Bonjour - First step: AutoIP compiled in and working

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Darran Shepherd / Mbed 2 deprecated Bonjour

First step: AutoIP compiled in and working

lwip/core/dhcp.c@1:4218cacaf696, 2010-06-18 (annotated)

Committer:: darran
Date:: Fri Jun 18 15:54:21 2010 +0000
Revision:: 1:4218cacaf696
Parent:: 0:55a05330f8cc

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:55a05330f8cc	1	/**
darran	0:55a05330f8cc	2	* @file
darran	0:55a05330f8cc	3	* Dynamic Host Configuration Protocol client
darran	0:55a05330f8cc	4	*
darran	0:55a05330f8cc	5	*/
darran	0:55a05330f8cc	6
darran	0:55a05330f8cc	7	/*
darran	0:55a05330f8cc	8	*
darran	0:55a05330f8cc	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
darran	0:55a05330f8cc	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
darran	0:55a05330f8cc	11	* All rights reserved.
darran	0:55a05330f8cc	12	*
darran	0:55a05330f8cc	13	* Redistribution and use in source and binary forms, with or without modification,
darran	0:55a05330f8cc	14	* are permitted provided that the following conditions are met:
darran	0:55a05330f8cc	15	*
darran	0:55a05330f8cc	16	* 1. Redistributions of source code must retain the above copyright notice,
darran	0:55a05330f8cc	17	* this list of conditions and the following disclaimer.
darran	0:55a05330f8cc	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
darran	0:55a05330f8cc	19	* this list of conditions and the following disclaimer in the documentation
darran	0:55a05330f8cc	20	* and/or other materials provided with the distribution.
darran	0:55a05330f8cc	21	* 3. The name of the author may not be used to endorse or promote products
darran	0:55a05330f8cc	22	* derived from this software without specific prior written permission.
darran	0:55a05330f8cc	23	*
darran	0:55a05330f8cc	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
darran	0:55a05330f8cc	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
darran	0:55a05330f8cc	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
darran	0:55a05330f8cc	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
darran	0:55a05330f8cc	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
darran	0:55a05330f8cc	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
darran	0:55a05330f8cc	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
darran	0:55a05330f8cc	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
darran	0:55a05330f8cc	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
darran	0:55a05330f8cc	33	* OF SUCH DAMAGE.
darran	0:55a05330f8cc	34	*
darran	0:55a05330f8cc	35	* This file is a contribution to the lwIP TCP/IP stack.
darran	0:55a05330f8cc	36	* The Swedish Institute of Computer Science and Adam Dunkels
darran	0:55a05330f8cc	37	* are specifically granted permission to redistribute this
darran	0:55a05330f8cc	38	* source code.
darran	0:55a05330f8cc	39	*
darran	0:55a05330f8cc	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
darran	0:55a05330f8cc	41	*
darran	0:55a05330f8cc	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
darran	0:55a05330f8cc	43	* with RFC 2131 and RFC 2132.
darran	0:55a05330f8cc	44	*
darran	0:55a05330f8cc	45	* TODO:
darran	0:55a05330f8cc	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
darran	0:55a05330f8cc	47	*
darran	0:55a05330f8cc	48	* Please coordinate changes and requests with Leon Woestenberg
darran	0:55a05330f8cc	49	* <leon.woestenberg@gmx.net>
darran	0:55a05330f8cc	50	*
darran	0:55a05330f8cc	51	* Integration with your code:
darran	0:55a05330f8cc	52	*
darran	0:55a05330f8cc	53	* In lwip/dhcp.h
darran	0:55a05330f8cc	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
darran	0:55a05330f8cc	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
darran	0:55a05330f8cc	56	*
darran	0:55a05330f8cc	57	* Then have your application call dhcp_coarse_tmr() and
darran	0:55a05330f8cc	58	* dhcp_fine_tmr() on the defined intervals.
darran	0:55a05330f8cc	59	*
darran	0:55a05330f8cc	60	* dhcp_start(struct netif *netif);
darran	0:55a05330f8cc	61	* starts a DHCP client instance which configures the interface by
darran	0:55a05330f8cc	62	* obtaining an IP address lease and maintaining it.
darran	0:55a05330f8cc	63	*
darran	0:55a05330f8cc	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
darran	0:55a05330f8cc	65	* to remove the DHCP client.
darran	0:55a05330f8cc	66	*
darran	0:55a05330f8cc	67	*/
darran	0:55a05330f8cc	68
darran	0:55a05330f8cc	69	#include "lwip/opt.h"
darran	0:55a05330f8cc	70
darran	0:55a05330f8cc	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
darran	0:55a05330f8cc	72
darran	0:55a05330f8cc	73	#include "lwip/stats.h"
darran	0:55a05330f8cc	74	#include "lwip/mem.h"
darran	0:55a05330f8cc	75	#include "lwip/udp.h"
darran	0:55a05330f8cc	76	#include "lwip/ip_addr.h"
darran	0:55a05330f8cc	77	#include "lwip/netif.h"
darran	0:55a05330f8cc	78	#include "lwip/def.h"
darran	0:55a05330f8cc	79	#include "lwip/sys.h"
darran	0:55a05330f8cc	80	#include "lwip/dhcp.h"
darran	0:55a05330f8cc	81	#include "lwip/autoip.h"
darran	0:55a05330f8cc	82	#include "lwip/dns.h"
darran	0:55a05330f8cc	83	#include "netif/etharp.h"
darran	0:55a05330f8cc	84
darran	0:55a05330f8cc	85	#include <string.h>
darran	0:55a05330f8cc	86
darran	0:55a05330f8cc	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
darran	0:55a05330f8cc	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
darran	0:55a05330f8cc	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
darran	0:55a05330f8cc	90	* #define DHCP_GLOBAL_XID rand()
darran	0:55a05330f8cc	91	*/
darran	0:55a05330f8cc	92	#ifdef DHCP_GLOBAL_XID_HEADER
darran	0:55a05330f8cc	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
darran	0:55a05330f8cc	94	#endif
darran	0:55a05330f8cc	95
darran	0:55a05330f8cc	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
darran	0:55a05330f8cc	97	* MTU is checked to be big enough in dhcp_start */
darran	0:55a05330f8cc	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
darran	0:55a05330f8cc	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
darran	0:55a05330f8cc	100	/** Minimum length for reply before packet is parsed */
darran	0:55a05330f8cc	101	#define DHCP_MIN_REPLY_LEN 44
darran	0:55a05330f8cc	102
darran	0:55a05330f8cc	103	#define REBOOT_TRIES 2
darran	0:55a05330f8cc	104
darran	0:55a05330f8cc	105	/** Option handling: options are parsed in dhcp_parse_reply
darran	0:55a05330f8cc	106	* and saved in an array where other functions can load them from.
