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Darran Shepherd / Mbed 2 deprecated AutoIpNetStack

Net stack with AutoIP enabled

lwip/core/dhcp.c@0:ac21159e27f4, 2010-07-02 (annotated)

Committer:: darran
Date:: Fri Jul 02 17:21:58 2010 +0000
Revision:: 0:ac21159e27f4

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:ac21159e27f4	1	/**
darran	0:ac21159e27f4	2	* @file
darran	0:ac21159e27f4	3	* Dynamic Host Configuration Protocol client
darran	0:ac21159e27f4	4	*
darran	0:ac21159e27f4	5	*/
darran	0:ac21159e27f4	6
darran	0:ac21159e27f4	7	/*
darran	0:ac21159e27f4	8	*
darran	0:ac21159e27f4	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
darran	0:ac21159e27f4	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
darran	0:ac21159e27f4	11	* All rights reserved.
darran	0:ac21159e27f4	12	*
darran	0:ac21159e27f4	13	* Redistribution and use in source and binary forms, with or without modification,
darran	0:ac21159e27f4	14	* are permitted provided that the following conditions are met:
darran	0:ac21159e27f4	15	*
darran	0:ac21159e27f4	16	* 1. Redistributions of source code must retain the above copyright notice,
darran	0:ac21159e27f4	17	* this list of conditions and the following disclaimer.
darran	0:ac21159e27f4	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
darran	0:ac21159e27f4	19	* this list of conditions and the following disclaimer in the documentation
darran	0:ac21159e27f4	20	* and/or other materials provided with the distribution.
darran	0:ac21159e27f4	21	* 3. The name of the author may not be used to endorse or promote products
darran	0:ac21159e27f4	22	* derived from this software without specific prior written permission.
darran	0:ac21159e27f4	23	*
darran	0:ac21159e27f4	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
darran	0:ac21159e27f4	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
darran	0:ac21159e27f4	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
darran	0:ac21159e27f4	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
darran	0:ac21159e27f4	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
darran	0:ac21159e27f4	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
darran	0:ac21159e27f4	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
darran	0:ac21159e27f4	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
darran	0:ac21159e27f4	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
darran	0:ac21159e27f4	33	* OF SUCH DAMAGE.
darran	0:ac21159e27f4	34	*
darran	0:ac21159e27f4	35	* This file is a contribution to the lwIP TCP/IP stack.
darran	0:ac21159e27f4	36	* The Swedish Institute of Computer Science and Adam Dunkels
darran	0:ac21159e27f4	37	* are specifically granted permission to redistribute this
darran	0:ac21159e27f4	38	* source code.
darran	0:ac21159e27f4	39	*
darran	0:ac21159e27f4	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
darran	0:ac21159e27f4	41	*
darran	0:ac21159e27f4	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
darran	0:ac21159e27f4	43	* with RFC 2131 and RFC 2132.
darran	0:ac21159e27f4	44	*
darran	0:ac21159e27f4	45	* TODO:
darran	0:ac21159e27f4	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
darran	0:ac21159e27f4	47	*
darran	0:ac21159e27f4	48	* Please coordinate changes and requests with Leon Woestenberg
darran	0:ac21159e27f4	49	* <leon.woestenberg@gmx.net>
darran	0:ac21159e27f4	50	*
darran	0:ac21159e27f4	51	* Integration with your code:
darran	0:ac21159e27f4	52	*
darran	0:ac21159e27f4	53	* In lwip/dhcp.h
darran	0:ac21159e27f4	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
darran	0:ac21159e27f4	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
darran	0:ac21159e27f4	56	*
darran	0:ac21159e27f4	57	* Then have your application call dhcp_coarse_tmr() and
darran	0:ac21159e27f4	58	* dhcp_fine_tmr() on the defined intervals.
darran	0:ac21159e27f4	59	*
darran	0:ac21159e27f4	60	* dhcp_start(struct netif *netif);
darran	0:ac21159e27f4	61	* starts a DHCP client instance which configures the interface by
darran	0:ac21159e27f4	62	* obtaining an IP address lease and maintaining it.
darran	0:ac21159e27f4	63	*
darran	0:ac21159e27f4	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
darran	0:ac21159e27f4	65	* to remove the DHCP client.
darran	0:ac21159e27f4	66	*
darran	0:ac21159e27f4	67	*/
darran	0:ac21159e27f4	68
darran	0:ac21159e27f4	69	#include "lwip/opt.h"
darran	0:ac21159e27f4	70
darran	0:ac21159e27f4	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
darran	0:ac21159e27f4	72
darran	0:ac21159e27f4	73	#include "lwip/stats.h"
darran	0:ac21159e27f4	74	#include "lwip/mem.h"
darran	0:ac21159e27f4	75	#include "lwip/udp.h"
darran	0:ac21159e27f4	76	#include "lwip/ip_addr.h"
darran	0:ac21159e27f4	77	#include "lwip/netif.h"
darran	0:ac21159e27f4	78	#include "lwip/def.h"
darran	0:ac21159e27f4	79	#include "lwip/sys.h"
darran	0:ac21159e27f4	80	#include "lwip/dhcp.h"
darran	0:ac21159e27f4	81	#include "lwip/autoip.h"
darran	0:ac21159e27f4	82	#include "lwip/dns.h"
darran	0:ac21159e27f4	83	#include "netif/etharp.h"
darran	0:ac21159e27f4	84
darran	0:ac21159e27f4	85	#include <string.h>
darran	0:ac21159e27f4	86
darran	0:ac21159e27f4	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
darran	0:ac21159e27f4	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
darran	0:ac21159e27f4	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
darran	0:ac21159e27f4	90	* #define DHCP_GLOBAL_XID rand()
darran	0:ac21159e27f4	91	*/
darran	0:ac21159e27f4	92	#ifdef DHCP_GLOBAL_XID_HEADER
darran	0:ac21159e27f4	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
darran	0:ac21159e27f4	94	#endif
darran	0:ac21159e27f4	95
darran	0:ac21159e27f4	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
darran	0:ac21159e27f4	97	* MTU is checked to be big enough in dhcp_start */
darran	0:ac21159e27f4	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
darran	0:ac21159e27f4	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
darran	0:ac21159e27f4	100	/** Minimum length for reply before packet is parsed */
darran	0:ac21159e27f4	101	#define DHCP_MIN_REPLY_LEN 44
darran	0:ac21159e27f4	102
darran	0:ac21159e27f4	103	#define REBOOT_TRIES 2
darran	0:ac21159e27f4	104
darran	0:ac21159e27f4	105	/** Option handling: options are parsed in dhcp_parse_reply
darran	0:ac21159e27f4	106	* and saved in an array where other functions can load them from.
darran	0:ac21159e27f4	107	* This might be moved into the struct dhcp (not necessarily since
darran	0:ac21159e27f4	108	* lwIP is single-threaded and the array is only used while in recv
darran	0:ac21159e27f4	109	* callback). */
darran	0:ac21159e27f4	110	#define DHCP_OPTION_IDX_OVERLOAD 0
darran	0:ac21159e27f4	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
darran	0:ac21159e27f4	112	#define DHCP_OPTION_IDX_SERVER_ID 2
darran	0:ac21159e27f4	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
darran	0:ac21159e27f4	114	#define DHCP_OPTION_IDX_T1 4
darran	0:ac21159e27f4	115	#define DHCP_OPTION_IDX_T2 5
darran	0:ac21159e27f4	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
darran	0:ac21159e27f4	117	#define DHCP_OPTION_IDX_ROUTER 7
darran	0:ac21159e27f4	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
darran	0:ac21159e27f4	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
darran	0:ac21159e27f4	120
darran	0:ac21159e27f4	121	/** Holds the decoded option values, only valid while in dhcp_recv.
darran	0:ac21159e27f4	122	@todo: move this into struct dhcp? */
darran	0:ac21159e27f4	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
darran	0:ac21159e27f4	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
darran	0:ac21159e27f4	125	only valid while in dhcp_recv.
darran	0:ac21159e27f4	126	@todo: move this into struct dhcp? */
darran	0:ac21159e27f4	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
darran	0:ac21159e27f4	128
darran	0:ac21159e27f4	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
darran	0:ac21159e27f4	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
darran	0:ac21159e27f4	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
darran	0:ac21159e27f4	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
darran	0:ac21159e27f4	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
darran	0:ac21159e27f4	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
darran	0:ac21159e27f4	135
darran	0:ac21159e27f4	136
darran	0:ac21159e27f4	137	/* DHCP client state machine functions */
darran	0:ac21159e27f4	138	static err_t dhcp_discover(struct netif *netif);
darran	0:ac21159e27f4	139	static err_t dhcp_select(struct netif *netif);
darran	0:ac21159e27f4	140	static void dhcp_bind(struct netif *netif);
darran	0:ac21159e27f4	141	#if DHCP_DOES_ARP_CHECK
darran	0:ac21159e27f4	142	static err_t dhcp_decline(struct netif *netif);
darran	0:ac21159e27f4	143	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:ac21159e27f4	144	static err_t dhcp_rebind(struct netif *netif);
darran	0:ac21159e27f4	145	static err_t dhcp_reboot(struct netif *netif);
darran	0:ac21159e27f4	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
darran	0:ac21159e27f4	147
darran	0:ac21159e27f4	148	/* receive, unfold, parse and free incoming messages */
darran	0:ac21159e27f4	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
darran	0:ac21159e27f4	150
darran	0:ac21159e27f4	151	/* set the DHCP timers */
darran	0:ac21159e27f4	152	static void dhcp_timeout(struct netif *netif);
darran	0:ac21159e27f4	153	static void dhcp_t1_timeout(struct netif *netif);
darran	0:ac21159e27f4	154	static void dhcp_t2_timeout(struct netif *netif);
darran	0:ac21159e27f4	155
darran	0:ac21159e27f4	156	/* build outgoing messages */
darran	0:ac21159e27f4	157	/* create a DHCP message, fill in common headers */
darran	0:ac21159e27f4	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
darran	0:ac21159e27f4	159	/* free a DHCP request */
darran	0:ac21159e27f4	160	static void dhcp_delete_msg(struct dhcp *dhcp);
darran	0:ac21159e27f4	161	/* add a DHCP option (type, then length in bytes) */
darran	0:ac21159e27f4	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
darran	0:ac21159e27f4	163	/* add option values */
darran	0:ac21159e27f4	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
darran	0:ac21159e27f4	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
darran	0:ac21159e27f4	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
darran	0:ac21159e27f4	167	/* always add the DHCP options trailer to end and pad */
darran	0:ac21159e27f4	168	static void dhcp_option_trailer(struct dhcp *dhcp);
darran	0:ac21159e27f4	169
darran	0:ac21159e27f4	170	/**
darran	0:ac21159e27f4	171	* Back-off the DHCP client (because of a received NAK response).
darran	0:ac21159e27f4	172	*
darran	0:ac21159e27f4	173	* Back-off the DHCP client because of a received NAK. Receiving a
darran	0:ac21159e27f4	174	* NAK means the client asked for something non-sensible, for
darran	0:ac21159e27f4	175	* example when it tries to renew a lease obtained on another network.
darran	0:ac21159e27f4	176	*
darran	0:ac21159e27f4	177	* We clear any existing set IP address and restart DHCP negotiation
darran	0:ac21159e27f4	178	* afresh (as per RFC2131 3.2.3).
darran	0:ac21159e27f4	179	*
darran	0:ac21159e27f4	180	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	181	*/
darran	0:ac21159e27f4	182	static void
darran	0:ac21159e27f4	183	dhcp_handle_nak(struct netif *netif)
darran	0:ac21159e27f4	184	{
darran	0:ac21159e27f4	185	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
darran	0:ac21159e27f4	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
darran	0:ac21159e27f4	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
darran	0:ac21159e27f4	189	netif_set_down(netif);
darran	0:ac21159e27f4	190	/* remove IP address from interface */
darran	0:ac21159e27f4	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
darran	0:ac21159e27f4	192	netif_set_gw(netif, IP_ADDR_ANY);
darran	0:ac21159e27f4	193	netif_set_netmask(netif, IP_ADDR_ANY);
darran	0:ac21159e27f4	194	/* Change to a defined state */
darran	0:ac21159e27f4	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
darran	0:ac21159e27f4	196	/* We can immediately restart discovery */
darran	0:ac21159e27f4	197	dhcp_discover(netif);
darran	0:ac21159e27f4	198	}
darran	0:ac21159e27f4	199
darran	0:ac21159e27f4	200	#if DHCP_DOES_ARP_CHECK
darran	0:ac21159e27f4	201	/**
darran	0:ac21159e27f4	202	* Checks if the offered IP address is already in use.
