:281d6ff68967	1677	/* Add option MESSAGE_TYPE */
hexley	0:281d6ff68967	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
hexley	0:281d6ff68967	1679	dhcp_option_byte(dhcp, message_type);
hexley	0:281d6ff68967	1680	return ERR_OK;
hexley	0:281d6ff68967	1681	}
hexley	0:281d6ff68967	1682
hexley	0:281d6ff68967	1683	/**
hexley	0:281d6ff68967	1684	* Free previously allocated memory used to send a DHCP request.
hexley	0:281d6ff68967	1685	*
hexley	0:281d6ff68967	1686	* @param dhcp the dhcp struct to free the request from
hexley	0:281d6ff68967	1687	*/
hexley	0:281d6ff68967	1688	static void
hexley	0:281d6ff68967	1689	dhcp_delete_msg(struct dhcp *dhcp)
hexley	0:281d6ff68967	1690	{
hexley	0:281d6ff68967	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
hexley	0:281d6ff68967	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
hexley	0:281d6ff68967	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
hexley	0:281d6ff68967	1694	if (dhcp->p_out != NULL) {
hexley	0:281d6ff68967	1695	pbuf_free(dhcp->p_out);
hexley	0:281d6ff68967	1696	}
hexley	0:281d6ff68967	1697	dhcp->p_out = NULL;
hexley	0:281d6ff68967	1698	dhcp->msg_out = NULL;
hexley	0:281d6ff68967	1699	}
hexley	0:281d6ff68967	1700
hexley	0:281d6ff68967	1701	/**
hexley	0:281d6ff68967	1702	* Add a DHCP message trailer
hexley	0:281d6ff68967	1703	*
hexley	0:281d6ff68967	1704	* Adds the END option to the DHCP message, and if
hexley	0:281d6ff68967	1705	* necessary, up to three padding bytes.
hexley	0:281d6ff68967	1706	*
hexley	0:281d6ff68967	1707	* @param dhcp DHCP state structure
hexley	0:281d6ff68967	1708	*/
hexley	0:281d6ff68967	1709	static void
hexley	0:281d6ff68967	1710	dhcp_option_trailer(struct dhcp *dhcp)
hexley	0:281d6ff68967	1711	{
hexley	0:281d6ff68967	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
hexley	0:281d6ff68967	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
hexley	0:281d6ff68967	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
hexley	0:281d6ff68967	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
hexley	0:281d6ff68967	1716	/* packet is too small, or not 4 byte aligned? */
hexley	0:281d6ff68967	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
hexley	0:281d6ff68967	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)); */
hexley	0:281d6ff68967	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
hexley	0:281d6ff68967	1720	/* add a fill/padding byte */
hexley	0:281d6ff68967	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
hexley	0:281d6ff68967	1722	}
hexley	0:281d6ff68967	1723	}
hexley	0:281d6ff68967	1724
hexley	0:281d6ff68967	1725	#endif /* LWIP_DHCP */

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Type:	Library
Created:	19 Nov 2010
Imports:	44
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

lwip/core/dhcp.c@0:281d6ff68967, 2010-11-19 (annotated)

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