darran	0:55a05330f8cc	107	* This might be moved into the struct dhcp (not necessarily since
darran	0:55a05330f8cc	108	* lwIP is single-threaded and the array is only used while in recv
darran	0:55a05330f8cc	109	* callback). */
darran	0:55a05330f8cc	110	#define DHCP_OPTION_IDX_OVERLOAD 0
darran	0:55a05330f8cc	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
darran	0:55a05330f8cc	112	#define DHCP_OPTION_IDX_SERVER_ID 2
darran	0:55a05330f8cc	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
darran	0:55a05330f8cc	114	#define DHCP_OPTION_IDX_T1 4
darran	0:55a05330f8cc	115	#define DHCP_OPTION_IDX_T2 5
darran	0:55a05330f8cc	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
darran	0:55a05330f8cc	117	#define DHCP_OPTION_IDX_ROUTER 7
darran	0:55a05330f8cc	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
darran	0:55a05330f8cc	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
darran	0:55a05330f8cc	120
darran	0:55a05330f8cc	121	/** Holds the decoded option values, only valid while in dhcp_recv.
darran	0:55a05330f8cc	122	@todo: move this into struct dhcp? */
darran	0:55a05330f8cc	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
darran	0:55a05330f8cc	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
darran	0:55a05330f8cc	125	only valid while in dhcp_recv.
darran	0:55a05330f8cc	126	@todo: move this into struct dhcp? */
darran	0:55a05330f8cc	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
darran	0:55a05330f8cc	128
darran	0:55a05330f8cc	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
darran	0:55a05330f8cc	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
darran	0:55a05330f8cc	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
darran	0:55a05330f8cc	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
darran	0:55a05330f8cc	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
darran	0:55a05330f8cc	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
darran	0:55a05330f8cc	135
darran	0:55a05330f8cc	136
darran	0:55a05330f8cc	137	/* DHCP client state machine functions */
darran	0:55a05330f8cc	138	static err_t dhcp_discover(struct netif *netif);
darran	0:55a05330f8cc	139	static err_t dhcp_select(struct netif *netif);
darran	0:55a05330f8cc	140	static void dhcp_bind(struct netif *netif);
darran	0:55a05330f8cc	141	#if DHCP_DOES_ARP_CHECK
darran	0:55a05330f8cc	142	static err_t dhcp_decline(struct netif *netif);
darran	0:55a05330f8cc	143	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:55a05330f8cc	144	static err_t dhcp_rebind(struct netif *netif);
darran	0:55a05330f8cc	145	static err_t dhcp_reboot(struct netif *netif);
darran	0:55a05330f8cc	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
darran	0:55a05330f8cc	147
darran	0:55a05330f8cc	148	/* receive, unfold, parse and free incoming messages */
darran	0:55a05330f8cc	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
darran	0:55a05330f8cc	150
darran	0:55a05330f8cc	151	/* set the DHCP timers */
darran	0:55a05330f8cc	152	static void dhcp_timeout(struct netif *netif);
darran	0:55a05330f8cc	153	static void dhcp_t1_timeout(struct netif *netif);
darran	0:55a05330f8cc	154	static void dhcp_t2_timeout(struct netif *netif);
darran	0:55a05330f8cc	155
darran	0:55a05330f8cc	156	/* build outgoing messages */
darran	0:55a05330f8cc	157	/* create a DHCP message, fill in common headers */
darran	0:55a05330f8cc	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
darran	0:55a05330f8cc	159	/* free a DHCP request */
darran	0:55a05330f8cc	160	static void dhcp_delete_msg(struct dhcp *dhcp);
darran	0:55a05330f8cc	161	/* add a DHCP option (type, then length in bytes) */
darran	0:55a05330f8cc	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
darran	0:55a05330f8cc	163	/* add option values */
darran	0:55a05330f8cc	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
darran	0:55a05330f8cc	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
darran	0:55a05330f8cc	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
darran	0:55a05330f8cc	167	/* always add the DHCP options trailer to end and pad */
darran	0:55a05330f8cc	168	static void dhcp_option_trailer(struct dhcp *dhcp);
darran	0:55a05330f8cc	169
darran	0:55a05330f8cc	170	/**
darran	0:55a05330f8cc	171	* Back-off the DHCP client (because of a received NAK response).
darran	0:55a05330f8cc	172	*
darran	0:55a05330f8cc	173	* Back-off the DHCP client because of a received NAK. Receiving a
darran	0:55a05330f8cc	174	* NAK means the client asked for something non-sensible, for
darran	0:55a05330f8cc	175	* example when it tries to renew a lease obtained on another network.
darran	0:55a05330f8cc	176	*
darran	0:55a05330f8cc	177	* We clear any existing set IP address and restart DHCP negotiation
darran	0:55a05330f8cc	178	* afresh (as per RFC2131 3.2.3).
darran	0:55a05330f8cc	179	*
darran	0:55a05330f8cc	180	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	181	*/
darran	0:55a05330f8cc	182	static void
darran	0:55a05330f8cc	183	dhcp_handle_nak(struct netif *netif)
darran	0:55a05330f8cc	184	{
darran	0:55a05330f8cc	185	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
darran	0:55a05330f8cc	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
darran	0:55a05330f8cc	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
darran	0:55a05330f8cc	189	netif_set_down(netif);
darran	0:55a05330f8cc	190	/* remove IP address from interface */
darran	0:55a05330f8cc	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
darran	0:55a05330f8cc	192	netif_set_gw(netif, IP_ADDR_ANY);
darran	0:55a05330f8cc	193	netif_set_netmask(netif, IP_ADDR_ANY);
darran	0:55a05330f8cc	194	/* Change to a defined state */
darran	0:55a05330f8cc	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
darran	0:55a05330f8cc	196	/* We can immediately restart discovery */
darran	0:55a05330f8cc	197	dhcp_discover(netif);
darran	0:55a05330f8cc	198	}
darran	0:55a05330f8cc	199
darran	0:55a05330f8cc	200	#if DHCP_DOES_ARP_CHECK
darran	0:55a05330f8cc	201	/**
darran	0:55a05330f8cc	202	* Checks if the offered IP address is already in use.
darran	0:55a05330f8cc	203	*
darran	0:55a05330f8cc	204	* It does so by sending an ARP request for the offered address and
darran	0:55a05330f8cc	205	* entering CHECKING state. If no ARP reply is received within a small
darran	0:55a05330f8cc	206	* interval, the address is assumed to be free for use by us.