darran	0:ac21159e27f4	203	*
darran	0:ac21159e27f4	204	* It does so by sending an ARP request for the offered address and
darran	0:ac21159e27f4	205	* entering CHECKING state. If no ARP reply is received within a small
darran	0:ac21159e27f4	206	* interval, the address is assumed to be free for use by us.
darran	0:ac21159e27f4	207	*
darran	0:ac21159e27f4	208	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	209	*/
darran	0:ac21159e27f4	210	static void
darran	0:ac21159e27f4	211	dhcp_check(struct netif *netif)
darran	0:ac21159e27f4	212	{
darran	0:ac21159e27f4	213	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	214	err_t result;
darran	0:ac21159e27f4	215	u16_t msecs;
darran	0:ac21159e27f4	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
darran	0:ac21159e27f4	217	(s16_t)netif->name[1]));
darran	0:ac21159e27f4	218	dhcp_set_state(dhcp, DHCP_CHECKING);
darran	0:ac21159e27f4	219	/* create an ARP query for the offered IP address, expecting that no host
darran	0:ac21159e27f4	220	responds, as the IP address should not be in use. */
darran	0:ac21159e27f4	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
darran	0:ac21159e27f4	222	if (result != ERR_OK) {
darran	0:ac21159e27f4	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
darran	0:ac21159e27f4	224	}
darran	0:ac21159e27f4	225	dhcp->tries++;
darran	0:ac21159e27f4	226	msecs = 500;
darran	0:ac21159e27f4	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	229	}
darran	0:ac21159e27f4	230	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:ac21159e27f4	231
darran	0:ac21159e27f4	232	/**
darran	0:ac21159e27f4	233	* Remember the configuration offered by a DHCP server.
darran	0:ac21159e27f4	234	*
darran	0:ac21159e27f4	235	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	236	*/
darran	0:ac21159e27f4	237	static void
darran	0:ac21159e27f4	238	dhcp_handle_offer(struct netif *netif)
darran	0:ac21159e27f4	239	{
darran	0:ac21159e27f4	240	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
darran	0:ac21159e27f4	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
darran	0:ac21159e27f4	243	/* obtain the server address */
darran	0:ac21159e27f4	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
darran	0:ac21159e27f4	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
darran	0:ac21159e27f4	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
darran	0:ac21159e27f4	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
darran	0:ac21159e27f4	248	/* remember offered address */
darran	0:ac21159e27f4	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
darran	0:ac21159e27f4	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
darran	0:ac21159e27f4	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:ac21159e27f4	252
darran	0:ac21159e27f4	253	dhcp_select(netif);
darran	0:ac21159e27f4	254	} else {
darran	0:ac21159e27f4	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:ac21159e27f4	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
darran	0:ac21159e27f4	257	}
darran	0:ac21159e27f4	258	}
darran	0:ac21159e27f4	259
darran	0:ac21159e27f4	260	/**
darran	0:ac21159e27f4	261	* Select a DHCP server offer out of all offers.
darran	0:ac21159e27f4	262	*
darran	0:ac21159e27f4	263	* Simply select the first offer received.
darran	0:ac21159e27f4	264	*
darran	0:ac21159e27f4	265	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	266	* @return lwIP specific error (see error.h)
darran	0:ac21159e27f4	267	*/
darran	0:ac21159e27f4	268	static err_t
darran	0:ac21159e27f4	269	dhcp_select(struct netif *netif)
darran	0:ac21159e27f4	270	{
darran	0:ac21159e27f4	271	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	272	err_t result;
darran	0:ac21159e27f4	273	u16_t msecs;
darran	0:ac21159e27f4	274
darran	0:ac21159e27f4	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));
darran	0:ac21159e27f4	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
darran	0:ac21159e27f4	277
darran	0:ac21159e27f4	278	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:ac21159e27f4	280	if (result == ERR_OK) {
darran	0:ac21159e27f4	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:ac21159e27f4	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:ac21159e27f4	283
darran	0:ac21159e27f4	284	/* MUST request the offered IP address */
darran	0:ac21159e27f4	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:ac21159e27f4	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:ac21159e27f4	287
darran	0:ac21159e27f4	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
darran	0:ac21159e27f4	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
darran	0:ac21159e27f4	290
darran	0:ac21159e27f4	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
darran	0:ac21159e27f4	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
darran	0:ac21159e27f4	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
darran	0:ac21159e27f4	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
darran	0:ac21159e27f4	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
darran	0:ac21159e27f4	296
darran	0:ac21159e27f4	297	#if LWIP_NETIF_HOSTNAME
darran	0:ac21159e27f4	298	if (netif->hostname != NULL) {
darran	0:ac21159e27f4	299	const char p = (const char)netif->hostname;
darran	0:ac21159e27f4	300	u8_t namelen = (u8_t)strlen(p);
darran	0:ac21159e27f4	301	if (namelen > 0) {
darran	0:ac21159e27f4	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
darran	0:ac21159e27f4	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
darran	0:ac21159e27f4	304	while (*p) {
darran	0:ac21159e27f4	305	dhcp_option_byte(dhcp, *p++);
darran	0:ac21159e27f4	306	}
darran	0:ac21159e27f4	307	}
darran	0:ac21159e27f4	308	}
darran	0:ac21159e27f4	309	#endif /* LWIP_NETIF_HOSTNAME */
darran	0:ac21159e27f4	310
darran	0:ac21159e27f4	311	dhcp_option_trailer(dhcp);
darran	0:ac21159e27f4	312	/* shrink the pbuf to the actual content length */
darran	0:ac21159e27f4	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:ac21159e27f4	314
darran	0:ac21159e27f4	315	/* send broadcast to any DHCP server */
darran	0:ac21159e27f4	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	317	dhcp_delete_msg(dhcp);
darran	0:ac21159e27f4	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
darran	0:ac21159e27f4	319	} else {
darran	0:ac21159e27f4	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	321	}
darran	0:ac21159e27f4	322	dhcp->tries++;
darran	0:ac21159e27f4	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
darran	0:ac21159e27f4	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	326	return result;
darran	0:ac21159e27f4	327	}
darran	0:ac21159e27f4	328
darran	0:ac21159e27f4	329	/**
darran	0:ac21159e27f4	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
darran	0:ac21159e27f4	331	*/
darran	0:ac21159e27f4	332	void
darran	0:ac21159e27f4	333	dhcp_coarse_tmr()
darran	0:ac21159e27f4	334	{
darran	0:ac21159e27f4	335	struct netif *netif = netif_list;
darran	0:ac21159e27f4	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
darran	0:ac21159e27f4	337	/* iterate through all network interfaces */
darran	0:ac21159e27f4	338	while (netif != NULL) {
darran	0:ac21159e27f4	339	/* only act on DHCP configured interfaces */
darran	0:ac21159e27f4	340	if (netif->dhcp != NULL) {
darran	0:ac21159e27f4	341	/* timer is active (non zero), and triggers (zeroes) now? */
darran	0:ac21159e27f4	342	if (netif->dhcp->t2_timeout-- == 1) {
darran	0:ac21159e27f4	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
darran	0:ac21159e27f4	344	/* this clients' rebind timeout triggered */
darran	0:ac21159e27f4	345	dhcp_t2_timeout(netif);
darran	0:ac21159e27f4	346	/* timer is active (non zero), and triggers (zeroes) now */
darran	0:ac21159e27f4	347	} else if (netif->dhcp->t1_timeout-- == 1) {
darran	0:ac21159e27f4	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
darran	0:ac21159e27f4	349	/* this clients' renewal timeout triggered */
darran	0:ac21159e27f4	350	dhcp_t1_timeout(netif);
darran	0:ac21159e27f4	351	}
darran	0:ac21159e27f4	352	}
darran	0:ac21159e27f4	353	/* proceed to next netif */
darran	0:ac21159e27f4	354	netif = netif->next;
darran	0:ac21159e27f4	355	}
darran	0:ac21159e27f4	356	}
darran	0:ac21159e27f4	357
darran	0:ac21159e27f4	358	/**
darran	0:ac21159e27f4	359	* DHCP transaction timeout handling
darran	0:ac21159e27f4	360	*
darran	0:ac21159e27f4	361	* A DHCP server is expected to respond within a short period of time.
darran	0:ac21159e27f4	362	* This timer checks whether an outstanding DHCP request is timed out.
darran	0:ac21159e27f4	363	*/
darran	0:ac21159e27f4	364	void
darran	0:ac21159e27f4	365	dhcp_fine_tmr()
darran	0:ac21159e27f4	366	{
darran	0:ac21159e27f4	367	struct netif *netif = netif_list;
darran	0:ac21159e27f4	368	/* loop through netif's */
darran	0:ac21159e27f4	369	while (netif != NULL) {
darran	0:ac21159e27f4	370	/* only act on DHCP configured interfaces */
darran	0:ac21159e27f4	371	if (netif->dhcp != NULL) {
darran	0:ac21159e27f4	372	/* timer is active (non zero), and is about to trigger now */
darran	0:ac21159e27f4	373	if (netif->dhcp->request_timeout > 1) {
darran	0:ac21159e27f4	374	netif->dhcp->request_timeout--;
darran	0:ac21159e27f4	375	}
darran	0:ac21159e27f4	376	else if (netif->dhcp->request_timeout == 1) {
darran	0:ac21159e27f4	377	netif->dhcp->request_timeout--;
darran	0:ac21159e27f4	378	/* { netif->dhcp->request_timeout == 0 } */
darran	0:ac21159e27f4	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
darran	0:ac21159e27f4	380	/* this client's request timeout triggered */
darran	0:ac21159e27f4	381	dhcp_timeout(netif);
darran	0:ac21159e27f4	382	}
darran	0:ac21159e27f4	383	}
darran	0:ac21159e27f4	384	/* proceed to next network interface */
darran	0:ac21159e27f4	385	netif = netif->next;
darran	0:ac21159e27f4	386	}
darran	0:ac21159e27f4	387	}
darran	0:ac21159e27f4	388
darran	0:ac21159e27f4	389	/**
darran	0:ac21159e27f4	390	* A DHCP negotiation transaction, or ARP request, has timed out.
darran	0:ac21159e27f4	391	*
darran	0:ac21159e27f4	392	* The timer that was started with the DHCP or ARP request has
darran	0:ac21159e27f4	393	* timed out, indicating no response was received in time.
darran	0:ac21159e27f4	394	*
darran	0:ac21159e27f4	395	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	396	*/
darran	0:ac21159e27f4	397	static void
darran	0:ac21159e27f4	398	dhcp_timeout(struct netif *netif)
darran	0:ac21159e27f4	399	{
darran	0:ac21159e27f4	400	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
darran	0:ac21159e27f4	402	/* back-off period has passed, or server selection timed out */
darran	0:ac21159e27f4	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
darran	0:ac21159e27f4	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
darran	0:ac21159e27f4	405	dhcp_discover(netif);
darran	0:ac21159e27f4	406	/* receiving the requested lease timed out */
darran	0:ac21159e27f4	407	} else if (dhcp->state == DHCP_REQUESTING) {
darran	0:ac21159e27f4	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
darran	0:ac21159e27f4	409	if (dhcp->tries <= 5) {
darran	0:ac21159e27f4	410	dhcp_select(netif);
darran	0:ac21159e27f4	411	} else {
darran	0:ac21159e27f4	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
darran	0:ac21159e27f4	413	dhcp_release(netif);
darran	0:ac21159e27f4	414	dhcp_discover(netif);
darran	0:ac21159e27f4	415	}
darran	0:ac21159e27f4	416	#if DHCP_DOES_ARP_CHECK
darran	0:ac21159e27f4	417	/* received no ARP reply for the offered address (which is good) */
darran	0:ac21159e27f4	418	} else if (dhcp->state == DHCP_CHECKING) {
darran	0:ac21159e27f4	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
darran	0:ac21159e27f4	420	if (dhcp->tries <= 1) {
darran	0:ac21159e27f4	421	dhcp_check(netif);
darran	0:ac21159e27f4	422	/* no ARP replies on the offered address,
darran	0:ac21159e27f4	423	looks like the IP address is indeed free */
darran	0:ac21159e27f4	424	} else {
darran	0:ac21159e27f4	425	/* bind the interface to the offered address */
darran	0:ac21159e27f4	426	dhcp_bind(netif);
darran	0:ac21159e27f4	427	}
darran	0:ac21159e27f4	428	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:ac21159e27f4	429	}
darran	0:ac21159e27f4	430	/* did not get response to renew request? */
darran	0:ac21159e27f4	431	else if (dhcp->state == DHCP_RENEWING) {
darran	0:ac21159e27f4	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
darran	0:ac21159e27f4	433	/* just retry renewal */
darran	0:ac21159e27f4	434	/* note that the rebind timer will eventually time-out if renew does not work */
darran	0:ac21159e27f4	435	dhcp_renew(netif);
darran	0:ac21159e27f4	436	/* did not get response to rebind request? */
darran	0:ac21159e27f4	437	} else if (dhcp->state == DHCP_REBINDING) {
darran	0:ac21159e27f4	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
darran	0:ac21159e27f4	439	if (dhcp->tries <= 8) {
darran	0:ac21159e27f4	440	dhcp_rebind(netif);
darran	0:ac21159e27f4	441	} else {
darran	0:ac21159e27f4	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
darran	0:ac21159e27f4	443	dhcp_release(netif);
darran	0:ac21159e27f4	444	dhcp_discover(netif);
darran	0:ac21159e27f4	445	}
darran	0:ac21159e27f4	446	} else if (dhcp->state == DHCP_REBOOTING) {
darran	0:ac21159e27f4	447	if (dhcp->tries < REBOOT_TRIES) {
darran	0:ac21159e27f4	448	dhcp_reboot(netif);
darran	0:ac21159e27f4	449	} else {
darran	0:ac21159e27f4	450	dhcp_discover(netif);
darran	0:ac21159e27f4	451	}
darran	0:ac21159e27f4	452	}
darran	0:ac21159e27f4	453	}
darran	0:ac21159e27f4	454
darran	0:ac21159e27f4	455	/**
darran	0:ac21159e27f4	456	* The renewal period has timed out.
darran	0:ac21159e27f4	457	*
darran	0:ac21159e27f4	458	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	459	*/
darran	0:ac21159e27f4	460	static void
darran	0:ac21159e27f4	461	dhcp_t1_timeout(struct netif *netif)
darran	0:ac21159e27f4	462	{
darran	0:ac21159e27f4	463	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
darran	0:ac21159e27f4	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
darran	0:ac21159e27f4	466	(dhcp->state == DHCP_RENEWING)) {
darran	0:ac21159e27f4	467	/* just retry to renew - note that the rebind timer (t2) will
darran	0:ac21159e27f4	468	* eventually time-out if renew tries fail. */
darran	0:ac21159e27f4	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:ac21159e27f4	470	("dhcp_t1_timeout(): must renew\n"));
darran	0:ac21159e27f4	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
darran	0:ac21159e27f4	472	DHCP_RENEWING, not DHCP_BOUND */
darran	0:ac21159e27f4	473	dhcp_renew(netif);
darran	0:ac21159e27f4	474	}
darran	0:ac21159e27f4	475	}
darran	0:ac21159e27f4	476
darran	0:ac21159e27f4	477	/**
darran	0:ac21159e27f4	478	* The rebind period has timed out.
darran	0:ac21159e27f4	479	*
darran	0:ac21159e27f4	480	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	481	*/
darran	0:ac21159e27f4	482	static void
darran	0:ac21159e27f4	483	dhcp_t2_timeout(struct netif *netif)
darran	0:ac21159e27f4	484	{
darran	0:ac21159e27f4	485	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
darran	0:ac21159e27f4	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
darran	0:ac21159e27f4	488	(dhcp->state == DHCP_RENEWING)) {
darran	0:ac21159e27f4	489	/* just retry to rebind */
darran	0:ac21159e27f4	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:ac21159e27f4	491	("dhcp_t2_timeout(): must rebind\n"));
darran	0:ac21159e27f4	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
darran	0:ac21159e27f4	493	DHCP_REBINDING, not DHCP_BOUND */
darran	0:ac21159e27f4	494	dhcp_rebind(netif);
darran	0:ac21159e27f4	495	}
darran	0:ac21159e27f4	496	}
darran	0:ac21159e27f4	497
darran	0:ac21159e27f4	498	/**
darran	0:ac21159e27f4	499	* Handle a DHCP ACK packet
darran	0:ac21159e27f4	500	*
darran	0:ac21159e27f4	501	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	502	*/
darran	0:ac21159e27f4	503	static void
darran	0:ac21159e27f4	504	dhcp_handle_ack(struct netif *netif)
darran	0:ac21159e27f4	505	{
darran	0:ac21159e27f4	506	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	507	#if LWIP_DNS
darran	0:ac21159e27f4	508	u8_t n;
darran	0:ac21159e27f4	509	#endif /* LWIP_DNS */
darran	0:ac21159e27f4	510
darran	0:ac21159e27f4	511	/* clear options we might not get from the ACK */
darran	0:ac21159e27f4	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
darran	0:ac21159e27f4	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
darran	0:ac21159e27f4	514	#if LWIP_DHCP_BOOTP_FILE
darran	0:ac21159e27f4	515	ip_addr_set_zero(&dhcp->offered_si_addr);
darran	0:ac21159e27f4	516	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:ac21159e27f4	517
darran	0:ac21159e27f4	518	/* lease time given? */
darran	0:ac21159e27f4	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
darran	0:ac21159e27f4	520	/* remember offered lease time */
darran	0:ac21159e27f4	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
darran	0:ac21159e27f4	522	}
darran	0:ac21159e27f4	523	/* renewal period given? */
darran	0:ac21159e27f4	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
darran	0:ac21159e27f4	525	/* remember given renewal period */
darran	0:ac21159e27f4	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
darran	0:ac21159e27f4	527	} else {
darran	0:ac21159e27f4	528	/* calculate safe periods for renewal */
darran	0:ac21159e27f4	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
darran	0:ac21159e27f4	530	}
darran	0:ac21159e27f4	531
darran	0:ac21159e27f4	532	/* renewal period given? */
darran	0:ac21159e27f4	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
darran	0:ac21159e27f4	534	/* remember given rebind period */
darran	0:ac21159e27f4	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
darran	0:ac21159e27f4	536	} else {
darran	0:ac21159e27f4	537	/* calculate safe periods for rebinding */
darran	0:ac21159e27f4	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
darran	0:ac21159e27f4	539	}
darran	0:ac21159e27f4	540
darran	0:ac21159e27f4	541	/* (y)our internet address */
darran	0:ac21159e27f4	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
darran	0:ac21159e27f4	543
darran	0:ac21159e27f4	544	#if LWIP_DHCP_BOOTP_FILE
darran	0:ac21159e27f4	545	/* copy boot server address,
darran	0:ac21159e27f4	546	boot file name copied in dhcp_parse_reply if not overloaded */
darran	0:ac21159e27f4	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
darran	0:ac21159e27f4	548	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:ac21159e27f4	549
darran	0:ac21159e27f4	550	/* subnet mask given? */
darran	0:ac21159e27f4	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
darran	0:ac21159e27f4	552	/* remember given subnet mask */
darran	0:ac21159e27f4	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
darran	0:ac21159e27f4	554	dhcp->subnet_mask_given = 1;
darran	0:ac21159e27f4	555	} else {
darran	0:ac21159e27f4	556	dhcp->subnet_mask_given = 0;
darran	0:ac21159e27f4	557	}
darran	0:ac21159e27f4	558
darran	0:ac21159e27f4	559	/* gateway router */
darran	0:ac21159e27f4	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
darran	0:ac21159e27f4	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
darran	0:ac21159e27f4	562	}
darran	0:ac21159e27f4	563
darran	0:ac21159e27f4	564	#if LWIP_DNS
darran	0:ac21159e27f4	565	/* DNS servers */
darran	0:ac21159e27f4	566	n = 0;
darran	0:ac21159e27f4	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
darran	0:ac21159e27f4	568	ip_addr_t dns_addr;
darran	0:ac21159e27f4	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
darran	0:ac21159e27f4	570	dns_setserver(n, &dns_addr);
darran	0:ac21159e27f4	571	n++;
darran	0:ac21159e27f4	572	}
darran	0:ac21159e27f4	573	#endif /* LWIP_DNS */
darran	0:ac21159e27f4	574	}
darran	0:ac21159e27f4	575
darran	0:ac21159e27f4	576	/** Set a statically allocated struct dhcp to work with.
darran	0:ac21159e27f4	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
darran	0:ac21159e27f4	578	*
darran	0:ac21159e27f4	579	* @param netif the netif for which to set the struct dhcp
darran	0:ac21159e27f4	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
darran	0:ac21159e27f4	581	*/
darran	0:ac21159e27f4	582	void
darran	0:ac21159e27f4	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
darran	0:ac21159e27f4	584	{
darran	0:ac21159e27f4	585	LWIP_ASSERT("netif != NULL", netif != NULL);
darran	0:ac21159e27f4	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
darran	0:ac21159e27f4	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
darran	0:ac21159e27f4	588
darran	0:ac21159e27f4	589	/* clear data structure */
darran	0:ac21159e27f4	590	memset(dhcp, 0, sizeof(struct dhcp));
darran	0:ac21159e27f4	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
darran	0:ac21159e27f4	592	netif->dhcp = dhcp;
darran	0:ac21159e27f4	593	}
darran	0:ac21159e27f4	594
darran	0:ac21159e27f4	595	/**
darran	0:ac21159e27f4	596	* Start DHCP negotiation for a network interface.
darran	0:ac21159e27f4	597	*
darran	0:ac21159e27f4	598	* If no DHCP client instance was attached to this interface,
darran	0:ac21159e27f4	599	* a new client is created first. If a DHCP client instance
darran	0:ac21159e27f4	600	* was already present, it restarts negotiation.
darran	0:ac21159e27f4	601	*
darran	0:ac21159e27f4	602	* @param netif The lwIP network interface
darran	0:ac21159e27f4	603	* @return lwIP error code
darran	0:ac21159e27f4	604	* - ERR_OK - No error
darran	0:ac21159e27f4	605	* - ERR_MEM - Out of memory
darran	0:ac21159e27f4	606	*/
darran	0:ac21159e27f4	607	err_t
darran	0:ac21159e27f4	608	dhcp_start(struct netif *netif)
darran	0:ac21159e27f4	609	{
darran	0:ac21159e27f4	610	struct dhcp *dhcp;
darran	0:ac21159e27f4	611	err_t result = ERR_OK;
darran	0:ac21159e27f4	612
darran	0:ac21159e27f4	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
darran	0:ac21159e27f4	614	dhcp = netif->dhcp;
darran	0:ac21159e27f4	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));
darran	0:ac21159e27f4	616	/* Remove the flag that says this netif is handled by DHCP,
darran	0:ac21159e27f4	617	it is set when we succeeded starting. */
darran	0:ac21159e27f4	618	netif->flags &= ~NETIF_FLAG_DHCP;
darran	0:ac21159e27f4	619
darran	0:ac21159e27f4	620	/* check hwtype of the netif */
darran	0:ac21159e27f4	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
darran	0:ac21159e27f4	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
darran	0:ac21159e27f4	623	return ERR_ARG;
darran	0:ac21159e27f4	624	}
darran	0:ac21159e27f4	625
darran	0:ac21159e27f4	626	/* check MTU of the netif */
darran	0:ac21159e27f4	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
darran	0:ac21159e27f4	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
darran	0:ac21159e27f4	629	return ERR_MEM;
darran	0:ac21159e27f4	630	}
darran	0:ac21159e27f4	631
darran	0:ac21159e27f4	632	/* no DHCP client attached yet? */
darran	0:ac21159e27f4	633	if (dhcp == NULL) {
darran	0:ac21159e27f4	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
darran	0:ac21159e27f4	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
darran	0:ac21159e27f4	636	if (dhcp == NULL) {
darran	0:ac21159e27f4	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
darran	0:ac21159e27f4	638	return ERR_MEM;
darran	0:ac21159e27f4	639	}
darran	0:ac21159e27f4	640	/* store this dhcp client in the netif */
darran	0:ac21159e27f4	641	netif->dhcp = dhcp;
darran	0:ac21159e27f4	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
darran	0:ac21159e27f4	643	/* already has DHCP client attached */
darran	0:ac21159e27f4	644	} else {
darran	0:ac21159e27f4	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
darran	0:ac21159e27f4	646	if (dhcp->pcb != NULL) {
darran	0:ac21159e27f4	647	udp_remove(dhcp->pcb);
darran	0:ac21159e27f4	648	}
darran	0:ac21159e27f4	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
darran	0:ac21159e27f4	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
darran	0:ac21159e27f4	651	}
darran	0:ac21159e27f4	652
darran	0:ac21159e27f4	653	/* clear data structure */
darran	0:ac21159e27f4	654	memset(dhcp, 0, sizeof(struct dhcp));
darran	0:ac21159e27f4	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
darran	0:ac21159e27f4	656	/* allocate UDP PCB */
darran	0:ac21159e27f4	657	dhcp->pcb = udp_new();
darran	0:ac21159e27f4	658	if (dhcp->pcb == NULL) {
darran	0:ac21159e27f4	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
darran	0:ac21159e27f4	660	return ERR_MEM;
darran	0:ac21159e27f4	661	}
darran	0:ac21159e27f4	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
darran	0:ac21159e27f4	663	/* set up local and remote port for the pcb */
darran	0:ac21159e27f4	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
darran	0:ac21159e27f4	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
darran	0:ac21159e27f4	666	/* set up the recv callback and argument */
darran	0:ac21159e27f4	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
darran	0:ac21159e27f4	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
darran	0:ac21159e27f4	669	/* (re)start the DHCP negotiation */
darran	0:ac21159e27f4	670	result = dhcp_discover(netif);
darran	0:ac21159e27f4	671	if (result != ERR_OK) {
darran	0:ac21159e27f4	672	/* free resources allocated above */
darran	0:ac21159e27f4	673	dhcp_stop(netif);
darran	0:ac21159e27f4	674	return ERR_MEM;
darran	0:ac21159e27f4	675	}
darran	0:ac21159e27f4	676	/* Set the flag that says this netif is handled by DHCP. */
darran	0:ac21159e27f4	677	netif->flags \|= NETIF_FLAG_DHCP;
darran	0:ac21159e27f4	678	return result;
darran	0:ac21159e27f4	679	}
darran	0:ac21159e27f4	680
darran	0:ac21159e27f4	681	/**
darran	0:ac21159e27f4	682	* Inform a DHCP server of our manual configuration.