darran	0:55a05330f8cc	207	*
darran	0:55a05330f8cc	208	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	209	*/
darran	0:55a05330f8cc	210	static void
darran	0:55a05330f8cc	211	dhcp_check(struct netif *netif)
darran	0:55a05330f8cc	212	{
darran	0:55a05330f8cc	213	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	214	err_t result;
darran	0:55a05330f8cc	215	u16_t msecs;
darran	0:55a05330f8cc	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
darran	0:55a05330f8cc	217	(s16_t)netif->name[1]));
darran	0:55a05330f8cc	218	dhcp_set_state(dhcp, DHCP_CHECKING);
darran	0:55a05330f8cc	219	/* create an ARP query for the offered IP address, expecting that no host
darran	0:55a05330f8cc	220	responds, as the IP address should not be in use. */
darran	0:55a05330f8cc	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
darran	0:55a05330f8cc	222	if (result != ERR_OK) {
darran	0:55a05330f8cc	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
darran	0:55a05330f8cc	224	}
darran	0:55a05330f8cc	225	dhcp->tries++;
darran	0:55a05330f8cc	226	msecs = 500;
darran	0:55a05330f8cc	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	229	}
darran	0:55a05330f8cc	230	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:55a05330f8cc	231
darran	0:55a05330f8cc	232	/**
darran	0:55a05330f8cc	233	* Remember the configuration offered by a DHCP server.
darran	0:55a05330f8cc	234	*
darran	0:55a05330f8cc	235	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	236	*/
darran	0:55a05330f8cc	237	static void
darran	0:55a05330f8cc	238	dhcp_handle_offer(struct netif *netif)
darran	0:55a05330f8cc	239	{
darran	0:55a05330f8cc	240	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
darran	0:55a05330f8cc	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
darran	0:55a05330f8cc	243	/* obtain the server address */
darran	0:55a05330f8cc	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
darran	0:55a05330f8cc	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
darran	0:55a05330f8cc	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
darran	0:55a05330f8cc	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
darran	0:55a05330f8cc	248	/* remember offered address */
darran	0:55a05330f8cc	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
darran	0:55a05330f8cc	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
darran	0:55a05330f8cc	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:55a05330f8cc	252
darran	0:55a05330f8cc	253	dhcp_select(netif);
darran	0:55a05330f8cc	254	} else {
darran	0:55a05330f8cc	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:55a05330f8cc	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
darran	0:55a05330f8cc	257	}
darran	0:55a05330f8cc	258	}
darran	0:55a05330f8cc	259
darran	0:55a05330f8cc	260	/**
darran	0:55a05330f8cc	261	* Select a DHCP server offer out of all offers.
darran	0:55a05330f8cc	262	*
darran	0:55a05330f8cc	263	* Simply select the first offer received.
darran	0:55a05330f8cc	264	*
darran	0:55a05330f8cc	265	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	266	* @return lwIP specific error (see error.h)
darran	0:55a05330f8cc	267	*/
darran	0:55a05330f8cc	268	static err_t
darran	0:55a05330f8cc	269	dhcp_select(struct netif *netif)
darran	0:55a05330f8cc	270	{
darran	0:55a05330f8cc	271	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	272	err_t result;
darran	0:55a05330f8cc	273	u16_t msecs;
darran	0:55a05330f8cc	274
darran	0:55a05330f8cc	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	0:55a05330f8cc	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
darran	0:55a05330f8cc	277
darran	0:55a05330f8cc	278	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:55a05330f8cc	280	if (result == ERR_OK) {
darran	0:55a05330f8cc	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:55a05330f8cc	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:55a05330f8cc	283
darran	0:55a05330f8cc	284	/* MUST request the offered IP address */
darran	0:55a05330f8cc	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:55a05330f8cc	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:55a05330f8cc	287
darran	0:55a05330f8cc	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
darran	0:55a05330f8cc	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
darran	0:55a05330f8cc	290
darran	0:55a05330f8cc	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
darran	0:55a05330f8cc	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
darran	0:55a05330f8cc	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
darran	0:55a05330f8cc	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
darran	0:55a05330f8cc	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
darran	0:55a05330f8cc	296
darran	0:55a05330f8cc	297	#if LWIP_NETIF_HOSTNAME
darran	0:55a05330f8cc	298	if (netif->hostname != NULL) {
darran	0:55a05330f8cc	299	const char p = (const char)netif->hostname;
darran	0:55a05330f8cc	300	u8_t namelen = (u8_t)strlen(p);
darran	0:55a05330f8cc	301	if (namelen > 0) {
darran	0:55a05330f8cc	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
darran	0:55a05330f8cc	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
darran	0:55a05330f8cc	304	while (*p) {
darran	0:55a05330f8cc	305	dhcp_option_byte(dhcp, *p++);
darran	0:55a05330f8cc	306	}
darran	0:55a05330f8cc	307	}
darran	0:55a05330f8cc	308	}
darran	0:55a05330f8cc	309	#endif /* LWIP_NETIF_HOSTNAME */
darran	0:55a05330f8cc	310
darran	0:55a05330f8cc	311	dhcp_option_trailer(dhcp);
darran	0:55a05330f8cc	312	/* shrink the pbuf to the actual content length */
darran	0:55a05330f8cc	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:55a05330f8cc	314
darran	0:55a05330f8cc	315	/* send broadcast to any DHCP server */
darran	0:55a05330f8cc	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	317	dhcp_delete_msg(dhcp);
darran	0:55a05330f8cc	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
darran	0:55a05330f8cc	319	} else {
darran	0:55a05330f8cc	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	321	}
darran	0:55a05330f8cc	322	dhcp->tries++;
darran	0:55a05330f8cc	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
darran	0:55a05330f8cc	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	326	return result;
darran	0:55a05330f8cc	327	}
darran	0:55a05330f8cc	328
darran	0:55a05330f8cc	329	/**
darran	0:55a05330f8cc	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
darran	0:55a05330f8cc	331	*/
darran	0:55a05330f8cc	332	void
darran	0:55a05330f8cc	333	dhcp_coarse_tmr()
darran	0:55a05330f8cc	334	{
darran	0:55a05330f8cc	335	struct netif *netif = netif_list;
darran	0:55a05330f8cc	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
darran	0:55a05330f8cc	337	/* iterate through all network interfaces */
darran	0:55a05330f8cc	338	while (netif != NULL) {
darran	0:55a05330f8cc	339	/* only act on DHCP configured interfaces */
darran	0:55a05330f8cc	340	if (netif->dhcp != NULL) {
darran	0:55a05330f8cc	341	/* timer is active (non zero), and triggers (zeroes) now? */
darran	0:55a05330f8cc	342	if (netif->dhcp->t2_timeout-- == 1) {
darran	0:55a05330f8cc	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
darran	0:55a05330f8cc	344	/* this clients' rebind timeout triggered */
darran	0:55a05330f8cc	345	dhcp_t2_timeout(netif);
darran	0:55a05330f8cc	346	/* timer is active (non zero), and triggers (zeroes) now */
darran	0:55a05330f8cc	347	} else if (netif->dhcp->t1_timeout-- == 1) {
darran	0:55a05330f8cc	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
darran	0:55a05330f8cc	349	/* this clients' renewal timeout triggered */
darran	0:55a05330f8cc	350	dhcp_t1_timeout(netif);
darran	0:55a05330f8cc	351	}
darran	0:55a05330f8cc	352	}
darran	0:55a05330f8cc	353	/* proceed to next netif */
darran	0:55a05330f8cc	354	netif = netif->next;
darran	0:55a05330f8cc	355	}
darran	0:55a05330f8cc	356	}
darran	0:55a05330f8cc	357
darran	0:55a05330f8cc	358	/**
darran	0:55a05330f8cc	359	* DHCP transaction timeout handling
darran	0:55a05330f8cc	360	*
darran	0:55a05330f8cc	361	* A DHCP server is expected to respond within a short period of time.