darran	0:ac21159e27f4	683	*
darran	0:ac21159e27f4	684	* This informs DHCP servers of our fixed IP address configuration
darran	0:ac21159e27f4	685	* by sending an INFORM message. It does not involve DHCP address
darran	0:ac21159e27f4	686	* configuration, it is just here to be nice to the network.
darran	0:ac21159e27f4	687	*
darran	0:ac21159e27f4	688	* @param netif The lwIP network interface
darran	0:ac21159e27f4	689	*/
darran	0:ac21159e27f4	690	void
darran	0:ac21159e27f4	691	dhcp_inform(struct netif *netif)
darran	0:ac21159e27f4	692	{
darran	0:ac21159e27f4	693	struct dhcp dhcp;
darran	0:ac21159e27f4	694	err_t result = ERR_OK;
darran	0:ac21159e27f4	695	struct udp_pcb *pcb;
darran	0:ac21159e27f4	696
darran	0:ac21159e27f4	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
darran	0:ac21159e27f4	698
darran	0:ac21159e27f4	699	memset(&dhcp, 0, sizeof(struct dhcp));
darran	0:ac21159e27f4	700	dhcp_set_state(&dhcp, DHCP_INFORM);
darran	0:ac21159e27f4	701
darran	0:ac21159e27f4	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
darran	0:ac21159e27f4	703	/* re-use existing pcb */
darran	0:ac21159e27f4	704	pcb = netif->dhcp->pcb;
darran	0:ac21159e27f4	705	} else {
darran	0:ac21159e27f4	706	pcb = udp_new();
darran	0:ac21159e27f4	707	if (pcb == NULL) {
darran	0:ac21159e27f4	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
darran	0:ac21159e27f4	709	return;
darran	0:ac21159e27f4	710	}
darran	0:ac21159e27f4	711	dhcp.pcb = pcb;
darran	0:ac21159e27f4	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
darran	0:ac21159e27f4	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
darran	0:ac21159e27f4	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
darran	0:ac21159e27f4	715	}
darran	0:ac21159e27f4	716	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
darran	0:ac21159e27f4	718	if (result == ERR_OK) {
darran	0:ac21159e27f4	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:ac21159e27f4	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:ac21159e27f4	721
darran	0:ac21159e27f4	722	dhcp_option_trailer(&dhcp);
darran	0:ac21159e27f4	723
darran	0:ac21159e27f4	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
darran	0:ac21159e27f4	725
darran	0:ac21159e27f4	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
darran	0:ac21159e27f4	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	728	dhcp_delete_msg(&dhcp);
darran	0:ac21159e27f4	729	} else {
darran	0:ac21159e27f4	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	731	}
darran	0:ac21159e27f4	732
darran	0:ac21159e27f4	733	if (dhcp.pcb != NULL) {
darran	0:ac21159e27f4	734	/* otherwise, the existing pcb was used */
darran	0:ac21159e27f4	735	udp_remove(dhcp.pcb);
darran	0:ac21159e27f4	736	}
darran	0:ac21159e27f4	737	}
darran	0:ac21159e27f4	738
darran	0:ac21159e27f4	739	/** Handle a possible change in the network configuration.
darran	0:ac21159e27f4	740	*
darran	0:ac21159e27f4	741	* This enters the REBOOTING state to verify that the currently bound
darran	0:ac21159e27f4	742	* address is still valid.
darran	0:ac21159e27f4	743	*/
darran	0:ac21159e27f4	744	void
darran	0:ac21159e27f4	745	dhcp_network_changed(struct netif *netif)
darran	0:ac21159e27f4	746	{
darran	0:ac21159e27f4	747	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	748	if (!dhcp)
darran	0:ac21159e27f4	749	return;
darran	0:ac21159e27f4	750	switch (dhcp->state) {
darran	0:ac21159e27f4	751	case DHCP_REBINDING:
darran	0:ac21159e27f4	752	case DHCP_RENEWING:
darran	0:ac21159e27f4	753	case DHCP_BOUND:
darran	0:ac21159e27f4	754	case DHCP_REBOOTING:
darran	0:ac21159e27f4	755	netif_set_down(netif);
darran	0:ac21159e27f4	756	dhcp->tries = 0;
darran	0:ac21159e27f4	757	dhcp_reboot(netif);
darran	0:ac21159e27f4	758	break;
darran	0:ac21159e27f4	759	case DHCP_OFF:
darran	0:ac21159e27f4	760	/* stay off */
darran	0:ac21159e27f4	761	break;
darran	0:ac21159e27f4	762	default:
darran	0:ac21159e27f4	763	dhcp->tries = 0;
darran	0:ac21159e27f4	764	dhcp_discover(netif);
darran	0:ac21159e27f4	765	break;
darran	0:ac21159e27f4	766	}
darran	0:ac21159e27f4	767	}
darran	0:ac21159e27f4	768
darran	0:ac21159e27f4	769	#if DHCP_DOES_ARP_CHECK
darran	0:ac21159e27f4	770	/**
darran	0:ac21159e27f4	771	* Match an ARP reply with the offered IP address.
darran	0:ac21159e27f4	772	*
darran	0:ac21159e27f4	773	* @param netif the network interface on which the reply was received
darran	0:ac21159e27f4	774	* @param addr The IP address we received a reply from
darran	0:ac21159e27f4	775	*/
darran	0:ac21159e27f4	776	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
darran	0:ac21159e27f4	777	{
darran	0:ac21159e27f4	778	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
darran	0:ac21159e27f4	779	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
darran	0:ac21159e27f4	780	/* is a DHCP client doing an ARP check? */
darran	0:ac21159e27f4	781	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
darran	0:ac21159e27f4	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
darran	0:ac21159e27f4	783	ip4_addr_get_u32(addr)));
darran	0:ac21159e27f4	784	/* did a host respond with the address we
darran	0:ac21159e27f4	785	were offered by the DHCP server? */
darran	0:ac21159e27f4	786	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
darran	0:ac21159e27f4	787	/* we will not accept the offered address */
darran	0:ac21159e27f4	788	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
darran	0:ac21159e27f4	789	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
darran	0:ac21159e27f4	790	dhcp_decline(netif);
darran	0:ac21159e27f4	791	}
darran	0:ac21159e27f4	792	}
darran	0:ac21159e27f4	793	}
darran	0:ac21159e27f4	794
darran	0:ac21159e27f4	795	/**
darran	0:ac21159e27f4	796	* Decline an offered lease.
darran	0:ac21159e27f4	797	*
darran	0:ac21159e27f4	798	* Tell the DHCP server we do not accept the offered address.
darran	0:ac21159e27f4	799	* One reason to decline the lease is when we find out the address
darran	0:ac21159e27f4	800	* is already in use by another host (through ARP).
darran	0:ac21159e27f4	801	*
darran	0:ac21159e27f4	802	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	803	*/
darran	0:ac21159e27f4	804	static err_t
darran	0:ac21159e27f4	805	dhcp_decline(struct netif *netif)
darran	0:ac21159e27f4	806	{
darran	0:ac21159e27f4	807	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	808	err_t result = ERR_OK;
darran	0:ac21159e27f4	809	u16_t msecs;
darran	0:ac21159e27f4	810	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
darran	0:ac21159e27f4	811	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
darran	0:ac21159e27f4	812	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	813	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
darran	0:ac21159e27f4	814	if (result == ERR_OK) {
darran	0:ac21159e27f4	815	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:ac21159e27f4	816	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:ac21159e27f4	817
darran	0:ac21159e27f4	818	dhcp_option_trailer(dhcp);
darran	0:ac21159e27f4	819	/* resize pbuf to reflect true size of options */
darran	0:ac21159e27f4	820	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:ac21159e27f4	821
darran	0:ac21159e27f4	822	/* per section 4.4.4, broadcast DECLINE messages */
darran	0:ac21159e27f4	823	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	824	dhcp_delete_msg(dhcp);
darran	0:ac21159e27f4	825	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
darran	0:ac21159e27f4	826	} else {
darran	0:ac21159e27f4	827	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:ac21159e27f4	828	("dhcp_decline: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	829	}
darran	0:ac21159e27f4	830	dhcp->tries++;
darran	0:ac21159e27f4	831	msecs = 10*1000;
darran	0:ac21159e27f4	832	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	833	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	834	return result;
darran	0:ac21159e27f4	835	}
darran	0:ac21159e27f4	836	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:ac21159e27f4	837
darran	0:ac21159e27f4	838
darran	0:ac21159e27f4	839	/**
darran	0:ac21159e27f4	840	* Start the DHCP process, discover a DHCP server.
darran	0:ac21159e27f4	841	*
darran	0:ac21159e27f4	842	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	843	*/
darran	0:ac21159e27f4	844	static err_t
darran	0:ac21159e27f4	845	dhcp_discover(struct netif *netif)
darran	0:ac21159e27f4	846	{
darran	0:ac21159e27f4	847	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	848	err_t result = ERR_OK;
darran	0:ac21159e27f4	849	u16_t msecs;
darran	0:ac21159e27f4	850	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
darran	0:ac21159e27f4	851	ip_addr_set_any(&dhcp->offered_ip_addr);
darran	0:ac21159e27f4	852	dhcp_set_state(dhcp, DHCP_SELECTING);
darran	0:ac21159e27f4	853	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	854	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
darran	0:ac21159e27f4	855	if (result == ERR_OK) {
darran	0:ac21159e27f4	856	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
darran	0:ac21159e27f4	857
darran	0:ac21159e27f4	858	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:ac21159e27f4	859	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:ac21159e27f4	860
darran	0:ac21159e27f4	861	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
darran	0:ac21159e27f4	862	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
darran	0:ac21159e27f4	863	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
darran	0:ac21159e27f4	864	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
darran	0:ac21159e27f4	865	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
darran	0:ac21159e27f4	866
darran	0:ac21159e27f4	867	dhcp_option_trailer(dhcp);
darran	0:ac21159e27f4	868
darran	0:ac21159e27f4	869	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
darran	0:ac21159e27f4	870	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:ac21159e27f4	871
darran	0:ac21159e27f4	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
darran	0:ac21159e27f4	873	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	874	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
darran	0:ac21159e27f4	875	dhcp_delete_msg(dhcp);
darran	0:ac21159e27f4	876	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
darran	0:ac21159e27f4	877	} else {
darran	0:ac21159e27f4	878	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	879	}
darran	0:ac21159e27f4	880	dhcp->tries++;
darran	0:ac21159e27f4	881	#if LWIP_DHCP_AUTOIP_COOP
darran	0:ac21159e27f4	882	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
darran	0:ac21159e27f4	883	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
darran	0:ac21159e27f4	884	autoip_start(netif);
darran	0:ac21159e27f4	885	}
darran	0:ac21159e27f4	886	#endif /* LWIP_DHCP_AUTOIP_COOP */
darran	0:ac21159e27f4	887	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
darran	0:ac21159e27f4	888	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	889	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	890	return result;
darran	0:ac21159e27f4	891	}
darran	0:ac21159e27f4	892
darran	0:ac21159e27f4	893
darran	0:ac21159e27f4	894	/**
darran	0:ac21159e27f4	895	* Bind the interface to the offered IP address.