darran	0:55a05330f8cc	362	* This timer checks whether an outstanding DHCP request is timed out.
darran	0:55a05330f8cc	363	*/
darran	0:55a05330f8cc	364	void
darran	0:55a05330f8cc	365	dhcp_fine_tmr()
darran	0:55a05330f8cc	366	{
darran	0:55a05330f8cc	367	struct netif *netif = netif_list;
darran	0:55a05330f8cc	368	/* loop through netif's */
darran	0:55a05330f8cc	369	while (netif != NULL) {
darran	0:55a05330f8cc	370	/* only act on DHCP configured interfaces */
darran	0:55a05330f8cc	371	if (netif->dhcp != NULL) {
darran	0:55a05330f8cc	372	/* timer is active (non zero), and is about to trigger now */
darran	0:55a05330f8cc	373	if (netif->dhcp->request_timeout > 1) {
darran	0:55a05330f8cc	374	netif->dhcp->request_timeout--;
darran	0:55a05330f8cc	375	}
darran	0:55a05330f8cc	376	else if (netif->dhcp->request_timeout == 1) {
darran	0:55a05330f8cc	377	netif->dhcp->request_timeout--;
darran	0:55a05330f8cc	378	/* { netif->dhcp->request_timeout == 0 } */
darran	0:55a05330f8cc	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
darran	0:55a05330f8cc	380	/* this client's request timeout triggered */
darran	0:55a05330f8cc	381	dhcp_timeout(netif);
darran	0:55a05330f8cc	382	}
darran	0:55a05330f8cc	383	}
darran	0:55a05330f8cc	384	/* proceed to next network interface */
darran	0:55a05330f8cc	385	netif = netif->next;
darran	0:55a05330f8cc	386	}
darran	0:55a05330f8cc	387	}
darran	0:55a05330f8cc	388
darran	0:55a05330f8cc	389	/**
darran	0:55a05330f8cc	390	* A DHCP negotiation transaction, or ARP request, has timed out.
darran	0:55a05330f8cc	391	*
darran	0:55a05330f8cc	392	* The timer that was started with the DHCP or ARP request has
darran	0:55a05330f8cc	393	* timed out, indicating no response was received in time.
darran	0:55a05330f8cc	394	*
darran	0:55a05330f8cc	395	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	396	*/
darran	0:55a05330f8cc	397	static void
darran	0:55a05330f8cc	398	dhcp_timeout(struct netif *netif)
darran	0:55a05330f8cc	399	{
darran	0:55a05330f8cc	400	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
darran	0:55a05330f8cc	402	/* back-off period has passed, or server selection timed out */
darran	0:55a05330f8cc	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
darran	0:55a05330f8cc	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
darran	0:55a05330f8cc	405	dhcp_discover(netif);
darran	0:55a05330f8cc	406	/* receiving the requested lease timed out */
darran	0:55a05330f8cc	407	} else if (dhcp->state == DHCP_REQUESTING) {
darran	0:55a05330f8cc	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
darran	0:55a05330f8cc	409	if (dhcp->tries <= 5) {
darran	0:55a05330f8cc	410	dhcp_select(netif);
darran	0:55a05330f8cc	411	} else {
darran	0:55a05330f8cc	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
darran	0:55a05330f8cc	413	dhcp_release(netif);
darran	0:55a05330f8cc	414	dhcp_discover(netif);
darran	0:55a05330f8cc	415	}
darran	0:55a05330f8cc	416	#if DHCP_DOES_ARP_CHECK
darran	0:55a05330f8cc	417	/* received no ARP reply for the offered address (which is good) */
darran	0:55a05330f8cc	418	} else if (dhcp->state == DHCP_CHECKING) {
darran	0:55a05330f8cc	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
darran	0:55a05330f8cc	420	if (dhcp->tries <= 1) {
darran	0:55a05330f8cc	421	dhcp_check(netif);
darran	0:55a05330f8cc	422	/* no ARP replies on the offered address,
darran	0:55a05330f8cc	423	looks like the IP address is indeed free */
darran	0:55a05330f8cc	424	} else {
darran	0:55a05330f8cc	425	/* bind the interface to the offered address */
darran	0:55a05330f8cc	426	dhcp_bind(netif);
darran	0:55a05330f8cc	427	}
darran	0:55a05330f8cc	428	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:55a05330f8cc	429	}
darran	0:55a05330f8cc	430	/* did not get response to renew request? */
darran	0:55a05330f8cc	431	else if (dhcp->state == DHCP_RENEWING) {
darran	0:55a05330f8cc	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
darran	0:55a05330f8cc	433	/* just retry renewal */
darran	0:55a05330f8cc	434	/* note that the rebind timer will eventually time-out if renew does not work */
darran	0:55a05330f8cc	435	dhcp_renew(netif);
darran	0:55a05330f8cc	436	/* did not get response to rebind request? */
darran	0:55a05330f8cc	437	} else if (dhcp->state == DHCP_REBINDING) {
darran	0:55a05330f8cc	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
darran	0:55a05330f8cc	439	if (dhcp->tries <= 8) {
darran	0:55a05330f8cc	440	dhcp_rebind(netif);
darran	0:55a05330f8cc	441	} else {
darran	0:55a05330f8cc	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
darran	0:55a05330f8cc	443	dhcp_release(netif);
darran	0:55a05330f8cc	444	dhcp_discover(netif);
darran	0:55a05330f8cc	445	}
darran	0:55a05330f8cc	446	} else if (dhcp->state == DHCP_REBOOTING) {
darran	0:55a05330f8cc	447	if (dhcp->tries < REBOOT_TRIES) {
darran	0:55a05330f8cc	448	dhcp_reboot(netif);
darran	0:55a05330f8cc	449	} else {
darran	0:55a05330f8cc	450	dhcp_discover(netif);
darran	0:55a05330f8cc	451	}
darran	0:55a05330f8cc	452	}
darran	0:55a05330f8cc	453	}
darran	0:55a05330f8cc	454
darran	0:55a05330f8cc	455	/**
darran	0:55a05330f8cc	456	* The renewal period has timed out.
darran	0:55a05330f8cc	457	*
darran	0:55a05330f8cc	458	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	459	*/
darran	0:55a05330f8cc	460	static void
darran	0:55a05330f8cc	461	dhcp_t1_timeout(struct netif *netif)
darran	0:55a05330f8cc	462	{
darran	0:55a05330f8cc	463	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
darran	0:55a05330f8cc	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
darran	0:55a05330f8cc	466	(dhcp->state == DHCP_RENEWING)) {
darran	0:55a05330f8cc	467	/* just retry to renew - note that the rebind timer (t2) will
darran	0:55a05330f8cc	468	* eventually time-out if renew tries fail. */
darran	0:55a05330f8cc	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	470	("dhcp_t1_timeout(): must renew\n"));
darran	0:55a05330f8cc	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
darran	0:55a05330f8cc	472	DHCP_RENEWING, not DHCP_BOUND */
darran	0:55a05330f8cc	473	dhcp_renew(netif);
darran	0:55a05330f8cc	474	}
darran	0:55a05330f8cc	475	}
darran	0:55a05330f8cc	476
darran	0:55a05330f8cc	477	/**
darran	0:55a05330f8cc	478	* The rebind period has timed out.
darran	0:55a05330f8cc	479	*
darran	0:55a05330f8cc	480	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	481	*/
darran	0:55a05330f8cc	482	static void
darran	0:55a05330f8cc	483	dhcp_t2_timeout(struct netif *netif)
darran	0:55a05330f8cc	484	{
darran	0:55a05330f8cc	485	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
darran	0:55a05330f8cc	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
darran	0:55a05330f8cc	488	(dhcp->state == DHCP_RENEWING)) {
darran	0:55a05330f8cc	489	/* just retry to rebind */
darran	0:55a05330f8cc	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:55a05330f8cc	491	("dhcp_t2_timeout(): must rebind\n"));
darran	0:55a05330f8cc	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
darran	0:55a05330f8cc	493	DHCP_REBINDING, not DHCP_BOUND */
darran	0:55a05330f8cc	494	dhcp_rebind(netif);
darran	0:55a05330f8cc	495	}
darran	0:55a05330f8cc	496	}
darran	0:55a05330f8cc	497
darran	0:55a05330f8cc	498	/**
darran	0:55a05330f8cc	499	* Handle a DHCP ACK packet
darran	0:55a05330f8cc	500	*
darran	0:55a05330f8cc	501	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	502	*/
darran	0:55a05330f8cc	503	static void
darran	0:55a05330f8cc	504	dhcp_handle_ack(struct netif *netif)
darran	0:55a05330f8cc	505	{
darran	0:55a05330f8cc	506	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	507	#if LWIP_DNS
darran	0:55a05330f8cc	508	u8_t n;
darran	0:55a05330f8cc	509	#endif /* LWIP_DNS */
darran	0:55a05330f8cc	510
darran	0:55a05330f8cc	511	/* clear options we might not get from the ACK */
darran	0:55a05330f8cc	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
darran	0:55a05330f8cc	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
darran	0:55a05330f8cc	514	#if LWIP_DHCP_BOOTP_FILE
darran	0:55a05330f8cc	515	ip_addr_set_zero(&dhcp->offered_si_addr);
darran	0:55a05330f8cc	516	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:55a05330f8cc	517
darran	0:55a05330f8cc	518	/* lease time given? */
darran	0:55a05330f8cc	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
darran	0:55a05330f8cc	520	/* remember offered lease time */
darran	0:55a05330f8cc	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
darran	0:55a05330f8cc	522	}
darran	0:55a05330f8cc	523	/* renewal period given? */
darran	0:55a05330f8cc	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
darran	0:55a05330f8cc	525	/* remember given renewal period */
darran	0:55a05330f8cc	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
darran	0:55a05330f8cc	527	} else {
darran	0:55a05330f8cc	528	/* calculate safe periods for renewal */
darran	0:55a05330f8cc	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
darran	0:55a05330f8cc	530	}
darran	0:55a05330f8cc	531
darran	0:55a05330f8cc	532	/* renewal period given? */
darran	0:55a05330f8cc	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
darran	0:55a05330f8cc	534	/* remember given rebind period */
darran	0:55a05330f8cc	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
darran	0:55a05330f8cc	536	} else {
darran	0:55a05330f8cc	537	/* calculate safe periods for rebinding */
darran	0:55a05330f8cc	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
darran	0:55a05330f8cc	539	}
darran	0:55a05330f8cc	540
darran	0:55a05330f8cc	541	/* (y)our internet address */
darran	0:55a05330f8cc	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
darran	0:55a05330f8cc	543
darran	0:55a05330f8cc	544	#if LWIP_DHCP_BOOTP_FILE
darran	0:55a05330f8cc	545	/* copy boot server address,
darran	0:55a05330f8cc	546	boot file name copied in dhcp_parse_reply if not overloaded */
darran	0:55a05330f8cc	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
darran	0:55a05330f8cc	548	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:55a05330f8cc	549
darran	0:55a05330f8cc	550	/* subnet mask given? */
darran	0:55a05330f8cc	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
darran	0:55a05330f8cc	552	/* remember given subnet mask */
darran	0:55a05330f8cc	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
darran	0:55a05330f8cc	554	dhcp->subnet_mask_given = 1;
darran	0:55a05330f8cc	555	} else {
darran	0:55a05330f8cc	556	dhcp->subnet_mask_given = 0;
darran	0:55a05330f8cc	557	}
darran	0:55a05330f8cc	558
darran	0:55a05330f8cc	559	/* gateway router */
darran	0:55a05330f8cc	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
darran	0:55a05330f8cc	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
darran	0:55a05330f8cc	562	}
darran	0:55a05330f8cc	563
darran	0:55a05330f8cc	564	#if LWIP_DNS
darran	0:55a05330f8cc	565	/* DNS servers */
darran	0:55a05330f8cc	566	n = 0;
darran	0:55a05330f8cc	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
darran	0:55a05330f8cc	568	ip_addr_t dns_addr;
darran	0:55a05330f8cc	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
darran	0:55a05330f8cc	570	dns_setserver(n, &dns_addr);
darran	0:55a05330f8cc	571	n++;
darran	0:55a05330f8cc	572	}
darran	0:55a05330f8cc	573	#endif /* LWIP_DNS */
darran	0:55a05330f8cc	574	}
darran	0:55a05330f8cc	575
darran	0:55a05330f8cc	576	/** Set a statically allocated struct dhcp to work with.