darran	0:ac21159e27f4	896	*
darran	0:ac21159e27f4	897	* @param netif network interface to bind to the offered address
darran	0:ac21159e27f4	898	*/
darran	0:ac21159e27f4	899	static void
darran	0:ac21159e27f4	900	dhcp_bind(struct netif *netif)
darran	0:ac21159e27f4	901	{
darran	0:ac21159e27f4	902	u32_t timeout;
darran	0:ac21159e27f4	903	struct dhcp *dhcp;
darran	0:ac21159e27f4	904	ip_addr_t sn_mask, gw_addr;
darran	0:ac21159e27f4	905	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
darran	0:ac21159e27f4	906	dhcp = netif->dhcp;
darran	0:ac21159e27f4	907	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
darran	0:ac21159e27f4	908	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));
darran	0:ac21159e27f4	909
darran	0:ac21159e27f4	910	/* temporary DHCP lease? */
darran	0:ac21159e27f4	911	if (dhcp->offered_t1_renew != 0xffffffffUL) {
darran	0:ac21159e27f4	912	/* set renewal period timer */
darran	0:ac21159e27f4	913	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
darran	0:ac21159e27f4	914	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
darran	0:ac21159e27f4	915	if(timeout > 0xffff) {
darran	0:ac21159e27f4	916	timeout = 0xffff;
darran	0:ac21159e27f4	917	}
darran	0:ac21159e27f4	918	dhcp->t1_timeout = (u16_t)timeout;
darran	0:ac21159e27f4	919	if (dhcp->t1_timeout == 0) {
darran	0:ac21159e27f4	920	dhcp->t1_timeout = 1;
darran	0:ac21159e27f4	921	}
darran	0:ac21159e27f4	922	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
darran	0:ac21159e27f4	923	}
darran	0:ac21159e27f4	924	/* set renewal period timer */
darran	0:ac21159e27f4	925	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
darran	0:ac21159e27f4	926	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
darran	0:ac21159e27f4	927	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
darran	0:ac21159e27f4	928	if(timeout > 0xffff) {
darran	0:ac21159e27f4	929	timeout = 0xffff;
darran	0:ac21159e27f4	930	}
darran	0:ac21159e27f4	931	dhcp->t2_timeout = (u16_t)timeout;
darran	0:ac21159e27f4	932	if (dhcp->t2_timeout == 0) {
darran	0:ac21159e27f4	933	dhcp->t2_timeout = 1;
darran	0:ac21159e27f4	934	}
darran	0:ac21159e27f4	935	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
darran	0:ac21159e27f4	936	}
darran	0:ac21159e27f4	937
darran	0:ac21159e27f4	938	if (dhcp->subnet_mask_given) {
darran	0:ac21159e27f4	939	/* copy offered network mask */
darran	0:ac21159e27f4	940	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
darran	0:ac21159e27f4	941	} else {
darran	0:ac21159e27f4	942	/* subnet mask not given, choose a safe subnet mask given the network class */
darran	0:ac21159e27f4	943	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
darran	0:ac21159e27f4	944	if (first_octet <= 127) {
darran	0:ac21159e27f4	945	ip4_addr_set_u32(&sn_mask, htonl(0xff000000));
darran	0:ac21159e27f4	946	} else if (first_octet >= 192) {
darran	0:ac21159e27f4	947	ip4_addr_set_u32(&sn_mask, htonl(0xffffff00));
darran	0:ac21159e27f4	948	} else {
darran	0:ac21159e27f4	949	ip4_addr_set_u32(&sn_mask, htonl(0xffff0000));
darran	0:ac21159e27f4	950	}
darran	0:ac21159e27f4	951	}
darran	0:ac21159e27f4	952
darran	0:ac21159e27f4	953	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
darran	0:ac21159e27f4	954	/* gateway address not given? */
darran	0:ac21159e27f4	955	if (ip_addr_isany(&gw_addr)) {
darran	0:ac21159e27f4	956	/* copy network address */
darran	0:ac21159e27f4	957	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
darran	0:ac21159e27f4	958	/* use first host address on network as gateway */
darran	0:ac21159e27f4	959	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| htonl(0x00000001));
darran	0:ac21159e27f4	960	}
darran	0:ac21159e27f4	961
darran	0:ac21159e27f4	962	#if LWIP_DHCP_AUTOIP_COOP
darran	0:ac21159e27f4	963	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
darran	0:ac21159e27f4	964	autoip_stop(netif);
darran	0:ac21159e27f4	965	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
darran	0:ac21159e27f4	966	}
darran	0:ac21159e27f4	967	#endif /* LWIP_DHCP_AUTOIP_COOP */
darran	0:ac21159e27f4	968
darran	0:ac21159e27f4	969	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
darran	0:ac21159e27f4	970	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:ac21159e27f4	971	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
darran	0:ac21159e27f4	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
darran	0:ac21159e27f4	973	ip4_addr_get_u32(&sn_mask)));
darran	0:ac21159e27f4	974	netif_set_netmask(netif, &sn_mask);
darran	0:ac21159e27f4	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
darran	0:ac21159e27f4	976	ip4_addr_get_u32(&gw_addr)));
darran	0:ac21159e27f4	977	netif_set_gw(netif, &gw_addr);
darran	0:ac21159e27f4	978	/* bring the interface up */
darran	0:ac21159e27f4	979	netif_set_up(netif);
darran	0:ac21159e27f4	980	/* netif is now bound to DHCP leased address */
darran	0:ac21159e27f4	981	dhcp_set_state(dhcp, DHCP_BOUND);
darran	0:ac21159e27f4	982	}
darran	0:ac21159e27f4	983
darran	0:ac21159e27f4	984	/**
darran	0:ac21159e27f4	985	* Renew an existing DHCP lease at the involved DHCP server.
darran	0:ac21159e27f4	986	*
darran	0:ac21159e27f4	987	* @param netif network interface which must renew its lease
darran	0:ac21159e27f4	988	*/
darran	0:ac21159e27f4	989	err_t
darran	0:ac21159e27f4	990	dhcp_renew(struct netif *netif)
darran	0:ac21159e27f4	991	{
darran	0:ac21159e27f4	992	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	993	err_t result;
darran	0:ac21159e27f4	994	u16_t msecs;
darran	0:ac21159e27f4	995	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
darran	0:ac21159e27f4	996	dhcp_set_state(dhcp, DHCP_RENEWING);
darran	0:ac21159e27f4	997
darran	0:ac21159e27f4	998	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	999	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:ac21159e27f4	1000	if (result == ERR_OK) {
darran	0:ac21159e27f4	1001	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:ac21159e27f4	1002	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:ac21159e27f4	1003
darran	0:ac21159e27f4	1004	#if LWIP_NETIF_HOSTNAME
darran	0:ac21159e27f4	1005	if (netif->hostname != NULL) {
darran	0:ac21159e27f4	1006	const char p = (const char)netif->hostname;
darran	0:ac21159e27f4	1007	u8_t namelen = (u8_t)strlen(p);
darran	0:ac21159e27f4	1008	if (namelen > 0) {
darran	0:ac21159e27f4	1009	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
darran	0:ac21159e27f4	1010	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
darran	0:ac21159e27f4	1011	while (*p) {
darran	0:ac21159e27f4	1012	dhcp_option_byte(dhcp, *p++);
darran	0:ac21159e27f4	1013	}
darran	0:ac21159e27f4	1014	}
darran	0:ac21159e27f4	1015	}
darran	0:ac21159e27f4	1016	#endif /* LWIP_NETIF_HOSTNAME */
darran	0:ac21159e27f4	1017
darran	0:ac21159e27f4	1018	#if 0
darran	0:ac21159e27f4	1019	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:ac21159e27f4	1020	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
darran	0:ac21159e27f4	1021	#endif
darran	0:ac21159e27f4	1022
darran	0:ac21159e27f4	1023	#if 0
darran	0:ac21159e27f4	1024	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
darran	0:ac21159e27f4	1025	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
darran	0:ac21159e27f4	1026	#endif
darran	0:ac21159e27f4	1027	/* append DHCP message trailer */
darran	0:ac21159e27f4	1028	dhcp_option_trailer(dhcp);
darran	0:ac21159e27f4	1029
darran	0:ac21159e27f4	1030	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:ac21159e27f4	1031
darran	0:ac21159e27f4	1032	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	1033	dhcp_delete_msg(dhcp);
darran	0:ac21159e27f4	1034
darran	0:ac21159e27f4	1035	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
darran	0:ac21159e27f4	1036	} else {
darran	0:ac21159e27f4	1037	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	1038	}
darran	0:ac21159e27f4	1039	dhcp->tries++;
darran	0:ac21159e27f4	1040	/* back-off on retries, but to a maximum of 20 seconds */
darran	0:ac21159e27f4	1041	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
darran	0:ac21159e27f4	1042	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	1043	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	1044	return result;
darran	0:ac21159e27f4	1045	}
darran	0:ac21159e27f4	1046
darran	0:ac21159e27f4	1047	/**
darran	0:ac21159e27f4	1048	* Rebind with a DHCP server for an existing DHCP lease.
darran	0:ac21159e27f4	1049	*
darran	0:ac21159e27f4	1050	* @param netif network interface which must rebind with a DHCP server
darran	0:ac21159e27f4	1051	*/
darran	0:ac21159e27f4	1052	static err_t
darran	0:ac21159e27f4	1053	dhcp_rebind(struct netif *netif)
darran	0:ac21159e27f4	1054	{
darran	0:ac21159e27f4	1055	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	1056	err_t result;
darran	0:ac21159e27f4	1057	u16_t msecs;
darran	0:ac21159e27f4	1058	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
darran	0:ac21159e27f4	1059	dhcp_set_state(dhcp, DHCP_REBINDING);
darran	0:ac21159e27f4	1060
darran	0:ac21159e27f4	1061	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	1062	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:ac21159e27f4	1063	if (result == ERR_OK) {
darran	0:ac21159e27f4	1064	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:ac21159e27f4	1065	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:ac21159e27f4	1066
darran	0:ac21159e27f4	1067	#if LWIP_NETIF_HOSTNAME
darran	0:ac21159e27f4	1068	if (netif->hostname != NULL) {
darran	0:ac21159e27f4	1069	const char p = (const char)netif->hostname;
darran	0:ac21159e27f4	1070	u8_t namelen = (u8_t)strlen(p);
darran	0:ac21159e27f4	1071	if (namelen > 0) {
darran	0:ac21159e27f4	1072	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
darran	0:ac21159e27f4	1073	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
darran	0:ac21159e27f4	1074	while (*p) {
darran	0:ac21159e27f4	1075	dhcp_option_byte(dhcp, *p++);
darran	0:ac21159e27f4	1076	}
darran	0:ac21159e27f4	1077	}
darran	0:ac21159e27f4	1078	}
darran	0:ac21159e27f4	1079	#endif /* LWIP_NETIF_HOSTNAME */
darran	0:ac21159e27f4	1080
darran	0:ac21159e27f4	1081	#if 0
darran	0:ac21159e27f4	1082	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:ac21159e27f4	1083	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
darran	0:ac21159e27f4	1084
darran	0:ac21159e27f4	1085	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
darran	0:ac21159e27f4	1086	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
darran	0:ac21159e27f4	1087	#endif
darran	0:ac21159e27f4	1088
darran	0:ac21159e27f4	1089	dhcp_option_trailer(dhcp);
darran	0:ac21159e27f4	1090
darran	0:ac21159e27f4	1091	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:ac21159e27f4	1092
darran	0:ac21159e27f4	1093	/* broadcast to server */
darran	0:ac21159e27f4	1094	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	1095	dhcp_delete_msg(dhcp);
darran	0:ac21159e27f4	1096	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
darran	0:ac21159e27f4	1097	} else {
darran	0:ac21159e27f4	1098	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	1099	}
darran	0:ac21159e27f4	1100	dhcp->tries++;
darran	0:ac21159e27f4	1101	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
darran	0:ac21159e27f4	1102	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	1103	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	1104	return result;
darran	0:ac21159e27f4	1105	}
darran	0:ac21159e27f4	1106
darran	0:ac21159e27f4	1107	/**
darran	0:ac21159e27f4	1108	* Enter REBOOTING state to verify an existing lease
darran	0:ac21159e27f4	1109	*
darran	0:ac21159e27f4	1110	* @param netif network interface which must reboot
darran	0:ac21159e27f4	1111	*/
darran	0:ac21159e27f4	1112	static err_t
darran	0:ac21159e27f4	1113	dhcp_reboot(struct netif *netif)
darran	0:ac21159e27f4	1114	{
darran	0:ac21159e27f4	1115	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	1116	err_t result;
darran	0:ac21159e27f4	1117	u16_t msecs;
darran	0:ac21159e27f4	1118	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
darran	0:ac21159e27f4	1119	dhcp_set_state(dhcp, DHCP_REBOOTING);
darran	0:ac21159e27f4	1120
darran	0:ac21159e27f4	1121	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	1122	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:ac21159e27f4	1123	if (result == ERR_OK) {
darran	0:ac21159e27f4	1124	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:ac21159e27f4	1125	dhcp_option_short(dhcp, 576);
darran	0:ac21159e27f4	1126
darran	0:ac21159e27f4	1127	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:ac21159e27f4	1128	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:ac21159e27f4	1129
darran	0:ac21159e27f4	1130	dhcp_option_trailer(dhcp);
darran	0:ac21159e27f4	1131
darran	0:ac21159e27f4	1132	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:ac21159e27f4	1133
darran	0:ac21159e27f4	1134	/* broadcast to server */
darran	0:ac21159e27f4	1135	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	1136	dhcp_delete_msg(dhcp);
darran	0:ac21159e27f4	1137	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
darran	0:ac21159e27f4	1138	} else {
darran	0:ac21159e27f4	1139	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	1140	}
darran	0:ac21159e27f4	1141	dhcp->tries++;
darran	0:ac21159e27f4	1142	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
darran	0:ac21159e27f4	1143	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	1144	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	1145	return result;
darran	0:ac21159e27f4	1146	}
darran	0:ac21159e27f4	1147
darran	0:ac21159e27f4	1148
darran	0:ac21159e27f4	1149	/**
darran	0:ac21159e27f4	1150	* Release a DHCP lease.