darran	0:55a05330f8cc	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
darran	0:55a05330f8cc	578	*
darran	0:55a05330f8cc	579	* @param netif the netif for which to set the struct dhcp
darran	0:55a05330f8cc	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
darran	0:55a05330f8cc	581	*/
darran	0:55a05330f8cc	582	void
darran	0:55a05330f8cc	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
darran	0:55a05330f8cc	584	{
darran	0:55a05330f8cc	585	LWIP_ASSERT("netif != NULL", netif != NULL);
darran	0:55a05330f8cc	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
darran	0:55a05330f8cc	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
darran	0:55a05330f8cc	588
darran	0:55a05330f8cc	589	/* clear data structure */
darran	0:55a05330f8cc	590	memset(dhcp, 0, sizeof(struct dhcp));
darran	0:55a05330f8cc	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
darran	0:55a05330f8cc	592	netif->dhcp = dhcp;
darran	0:55a05330f8cc	593	}
darran	0:55a05330f8cc	594
darran	0:55a05330f8cc	595	/**
darran	0:55a05330f8cc	596	* Start DHCP negotiation for a network interface.
darran	0:55a05330f8cc	597	*
darran	0:55a05330f8cc	598	* If no DHCP client instance was attached to this interface,
darran	0:55a05330f8cc	599	* a new client is created first. If a DHCP client instance
darran	0:55a05330f8cc	600	* was already present, it restarts negotiation.
darran	0:55a05330f8cc	601	*
darran	0:55a05330f8cc	602	* @param netif The lwIP network interface
darran	0:55a05330f8cc	603	* @return lwIP error code
darran	0:55a05330f8cc	604	* - ERR_OK - No error
darran	0:55a05330f8cc	605	* - ERR_MEM - Out of memory
darran	0:55a05330f8cc	606	*/
darran	0:55a05330f8cc	607	err_t
darran	0:55a05330f8cc	608	dhcp_start(struct netif *netif)
darran	0:55a05330f8cc	609	{
darran	0:55a05330f8cc	610	struct dhcp *dhcp;
darran	0:55a05330f8cc	611	err_t result = ERR_OK;
darran	0:55a05330f8cc	612
darran	0:55a05330f8cc	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
darran	0:55a05330f8cc	614	dhcp = netif->dhcp;
darran	0:55a05330f8cc	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	0:55a05330f8cc	616	/* Remove the flag that says this netif is handled by DHCP,
darran	0:55a05330f8cc	617	it is set when we succeeded starting. */
darran	0:55a05330f8cc	618	netif->flags &= ~NETIF_FLAG_DHCP;
darran	0:55a05330f8cc	619
darran	0:55a05330f8cc	620	/* check hwtype of the netif */
darran	0:55a05330f8cc	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
darran	0:55a05330f8cc	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
darran	0:55a05330f8cc	623	return ERR_ARG;
darran	0:55a05330f8cc	624	}
darran	0:55a05330f8cc	625
darran	0:55a05330f8cc	626	/* check MTU of the netif */
darran	0:55a05330f8cc	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
darran	0:55a05330f8cc	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
darran	0:55a05330f8cc	629	return ERR_MEM;
darran	0:55a05330f8cc	630	}
darran	0:55a05330f8cc	631
darran	0:55a05330f8cc	632	/* no DHCP client attached yet? */
darran	0:55a05330f8cc	633	if (dhcp == NULL) {
darran	0:55a05330f8cc	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
darran	0:55a05330f8cc	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
darran	0:55a05330f8cc	636	if (dhcp == NULL) {
darran	0:55a05330f8cc	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
darran	0:55a05330f8cc	638	return ERR_MEM;
darran	0:55a05330f8cc	639	}
darran	0:55a05330f8cc	640	/* store this dhcp client in the netif */
darran	0:55a05330f8cc	641	netif->dhcp = dhcp;
darran	0:55a05330f8cc	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
darran	0:55a05330f8cc	643	/* already has DHCP client attached */
darran	0:55a05330f8cc	644	} else {
darran	0:55a05330f8cc	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
darran	0:55a05330f8cc	646	if (dhcp->pcb != NULL) {
darran	0:55a05330f8cc	647	udp_remove(dhcp->pcb);
darran	0:55a05330f8cc	648	}
darran	0:55a05330f8cc	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
darran	0:55a05330f8cc	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
darran	0:55a05330f8cc	651	}
darran	0:55a05330f8cc	652
darran	0:55a05330f8cc	653	/* clear data structure */
darran	0:55a05330f8cc	654	memset(dhcp, 0, sizeof(struct dhcp));
darran	0:55a05330f8cc	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
darran	0:55a05330f8cc	656	/* allocate UDP PCB */
darran	0:55a05330f8cc	657	dhcp->pcb = udp_new();
darran	0:55a05330f8cc	658	if (dhcp->pcb == NULL) {
darran	0:55a05330f8cc	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
darran	0:55a05330f8cc	660	return ERR_MEM;
darran	0:55a05330f8cc	661	}
darran	0:55a05330f8cc	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
darran	0:55a05330f8cc	663	/* set up local and remote port for the pcb */
darran	0:55a05330f8cc	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
darran	0:55a05330f8cc	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
darran	0:55a05330f8cc	666	/* set up the recv callback and argument */
darran	0:55a05330f8cc	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
darran	0:55a05330f8cc	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
darran	0:55a05330f8cc	669	/* (re)start the DHCP negotiation */
darran	0:55a05330f8cc	670	result = dhcp_discover(netif);
darran	0:55a05330f8cc	671	if (result != ERR_OK) {
darran	0:55a05330f8cc	672	/* free resources allocated above */
darran	0:55a05330f8cc	673	dhcp_stop(netif);
darran	0:55a05330f8cc	674	return ERR_MEM;
darran	0:55a05330f8cc	675	}
darran	0:55a05330f8cc	676	/* Set the flag that says this netif is handled by DHCP. */
darran	0:55a05330f8cc	677	netif->flags \|= NETIF_FLAG_DHCP;
darran	0:55a05330f8cc	678	return result;
darran	0:55a05330f8cc	679	}
darran	0:55a05330f8cc	680
darran	0:55a05330f8cc	681	/**
darran	0:55a05330f8cc	682	* Inform a DHCP server of our manual configuration.
darran	0:55a05330f8cc	683	*
darran	0:55a05330f8cc	684	* This informs DHCP servers of our fixed IP address configuration
darran	0:55a05330f8cc	685	* by sending an INFORM message. It does not involve DHCP address
darran	0:55a05330f8cc	686	* configuration, it is just here to be nice to the network.
darran	0:55a05330f8cc	687	*
darran	0:55a05330f8cc	688	* @param netif The lwIP network interface
darran	0:55a05330f8cc	689	*/
darran	0:55a05330f8cc	690	void
darran	0:55a05330f8cc	691	dhcp_inform(struct netif *netif)
darran	0:55a05330f8cc	692	{
darran	0:55a05330f8cc	693	struct dhcp dhcp;
darran	0:55a05330f8cc	694	err_t result = ERR_OK;
darran	0:55a05330f8cc	695	struct udp_pcb *pcb;
darran	0:55a05330f8cc	696
darran	0:55a05330f8cc	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
darran	0:55a05330f8cc	698
darran	0:55a05330f8cc	699	memset(&dhcp, 0, sizeof(struct dhcp));
darran	0:55a05330f8cc	700	dhcp_set_state(&dhcp, DHCP_INFORM);
darran	0:55a05330f8cc	701
darran	0:55a05330f8cc	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
darran	0:55a05330f8cc	703	/* re-use existing pcb */
darran	0:55a05330f8cc	704	pcb = netif->dhcp->pcb;
darran	0:55a05330f8cc	705	} else {
darran	0:55a05330f8cc	706	pcb = udp_new();
darran	0:55a05330f8cc	707	if (pcb == NULL) {
darran	0:55a05330f8cc	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
darran	0:55a05330f8cc	709	return;
darran	0:55a05330f8cc	710	}
darran	0:55a05330f8cc	711	dhcp.pcb = pcb;
darran	0:55a05330f8cc	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
darran	0:55a05330f8cc	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
darran	0:55a05330f8cc	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
darran	0:55a05330f8cc	715	}
darran	0:55a05330f8cc	716	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
darran	0:55a05330f8cc	718	if (result == ERR_OK) {
darran	0:55a05330f8cc	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:55a05330f8cc	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:55a05330f8cc	721
darran	0:55a05330f8cc	722	dhcp_option_trailer(&dhcp);
darran	0:55a05330f8cc	723
darran	0:55a05330f8cc	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
darran	0:55a05330f8cc	725
darran	0:55a05330f8cc	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
darran	0:55a05330f8cc	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	728	dhcp_delete_msg(&dhcp);
darran	0:55a05330f8cc	729	} else {
darran	0:55a05330f8cc	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	731	}
darran	0:55a05330f8cc	732
darran	0:55a05330f8cc	733	if (dhcp.pcb != NULL) {
darran	0:55a05330f8cc	734	/* otherwise, the existing pcb was used */
darran	0:55a05330f8cc	735	udp_remove(dhcp.pcb);
darran	0:55a05330f8cc	736	}
darran	0:55a05330f8cc	737	}
darran	0:55a05330f8cc	738
darran	0:55a05330f8cc	739	/** Handle a possible change in the network configuration.
darran	0:55a05330f8cc	740	*
darran	0:55a05330f8cc	741	* This enters the REBOOTING state to verify that the currently bound
darran	0:55a05330f8cc	742	* address is still valid.
darran	0:55a05330f8cc	743	*/
darran	0:55a05330f8cc	744	void
darran	0:55a05330f8cc	745	dhcp_network_changed(struct netif *netif)
darran	0:55a05330f8cc	746	{
darran	0:55a05330f8cc	747	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	748	if (!dhcp)
darran	0:55a05330f8cc	749	return;
darran	0:55a05330f8cc	750	switch (dhcp->state) {
darran	0:55a05330f8cc	751	case DHCP_REBINDING:
darran	0:55a05330f8cc	752	case DHCP_RENEWING:
darran	0:55a05330f8cc	753	case DHCP_BOUND:
darran	0:55a05330f8cc	754	case DHCP_REBOOTING:
darran	0:55a05330f8cc	755	netif_set_down(netif);
darran	0:55a05330f8cc	756	dhcp->tries = 0;
darran	0:55a05330f8cc	757	dhcp_reboot(netif);
darran	0:55a05330f8cc	758	break;
darran	0:55a05330f8cc	759	case DHCP_OFF:
darran	0:55a05330f8cc	760	/* stay off */
darran	0:55a05330f8cc	761	break;
darran	0:55a05330f8cc	762	default:
darran	0:55a05330f8cc	763	dhcp->tries = 0;
darran	0:55a05330f8cc	764	dhcp_discover(netif);
darran	0:55a05330f8cc	765	break;
darran	0:55a05330f8cc	766	}
darran	0:55a05330f8cc	767	}
darran	0:55a05330f8cc	768
darran	0:55a05330f8cc	769	#if DHCP_DOES_ARP_CHECK
darran	0:55a05330f8cc	770	/**
darran	0:55a05330f8cc	771	* Match an ARP reply with the offered IP address.
darran	0:55a05330f8cc	772	*
darran	0:55a05330f8cc	773	* @param netif the network interface on which the reply was received
darran	0:55a05330f8cc	774	* @param addr The IP address we received a reply from
darran	0:55a05330f8cc	775	*/
darran	0:55a05330f8cc	776	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
darran	0:55a05330f8cc	777	{
darran	0:55a05330f8cc	778	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
darran	0:55a05330f8cc	779	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
darran	0:55a05330f8cc	780	/* is a DHCP client doing an ARP check? */
darran	0:55a05330f8cc	781	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
darran	0:55a05330f8cc	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
darran	0:55a05330f8cc	783	ip4_addr_get_u32(addr)));
darran	0:55a05330f8cc	784	/* did a host respond with the address we
darran	0:55a05330f8cc	785	were offered by the DHCP server? */
darran	0:55a05330f8cc	786	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
darran	0:55a05330f8cc	787	/* we will not accept the offered address */
darran	0:55a05330f8cc	788	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
darran	0:55a05330f8cc	789	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
darran	0:55a05330f8cc	790	dhcp_decline(netif);
darran	0:55a05330f8cc	791	}
darran	0:55a05330f8cc	792	}
darran	0:55a05330f8cc	793	}
darran	0:55a05330f8cc	794
darran	0:55a05330f8cc	795	/**
darran	0:55a05330f8cc	796	* Decline an offered lease.
darran	0:55a05330f8cc	797	*
darran	0:55a05330f8cc	798	* Tell the DHCP server we do not accept the offered address.