darran	0:ac21159e27f4	1151	*
darran	0:ac21159e27f4	1152	* @param netif network interface which must release its lease
darran	0:ac21159e27f4	1153	*/
darran	0:ac21159e27f4	1154	err_t
darran	0:ac21159e27f4	1155	dhcp_release(struct netif *netif)
darran	0:ac21159e27f4	1156	{
darran	0:ac21159e27f4	1157	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	1158	err_t result;
darran	0:ac21159e27f4	1159	u16_t msecs;
darran	0:ac21159e27f4	1160	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
darran	0:ac21159e27f4	1161
darran	0:ac21159e27f4	1162	/* idle DHCP client */
darran	0:ac21159e27f4	1163	dhcp_set_state(dhcp, DHCP_OFF);
darran	0:ac21159e27f4	1164	/* clean old DHCP offer */
darran	0:ac21159e27f4	1165	ip_addr_set_zero(&dhcp->server_ip_addr);
darran	0:ac21159e27f4	1166	ip_addr_set_zero(&dhcp->offered_ip_addr);
darran	0:ac21159e27f4	1167	ip_addr_set_zero(&dhcp->offered_sn_mask);
darran	0:ac21159e27f4	1168	ip_addr_set_zero(&dhcp->offered_gw_addr);
darran	0:ac21159e27f4	1169	#if LWIP_DHCP_BOOTP_FILE
darran	0:ac21159e27f4	1170	ip_addr_set_zero(&dhcp->offered_si_addr);
darran	0:ac21159e27f4	1171	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:ac21159e27f4	1172	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
darran	0:ac21159e27f4	1173
darran	0:ac21159e27f4	1174	/* create and initialize the DHCP message header */
darran	0:ac21159e27f4	1175	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
darran	0:ac21159e27f4	1176	if (result == ERR_OK) {
darran	0:ac21159e27f4	1177	dhcp_option_trailer(dhcp);
darran	0:ac21159e27f4	1178
darran	0:ac21159e27f4	1179	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:ac21159e27f4	1180
darran	0:ac21159e27f4	1181	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
darran	0:ac21159e27f4	1182	dhcp_delete_msg(dhcp);
darran	0:ac21159e27f4	1183	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
darran	0:ac21159e27f4	1184	} else {
darran	0:ac21159e27f4	1185	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
darran	0:ac21159e27f4	1186	}
darran	0:ac21159e27f4	1187	dhcp->tries++;
darran	0:ac21159e27f4	1188	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
darran	0:ac21159e27f4	1189	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:ac21159e27f4	1190	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:ac21159e27f4	1191	/* bring the interface down */
darran	0:ac21159e27f4	1192	netif_set_down(netif);
darran	0:ac21159e27f4	1193	/* remove IP address from interface */
darran	0:ac21159e27f4	1194	netif_set_ipaddr(netif, IP_ADDR_ANY);
darran	0:ac21159e27f4	1195	netif_set_gw(netif, IP_ADDR_ANY);
darran	0:ac21159e27f4	1196	netif_set_netmask(netif, IP_ADDR_ANY);
darran	0:ac21159e27f4	1197
darran	0:ac21159e27f4	1198	return result;
darran	0:ac21159e27f4	1199	}
darran	0:ac21159e27f4	1200
darran	0:ac21159e27f4	1201	/**
darran	0:ac21159e27f4	1202	* Remove the DHCP client from the interface.
darran	0:ac21159e27f4	1203	*
darran	0:ac21159e27f4	1204	* @param netif The network interface to stop DHCP on
darran	0:ac21159e27f4	1205	*/
darran	0:ac21159e27f4	1206	void
darran	0:ac21159e27f4	1207	dhcp_stop(struct netif *netif)
darran	0:ac21159e27f4	1208	{
darran	0:ac21159e27f4	1209	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	1210	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
darran	0:ac21159e27f4	1211	/* Remove the flag that says this netif is handled by DHCP. */
darran	0:ac21159e27f4	1212	netif->flags &= ~NETIF_FLAG_DHCP;
darran	0:ac21159e27f4	1213
darran	0:ac21159e27f4	1214	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
darran	0:ac21159e27f4	1215	/* netif is DHCP configured? */
darran	0:ac21159e27f4	1216	if (dhcp != NULL) {
darran	0:ac21159e27f4	1217	#if LWIP_DHCP_AUTOIP_COOP
darran	0:ac21159e27f4	1218	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
darran	0:ac21159e27f4	1219	autoip_stop(netif);
darran	0:ac21159e27f4	1220	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
darran	0:ac21159e27f4	1221	}
darran	0:ac21159e27f4	1222	#endif /* LWIP_DHCP_AUTOIP_COOP */
darran	0:ac21159e27f4	1223
darran	0:ac21159e27f4	1224	if (dhcp->pcb != NULL) {
darran	0:ac21159e27f4	1225	udp_remove(dhcp->pcb);
darran	0:ac21159e27f4	1226	dhcp->pcb = NULL;
darran	0:ac21159e27f4	1227	}
darran	0:ac21159e27f4	1228	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
darran	0:ac21159e27f4	1229	dhcp_set_state(dhcp, DHCP_OFF);
darran	0:ac21159e27f4	1230	}
darran	0:ac21159e27f4	1231	}
darran	0:ac21159e27f4	1232
darran	0:ac21159e27f4	1233	/*
darran	0:ac21159e27f4	1234	* Set the DHCP state of a DHCP client.
darran	0:ac21159e27f4	1235	*
darran	0:ac21159e27f4	1236	* If the state changed, reset the number of tries.
darran	0:ac21159e27f4	1237	*/
darran	0:ac21159e27f4	1238	static void
darran	0:ac21159e27f4	1239	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
darran	0:ac21159e27f4	1240	{
darran	0:ac21159e27f4	1241	if (new_state != dhcp->state) {
darran	0:ac21159e27f4	1242	dhcp->state = new_state;
darran	0:ac21159e27f4	1243	dhcp->tries = 0;
darran	0:ac21159e27f4	1244	dhcp->request_timeout = 0;
darran	0:ac21159e27f4	1245	}
darran	0:ac21159e27f4	1246	}
darran	0:ac21159e27f4	1247
darran	0:ac21159e27f4	1248	/*
darran	0:ac21159e27f4	1249	* Concatenate an option type and length field to the outgoing
darran	0:ac21159e27f4	1250	* DHCP message.
darran	0:ac21159e27f4	1251	*
darran	0:ac21159e27f4	1252	*/
darran	0:ac21159e27f4	1253	static void
darran	0:ac21159e27f4	1254	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
darran	0:ac21159e27f4	1255	{
darran	0:ac21159e27f4	1256	LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
darran	0:ac21159e27f4	1257	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
darran	0:ac21159e27f4	1258	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
darran	0:ac21159e27f4	1259	}
darran	0:ac21159e27f4	1260	/*
darran	0:ac21159e27f4	1261	* Concatenate a single byte to the outgoing DHCP message.
darran	0:ac21159e27f4	1262	*
darran	0:ac21159e27f4	1263	*/
darran	0:ac21159e27f4	1264	static void
darran	0:ac21159e27f4	1265	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
darran	0:ac21159e27f4	1266	{
darran	0:ac21159e27f4	1267	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
darran	0:ac21159e27f4	1268	dhcp->msg_out->options[dhcp->options_out_len++] = value;
darran	0:ac21159e27f4	1269	}
darran	0:ac21159e27f4	1270
darran	0:ac21159e27f4	1271	static void
darran	0:ac21159e27f4	1272	dhcp_option_short(struct dhcp *dhcp, u16_t value)
darran	0:ac21159e27f4	1273	{
darran	0:ac21159e27f4	1274	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
darran	0:ac21159e27f4	1275	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
darran	0:ac21159e27f4	1276	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
darran	0:ac21159e27f4	1277	}
darran	0:ac21159e27f4	1278
darran	0:ac21159e27f4	1279	static void
darran	0:ac21159e27f4	1280	dhcp_option_long(struct dhcp *dhcp, u32_t value)
darran	0:ac21159e27f4	1281	{
darran	0:ac21159e27f4	1282	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
darran	0:ac21159e27f4	1283	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
darran	0:ac21159e27f4	1284	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
darran	0:ac21159e27f4	1285	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
darran	0:ac21159e27f4	1286	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
darran	0:ac21159e27f4	1287	}
darran	0:ac21159e27f4	1288
darran	0:ac21159e27f4	1289	/**
darran	0:ac21159e27f4	1290	* Extract the DHCP message and the DHCP options.
darran	0:ac21159e27f4	1291	*
darran	0:ac21159e27f4	1292	* Extract the DHCP message and the DHCP options, each into a contiguous
darran	0:ac21159e27f4	1293	* piece of memory. As a DHCP message is variable sized by its options,
darran	0:ac21159e27f4	1294	* and also allows overriding some fields for options, the easy approach
darran	0:ac21159e27f4	1295	* is to first unfold the options into a conitguous piece of memory, and
darran	0:ac21159e27f4	1296	* use that further on.
darran	0:ac21159e27f4	1297	*
darran	0:ac21159e27f4	1298	*/
darran	0:ac21159e27f4	1299	static err_t
darran	0:ac21159e27f4	1300	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
darran	0:ac21159e27f4	1301	{
darran	0:ac21159e27f4	1302	u8_t *options;
darran	0:ac21159e27f4	1303	u16_t offset;
darran	0:ac21159e27f4	1304	u16_t offset_max;
darran	0:ac21159e27f4	1305	u16_t options_idx;
darran	0:ac21159e27f4	1306	u16_t options_idx_max;
darran	0:ac21159e27f4	1307	struct pbuf *q;
darran	0:ac21159e27f4	1308	int parse_file_as_options = 0;
darran	0:ac21159e27f4	1309	int parse_sname_as_options = 0;
darran	0:ac21159e27f4	1310
darran	0:ac21159e27f4	1311	/* clear received options */
darran	0:ac21159e27f4	1312	dhcp_clear_all_options(dhcp);
darran	0:ac21159e27f4	1313	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
darran	0:ac21159e27f4	1314	if (p->len < DHCP_SNAME_OFS) {
darran	0:ac21159e27f4	1315	return ERR_BUF;
darran	0:ac21159e27f4	1316	}
darran	0:ac21159e27f4	1317	dhcp->msg_in = (struct dhcp_msg *)p->payload;
darran	0:ac21159e27f4	1318	#if LWIP_DHCP_BOOTP_FILE
darran	0:ac21159e27f4	1319	/* clear boot file name */
darran	0:ac21159e27f4	1320	dhcp->boot_file_name[0] = 0;
darran	0:ac21159e27f4	1321	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:ac21159e27f4	1322
darran	0:ac21159e27f4	1323	/* parse options */
darran	0:ac21159e27f4	1324
darran	0:ac21159e27f4	1325	/* start with options field */
darran	0:ac21159e27f4	1326	options_idx = DHCP_OPTIONS_OFS;
darran	0:ac21159e27f4	1327	/* parse options to the end of the received packet */
darran	0:ac21159e27f4	1328	options_idx_max = p->tot_len;
darran	0:ac21159e27f4	1329	again:
darran	0:ac21159e27f4	1330	q = p;
darran	0:ac21159e27f4	1331	while((q != NULL) && (options_idx >= q->len)) {
darran	0:ac21159e27f4	1332	options_idx -= q->len;
darran	0:ac21159e27f4	1333	options_idx_max -= q->len;
darran	0:ac21159e27f4	1334	q = q->next;
darran	0:ac21159e27f4	1335	}
darran	0:ac21159e27f4	1336	if (q == NULL) {
darran	0:ac21159e27f4	1337	return ERR_BUF;
darran	0:ac21159e27f4	1338	}
darran	0:ac21159e27f4	1339	offset = options_idx;
darran	0:ac21159e27f4	1340	offset_max = options_idx_max;
darran	0:ac21159e27f4	1341	options = (u8_t*)q->payload;
darran	0:ac21159e27f4	1342	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
darran	0:ac21159e27f4	1343	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
darran	0:ac21159e27f4	1344	u8_t op = options[offset];
darran	0:ac21159e27f4	1345	u8_t len;
darran	0:ac21159e27f4	1346	u8_t decode_len = 0;
darran	0:ac21159e27f4	1347	int decode_idx = -1;
darran	0:ac21159e27f4	1348	u16_t val_offset = offset + 2;
darran	0:ac21159e27f4	1349	/* len byte might be in the next pbuf */
darran	0:ac21159e27f4	1350	if (offset + 1 < q->len) {
darran	0:ac21159e27f4	1351	len = options[offset + 1];
darran	0:ac21159e27f4	1352	} else {
darran	0:ac21159e27f4	1353	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
darran	0:ac21159e27f4	1354	}
darran	0:ac21159e27f4	1355	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
darran	0:ac21159e27f4	1356	decode_len = len;
darran	0:ac21159e27f4	1357	switch(op) {
darran	0:ac21159e27f4	1358	/* case(DHCP_OPTION_END): handled above */
darran	0:ac21159e27f4	1359	case(DHCP_OPTION_PAD):
darran	0:ac21159e27f4	1360	/* special option: no len encoded */
darran	0:ac21159e27f4	1361	decode_len = len = 0;
darran	0:ac21159e27f4	1362	/* will be increased below */
darran	0:ac21159e27f4	1363	offset--;
darran	0:ac21159e27f4	1364	break;
darran	0:ac21159e27f4	1365	case(DHCP_OPTION_SUBNET_MASK):
darran	0:ac21159e27f4	1366	LWIP_ASSERT("len == 4", len == 4);
darran	0:ac21159e27f4	1367	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
darran	0:ac21159e27f4	1368	break;
darran	0:ac21159e27f4	1369	case(DHCP_OPTION_ROUTER):
darran	0:ac21159e27f4	1370	decode_len = 4; /* only copy the first given router */
darran	0:ac21159e27f4	1371	LWIP_ASSERT("len >= decode_len", len >= decode_len);
darran	0:ac21159e27f4	1372	decode_idx = DHCP_OPTION_IDX_ROUTER;
darran	0:ac21159e27f4	1373	break;
darran	0:ac21159e27f4	1374	case(DHCP_OPTION_DNS_SERVER):
darran	0:ac21159e27f4	1375	/* special case: there might be more than one server */
darran	0:ac21159e27f4	1376	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
darran	0:ac21159e27f4	1377	/* limit number of DNS servers */
darran	0:ac21159e27f4	1378	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
darran	0:ac21159e27f4	1379	LWIP_ASSERT("len >= decode_len", len >= decode_len);
darran	0:ac21159e27f4	1380	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
darran	0:ac21159e27f4	1381	break;
darran	0:ac21159e27f4	1382	case(DHCP_OPTION_LEASE_TIME):
darran	0:ac21159e27f4	1383	LWIP_ASSERT("len == 4", len == 4);
darran	0:ac21159e27f4	1384	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
darran	0:ac21159e27f4	1385	break;
darran	0:ac21159e27f4	1386	case(DHCP_OPTION_OVERLOAD):
darran	0:ac21159e27f4	1387	LWIP_ASSERT("len == 1", len == 1);
darran	0:ac21159e27f4	1388	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
darran	0:ac21159e27f4	1389	break;
darran	0:ac21159e27f4	1390	case(DHCP_OPTION_MESSAGE_TYPE):
darran	0:ac21159e27f4	1391	LWIP_ASSERT("len == 1", len == 1);
darran	0:ac21159e27f4	1392	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
darran	0:ac21159e27f4	1393	break;
darran	0:ac21159e27f4	1394	case(DHCP_OPTION_SERVER_ID):
darran	0:ac21159e27f4	1395	LWIP_ASSERT("len == 4", len == 4);
darran	0:ac21159e27f4	1396	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
darran	0:ac21159e27f4	1397	break;
darran	0:ac21159e27f4	1398	case(DHCP_OPTION_T1):
darran	0:ac21159e27f4	1399	LWIP_ASSERT("len == 4", len == 4);
darran	0:ac21159e27f4	1400	decode_idx = DHCP_OPTION_IDX_T1;
darran	0:ac21159e27f4	1401	break;
darran	0:ac21159e27f4	1402	case(DHCP_OPTION_T2):
darran	0:ac21159e27f4	1403	LWIP_ASSERT("len == 4", len == 4);
darran	0:ac21159e27f4	1404	decode_idx = DHCP_OPTION_IDX_T2;
darran	0:ac21159e27f4	1405	break;
darran	0:ac21159e27f4	1406	default:
darran	0:ac21159e27f4	1407	decode_len = 0;
darran	0:ac21159e27f4	1408	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
darran	0:ac21159e27f4	1409	break;
darran	0:ac21159e27f4	1410	}
darran	0:ac21159e27f4	1411	offset += len + 2;
darran	0:ac21159e27f4	1412	if (decode_len > 0) {
darran	0:ac21159e27f4	1413	u32_t value = 0;
darran	0:ac21159e27f4	1414	u16_t copy_len;
darran	0:ac21159e27f4	1415	decode_next:
darran	0:ac21159e27f4	1416	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
darran	0:ac21159e27f4	1417	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
darran	0:ac21159e27f4	1418	copy_len = LWIP_MIN(decode_len, 4);
darran	0:ac21159e27f4	1419	pbuf_copy_partial(q, &value, copy_len, val_offset);
darran	0:ac21159e27f4	1420	if (decode_len > 4) {
darran	0:ac21159e27f4	1421	/* decode more than one u32_t */
darran	0:ac21159e27f4	1422	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
darran	0:ac21159e27f4	1423	dhcp_got_option(dhcp, decode_idx);
darran	0:ac21159e27f4	1424	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
darran	0:ac21159e27f4	1425	decode_len -= 4;
darran	0:ac21159e27f4	1426	val_offset += 4;
darran	0:ac21159e27f4	1427	decode_idx++;
darran	0:ac21159e27f4	1428	goto decode_next;
darran	0:ac21159e27f4	1429	} else if (decode_len == 4) {
darran	0:ac21159e27f4	1430	value = ntohl(value);
darran	0:ac21159e27f4	1431	} else {
darran	0:ac21159e27f4	1432	LWIP_ASSERT("invalid decode_len", decode_len == 1);
darran	0:ac21159e27f4	1433	}
darran	0:ac21159e27f4	1434	dhcp_got_option(dhcp, decode_idx);
darran	0:ac21159e27f4	1435	dhcp_set_option_value(dhcp, decode_idx, value);
darran	0:ac21159e27f4	1436	}
darran	0:ac21159e27f4	1437	if (offset >= q->len) {
darran	0:ac21159e27f4	1438	offset -= q->len;
darran	0:ac21159e27f4	1439	offset_max -= q->len;
darran	0:ac21159e27f4	1440	q = q->next;
darran	0:ac21159e27f4	1441	options = (u8_t*)q->payload;
darran	0:ac21159e27f4	1442	}
darran	0:ac21159e27f4	1443	}
darran	0:ac21159e27f4	1444	/* is this an overloaded message? */
darran	0:ac21159e27f4	1445	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
darran	0:ac21159e27f4	1446	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
darran	0:ac21159e27f4	1447	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
darran	0:ac21159e27f4	1448	if (overload == DHCP_OVERLOAD_FILE) {
darran	0:ac21159e27f4	1449	parse_file_as_options = 1;
darran	0:ac21159e27f4	1450	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
darran	0:ac21159e27f4	1451	} else if (overload == DHCP_OVERLOAD_SNAME) {
darran	0:ac21159e27f4	1452	parse_sname_as_options = 1;
darran	0:ac21159e27f4	1453	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
darran	0:ac21159e27f4	1454	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
darran	0:ac21159e27f4	1455	parse_sname_as_options = 1;
darran	0:ac21159e27f4	1456	parse_file_as_options = 1;
darran	0:ac21159e27f4	1457	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
darran	0:ac21159e27f4	1458	} else {
darran	0:ac21159e27f4	1459	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
darran	0:ac21159e27f4	1460	}
darran	0:ac21159e27f4	1461	#if LWIP_DHCP_BOOTP_FILE
darran	0:ac21159e27f4	1462	if (!parse_file_as_options) {
darran	0:ac21159e27f4	1463	/* only do this for ACK messages */
darran	0:ac21159e27f4	1464	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
darran	0:ac21159e27f4	1465	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
darran	0:ac21159e27f4	1466	/* copy bootp file name, don't care for sname (server hostname) */
darran	0:ac21159e27f4	1467	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
darran	0:ac21159e27f4	1468	/* make sure the string is really NULL-terminated */
darran	0:ac21159e27f4	1469	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
darran	0:ac21159e27f4	1470	}
darran	0:ac21159e27f4	1471	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:ac21159e27f4	1472	}
darran	0:ac21159e27f4	1473	if (parse_file_as_options) {
darran	0:ac21159e27f4	1474	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
darran	0:ac21159e27f4	1475	parse_file_as_options = 0;
darran	0:ac21159e27f4	1476	options_idx = DHCP_FILE_OFS;
darran	0:ac21159e27f4	1477	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
darran	0:ac21159e27f4	1478	goto again;
darran	0:ac21159e27f4	1479	} else if (parse_sname_as_options) {
darran	0:ac21159e27f4	1480	parse_sname_as_options = 0;
darran	0:ac21159e27f4	1481	options_idx = DHCP_SNAME_OFS;
darran	0:ac21159e27f4	1482	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
darran	0:ac21159e27f4	1483	goto again;
darran	0:ac21159e27f4	1484	}
darran	0:ac21159e27f4	1485	return ERR_OK;
darran	0:ac21159e27f4	1486	}
darran	0:ac21159e27f4	1487
darran	0:ac21159e27f4	1488	/**
darran	0:ac21159e27f4	1489	* If an incoming DHCP message is in response to us, then trigger the state machine
darran	0:ac21159e27f4	1490	*/
darran	0:ac21159e27f4	1491	static void
darran	0:ac21159e27f4	1492	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
darran	0:ac21159e27f4	1493	{
darran	0:ac21159e27f4	1494	struct netif netif = (struct netif )arg;
darran	0:ac21159e27f4	1495	struct dhcp *dhcp = netif->dhcp;
darran	0:ac21159e27f4	1496	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
darran	0:ac21159e27f4	1497	u8_t msg_type;
darran	0:ac21159e27f4	1498	u8_t i;
darran	0:ac21159e27f4	1499	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,
darran	0:ac21159e27f4	1500	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
darran	0:ac21159e27f4	1501	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
darran	0:ac21159e27f4	1502	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
darran	0:ac21159e27f4	1503	/* prevent warnings about unused arguments */
darran	0:ac21159e27f4	1504	LWIP_UNUSED_ARG(pcb);
darran	0:ac21159e27f4	1505	LWIP_UNUSED_ARG(addr);
darran	0:ac21159e27f4	1506	LWIP_UNUSED_ARG(port);
darran	0:ac21159e27f4	1507
darran	0:ac21159e27f4	1508	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
darran	0:ac21159e27f4	1509
darran	0:ac21159e27f4	1510	if (p->len < DHCP_MIN_REPLY_LEN) {
darran	0:ac21159e27f4	1511	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
darran	0:ac21159e27f4	1512	goto free_pbuf_and_return;
darran	0:ac21159e27f4	1513	}
darran	0:ac21159e27f4	1514
darran	0:ac21159e27f4	1515	if (reply_msg->op != DHCP_BOOTREPLY) {
darran	0:ac21159e27f4	1516	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));
darran	0:ac21159e27f4	1517	goto free_pbuf_and_return;
darran	0:ac21159e27f4	1518	}
darran	0:ac21159e27f4	1519	/* iterate through hardware address and match against DHCP message */
darran	0:ac21159e27f4	1520	for (i = 0; i < netif->hwaddr_len; i++) {
darran	0:ac21159e27f4	1521	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
darran	0:ac21159e27f4	1522	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
darran	0:ac21159e27f4	1523	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
darran	0:ac21159e27f4	1524	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
darran	0:ac21159e27f4	1525	goto free_pbuf_and_return;
darran	0:ac21159e27f4	1526	}
darran	0:ac21159e27f4	1527	}
darran	0:ac21159e27f4	1528	/* match transaction ID against what we expected */
darran	0:ac21159e27f4	1529	if (ntohl(reply_msg->xid) != dhcp->xid) {
darran	0:ac21159e27f4	1530	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
darran	0:ac21159e27f4	1531	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
darran	0:ac21159e27f4	1532	goto free_pbuf_and_return;
darran	0:ac21159e27f4	1533	}
darran	0:ac21159e27f4	1534	/* option fields could be unfold? */
darran	0:ac21159e27f4	1535	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
darran	0:ac21159e27f4	1536	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:ac21159e27f4	1537	("problem unfolding DHCP message - too short on memory?\n"));
darran	0:ac21159e27f4	1538	goto free_pbuf_and_return;
darran	0:ac21159e27f4	1539	}
darran	0:ac21159e27f4	1540
darran	0:ac21159e27f4	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
darran	0:ac21159e27f4	1542	/* obtain pointer to DHCP message type */
darran	0:ac21159e27f4	1543	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
darran	0:ac21159e27f4	1544	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
darran	0:ac21159e27f4	1545	goto free_pbuf_and_return;
darran	0:ac21159e27f4	1546	}
darran	0:ac21159e27f4	1547
darran	0:ac21159e27f4	1548	/* read DHCP message type */
darran	0:ac21159e27f4	1549	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
darran	0:ac21159e27f4	1550	/* message type is DHCP ACK? */
darran	0:ac21159e27f4	1551	if (msg_type == DHCP_ACK) {
darran	0:ac21159e27f4	1552	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
darran	0:ac21159e27f4	1553	/* in requesting state? */
darran	0:ac21159e27f4	1554	if (dhcp->state == DHCP_REQUESTING) {
darran	0:ac21159e27f4	1555	dhcp_handle_ack(netif);
darran	0:ac21159e27f4	1556	#if DHCP_DOES_ARP_CHECK
darran	0:ac21159e27f4	1557	/* check if the acknowledged lease address is already in use */
darran	0:ac21159e27f4	1558	dhcp_check(netif);
darran	0:ac21159e27f4	1559	#else
darran	0:ac21159e27f4	1560	/* bind interface to the acknowledged lease address */
darran	0:ac21159e27f4	1561	dhcp_bind(netif);
darran	0:ac21159e27f4	1562	#endif
darran	0:ac21159e27f4	1563	}
darran	0:ac21159e27f4	1564	/* already bound to the given lease address? */
darran	0:ac21159e27f4	1565	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
darran	0:ac21159e27f4	1566	dhcp_bind(netif);
darran	0:ac21159e27f4	1567	}
darran	0:ac21159e27f4	1568	}
darran	0:ac21159e27f4	1569	/* received a DHCP_NAK in appropriate state? */
darran	0:ac21159e27f4	1570	else if ((msg_type == DHCP_NAK) &&
darran	0:ac21159e27f4	1571	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
darran	0:ac21159e27f4	1572	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
darran	0:ac21159e27f4	1573	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
darran	0:ac21159e27f4	1574	dhcp_handle_nak(netif);
darran	0:ac21159e27f4	1575	}
darran	0:ac21159e27f4	1576	/* received a DHCP_OFFER in DHCP_SELECTING state? */
darran	0:ac21159e27f4	1577	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
darran	0:ac21159e27f4	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
darran	0:ac21159e27f4	1579	dhcp->request_timeout = 0;
darran	0:ac21159e27f4	1580	/* remember offered lease */
darran	0:ac21159e27f4	1581	dhcp_handle_offer(netif);
darran	0:ac21159e27f4	1582	}
darran	0:ac21159e27f4	1583	free_pbuf_and_return:
darran	0:ac21159e27f4	1584	dhcp->msg_in = NULL;
darran	0:ac21159e27f4	1585	pbuf_free(p);
darran	0:ac21159e27f4	1586	}
darran	0:ac21159e27f4	1587
darran	0:ac21159e27f4	1588	/**
darran	0:ac21159e27f4	1589	* Create a DHCP request, fill in common headers
darran	0:ac21159e27f4	1590	*
darran	0:ac21159e27f4	1591	* @param netif the netif under DHCP control
darran	0:ac21159e27f4	1592	* @param dhcp dhcp control struct
darran	0:ac21159e27f4	1593	* @param message_type message type of the request
darran	0:ac21159e27f4	1594	*/
darran	0:ac21159e27f4	1595	static err_t
darran	0:ac21159e27f4	1596	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
darran	0:ac21159e27f4	1597	{
darran	0:ac21159e27f4	1598	u16_t i;
darran	0:ac21159e27f4	1599	#ifndef DHCP_GLOBAL_XID
darran	0:ac21159e27f4	1600	/** default global transaction identifier starting value (easy to match
darran	0:ac21159e27f4	1601	* with a packet analyser). We simply increment for each new request.
darran	0:ac21159e27f4	1602	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
darran	0:ac21159e27f4	1603	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
darran	0:ac21159e27f4	1604	static u32_t xid = 0xABCD0000;
darran	0:ac21159e27f4	1605	#else
darran	0:ac21159e27f4	1606	static u32_t xid;
darran	0:ac21159e27f4	1607	static u8_t xid_initialised = 0;
darran	0:ac21159e27f4	1608	if (!xid_initialised) {
darran	0:ac21159e27f4	1609	xid = DHCP_GLOBAL_XID;
darran	0:ac21159e27f4	1610	xid_initialised = !xid_initialised;
darran	0:ac21159e27f4	1611	}
darran	0:ac21159e27f4	1612	#endif
darran	0:ac21159e27f4	1613	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
darran	0:ac21159e27f4	1614	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
darran	0:ac21159e27f4	1615	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
darran	0:ac21159e27f4	1616	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
darran	0:ac21159e27f4	1617	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
darran	0:ac21159e27f4	1618	if (dhcp->p_out == NULL) {
darran	0:ac21159e27f4	1619	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:ac21159e27f4	1620	("dhcp_create_msg(): could not allocate pbuf\n"));
darran	0:ac21159e27f4	1621	return ERR_MEM;
darran	0:ac21159e27f4	1622	}
darran	0:ac21159e27f4	1623	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
darran	0:ac21159e27f4	1624	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
darran	0:ac21159e27f4	1625
darran	0:ac21159e27f4	1626	/* reuse transaction identifier in retransmissions */
darran	0:ac21159e27f4	1627	if (dhcp->tries == 0) {
darran	0:ac21159e27f4	1628	xid++;
darran	0:ac21159e27f4	1629	}
darran	0:ac21159e27f4	1630	dhcp->xid = xid;
darran	0:ac21159e27f4	1631	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
darran	0:ac21159e27f4	1632	("transaction id xid(%"X32_F")\n", xid));
darran	0:ac21159e27f4	1633
darran	0:ac21159e27f4	1634	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
darran	0:ac21159e27f4	1635
darran	0:ac21159e27f4	1636	dhcp->msg_out->op = DHCP_BOOTREQUEST;
darran	0:ac21159e27f4	1637	/* TODO: make link layer independent */
darran	0:ac21159e27f4	1638	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
darran	0:ac21159e27f4	1639	dhcp->msg_out->hlen = netif->hwaddr_len;
darran	0:ac21159e27f4	1640	dhcp->msg_out->hops = 0;
darran	0:ac21159e27f4	1641	dhcp->msg_out->xid = htonl(dhcp->xid);
darran	0:ac21159e27f4	1642	dhcp->msg_out->secs = 0;
darran	0:ac21159e27f4	1643	/* we don't need the broadcast flag since we can receive unicast traffic
darran	0:ac21159e27f4	1644	before being fully configured! */
darran	0:ac21159e27f4	1645	dhcp->msg_out->flags = 0;
darran	0:ac21159e27f4	1646	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
darran	0:ac21159e27f4	1647	/* set ciaddr to netif->ip_addr based on message_type and state */
darran	0:ac21159e27f4	1648	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
darran	0:ac21159e27f4	1649	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
darran	0:ac21159e27f4	1650	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
darran	0:ac21159e27f4	1651	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
darran	0:ac21159e27f4	1652	}
darran	0:ac21159e27f4	1653	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
darran	0:ac21159e27f4	1654	ip_addr_set_zero(&dhcp->msg_out->siaddr);
darran	0:ac21159e27f4	1655	ip_addr_set_zero(&dhcp->msg_out->giaddr);
darran	0:ac21159e27f4	1656	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
darran	0:ac21159e27f4	1657	/* copy netif hardware address, pad with zeroes */
darran	0:ac21159e27f4	1658	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
darran	0:ac21159e27f4	1659	}
darran	0:ac21159e27f4	1660	for (i = 0; i < DHCP_SNAME_LEN; i++) {
darran	0:ac21159e27f4	1661	dhcp->msg_out->sname[i] = 0;
darran	0:ac21159e27f4	1662	}
darran	0:ac21159e27f4	1663	for (i = 0; i < DHCP_FILE_LEN; i++) {
darran	0:ac21159e27f4	1664	dhcp->msg_out->file[i] = 0;
darran	0:ac21159e27f4	1665	}
darran	0:ac21159e27f4	1666	dhcp->msg_out->cookie = htonl(DHCP_MAGIC_COOKIE);
darran	0:ac21159e27f4	1667	dhcp->options_out_len = 0;
darran	0:ac21159e27f4	1668	/* fill options field with an incrementing array (for debugging purposes) */
darran	0:ac21159e27f4	1669	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
darran	0:ac21159e27f4	1670	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
darran	0:ac21159e27f4	1671	}
darran	0:ac21159e27f4	1672	/* Add option MESSAGE_TYPE */
darran	0:ac21159e27f4	1673	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
darran	0:ac21159e27f4	1674	dhcp_option_byte(dhcp, message_type);
darran	0:ac21159e27f4	1675	return ERR_OK;
darran	0:ac21159e27f4	1676	}
darran	0:ac21159e27f4	1677
darran	0:ac21159e27f4	1678	/**
darran	0:ac21159e27f4	1679	* Free previously allocated memory used to send a DHCP request.
darran	0:ac21159e27f4	1680	*
darran	0:ac21159e27f4	1681	* @param dhcp the dhcp struct to free the request from
darran	0:ac21159e27f4	1682	*/
darran	0:ac21159e27f4	1683	static void
darran	0:ac21159e27f4	1684	dhcp_delete_msg(struct dhcp *dhcp)
darran	0:ac21159e27f4	1685	{
darran	0:ac21159e27f4	1686	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
darran	0:ac21159e27f4	1687	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
darran	0:ac21159e27f4	1688	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
darran	0:ac21159e27f4	1689	if (dhcp->p_out != NULL) {
darran	0:ac21159e27f4	1690	pbuf_free(dhcp->p_out);
darran	0:ac21159e27f4	1691	}
darran	0:ac21159e27f4	1692	dhcp->p_out = NULL;
darran	0:ac21159e27f4	1693	dhcp->msg_out = NULL;
darran	0:ac21159e27f4	1694	}
darran	0:ac21159e27f4	1695
darran	0:ac21159e27f4	1696	/**
darran	0:ac21159e27f4	1697	* Add a DHCP message trailer
darran	0:ac21159e27f4	1698	*
darran	0:ac21159e27f4	1699	* Adds the END option to the DHCP message, and if
darran	0:ac21159e27f4	1700	* necessary, up to three padding bytes.
darran	0:ac21159e27f4	1701	*
darran	0:ac21159e27f4	1702	* @param dhcp DHCP state structure
darran	0:ac21159e27f4	1703	*/
darran	0:ac21159e27f4	1704	static void
darran	0:ac21159e27f4	1705	dhcp_option_trailer(struct dhcp *dhcp)
darran	0:ac21159e27f4	1706	{
darran	0:ac21159e27f4	1707	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
darran	0:ac21159e27f4	1708	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
darran	0:ac21159e27f4	1709	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
darran	0:ac21159e27f4	1710	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
darran	0:ac21159e27f4	1711	/* packet is too small, or not 4 byte aligned? */
darran	0:ac21159e27f4	1712	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
darran	0:ac21159e27f4	1713	/* 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)); */
darran	0:ac21159e27f4	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
darran	0:ac21159e27f4	1715	/* add a fill/padding byte */
darran	0:ac21159e27f4	1716	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
darran	0:ac21159e27f4	1717	}
darran	0:ac21159e27f4	1718	}
darran	0:ac21159e27f4	1719
darran	0:ac21159e27f4	1720	#endif /* LWIP_DHCP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	02 Jul 2010
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

lwip/core/dhcp.c@0:ac21159e27f4, 2010-07-02 (annotated)

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