darran	0:55a05330f8cc	799	* One reason to decline the lease is when we find out the address
darran	0:55a05330f8cc	800	* is already in use by another host (through ARP).
darran	0:55a05330f8cc	801	*
darran	0:55a05330f8cc	802	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	803	*/
darran	0:55a05330f8cc	804	static err_t
darran	0:55a05330f8cc	805	dhcp_decline(struct netif *netif)
darran	0:55a05330f8cc	806	{
darran	0:55a05330f8cc	807	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	808	err_t result = ERR_OK;
darran	0:55a05330f8cc	809	u16_t msecs;
darran	0:55a05330f8cc	810	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
darran	0:55a05330f8cc	811	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
darran	0:55a05330f8cc	812	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	813	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
darran	0:55a05330f8cc	814	if (result == ERR_OK) {
darran	0:55a05330f8cc	815	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:55a05330f8cc	816	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:55a05330f8cc	817
darran	0:55a05330f8cc	818	dhcp_option_trailer(dhcp);
darran	0:55a05330f8cc	819	/* resize pbuf to reflect true size of options */
darran	0:55a05330f8cc	820	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:55a05330f8cc	821
darran	0:55a05330f8cc	822	/* per section 4.4.4, broadcast DECLINE messages */
darran	0:55a05330f8cc	823	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	824	dhcp_delete_msg(dhcp);
darran	0:55a05330f8cc	825	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
darran	0:55a05330f8cc	826	} else {
darran	0:55a05330f8cc	827	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:55a05330f8cc	828	("dhcp_decline: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	829	}
darran	0:55a05330f8cc	830	dhcp->tries++;
darran	0:55a05330f8cc	831	msecs = 10*1000;
darran	0:55a05330f8cc	832	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	833	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	834	return result;
darran	0:55a05330f8cc	835	}
darran	0:55a05330f8cc	836	#endif /* DHCP_DOES_ARP_CHECK */
darran	0:55a05330f8cc	837
darran	0:55a05330f8cc	838
darran	0:55a05330f8cc	839	/**
darran	0:55a05330f8cc	840	* Start the DHCP process, discover a DHCP server.
darran	0:55a05330f8cc	841	*
darran	0:55a05330f8cc	842	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	843	*/
darran	0:55a05330f8cc	844	static err_t
darran	0:55a05330f8cc	845	dhcp_discover(struct netif *netif)
darran	0:55a05330f8cc	846	{
darran	0:55a05330f8cc	847	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	848	err_t result = ERR_OK;
darran	0:55a05330f8cc	849	u16_t msecs;
darran	0:55a05330f8cc	850	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
darran	0:55a05330f8cc	851	ip_addr_set_any(&dhcp->offered_ip_addr);
darran	0:55a05330f8cc	852	dhcp_set_state(dhcp, DHCP_SELECTING);
darran	0:55a05330f8cc	853	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	854	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
darran	0:55a05330f8cc	855	if (result == ERR_OK) {
darran	0:55a05330f8cc	856	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
darran	0:55a05330f8cc	857
darran	0:55a05330f8cc	858	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:55a05330f8cc	859	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:55a05330f8cc	860
darran	0:55a05330f8cc	861	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
darran	0:55a05330f8cc	862	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
darran	0:55a05330f8cc	863	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
darran	0:55a05330f8cc	864	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
darran	0:55a05330f8cc	865	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
darran	0:55a05330f8cc	866
darran	0:55a05330f8cc	867	dhcp_option_trailer(dhcp);
darran	0:55a05330f8cc	868
darran	0:55a05330f8cc	869	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
darran	0:55a05330f8cc	870	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:55a05330f8cc	871
darran	0:55a05330f8cc	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
darran	0:55a05330f8cc	873	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	874	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
darran	0:55a05330f8cc	875	dhcp_delete_msg(dhcp);
darran	0:55a05330f8cc	876	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
darran	0:55a05330f8cc	877	} else {
darran	0:55a05330f8cc	878	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	879	}
darran	0:55a05330f8cc	880	dhcp->tries++;
darran	0:55a05330f8cc	881	#if LWIP_DHCP_AUTOIP_COOP
darran	0:55a05330f8cc	882	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
darran	0:55a05330f8cc	883	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
darran	0:55a05330f8cc	884	autoip_start(netif);
darran	0:55a05330f8cc	885	}
darran	0:55a05330f8cc	886	#endif /* LWIP_DHCP_AUTOIP_COOP */
darran	0:55a05330f8cc	887	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
darran	0:55a05330f8cc	888	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	889	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	890	return result;
darran	0:55a05330f8cc	891	}
darran	0:55a05330f8cc	892
darran	0:55a05330f8cc	893
darran	0:55a05330f8cc	894	/**
darran	0:55a05330f8cc	895	* Bind the interface to the offered IP address.
darran	0:55a05330f8cc	896	*
darran	0:55a05330f8cc	897	* @param netif network interface to bind to the offered address
darran	0:55a05330f8cc	898	*/
darran	0:55a05330f8cc	899	static void
darran	0:55a05330f8cc	900	dhcp_bind(struct netif *netif)
darran	0:55a05330f8cc	901	{
darran	0:55a05330f8cc	902	u32_t timeout;
darran	0:55a05330f8cc	903	struct dhcp *dhcp;
darran	0:55a05330f8cc	904	ip_addr_t sn_mask, gw_addr;
darran	0:55a05330f8cc	905	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
darran	0:55a05330f8cc	906	dhcp = netif->dhcp;
darran	0:55a05330f8cc	907	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
darran	0:55a05330f8cc	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	0:55a05330f8cc	909
darran	0:55a05330f8cc	910	/* temporary DHCP lease? */
darran	0:55a05330f8cc	911	if (dhcp->offered_t1_renew != 0xffffffffUL) {
darran	0:55a05330f8cc	912	/* set renewal period timer */
darran	0:55a05330f8cc	913	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
darran	0:55a05330f8cc	914	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
darran	0:55a05330f8cc	915	if(timeout > 0xffff) {
darran	0:55a05330f8cc	916	timeout = 0xffff;
darran	0:55a05330f8cc	917	}
darran	0:55a05330f8cc	918	dhcp->t1_timeout = (u16_t)timeout;
darran	0:55a05330f8cc	919	if (dhcp->t1_timeout == 0) {
darran	0:55a05330f8cc	920	dhcp->t1_timeout = 1;
darran	0:55a05330f8cc	921	}
darran	0:55a05330f8cc	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	0:55a05330f8cc	923	}
darran	0:55a05330f8cc	924	/* set renewal period timer */
darran	0:55a05330f8cc	925	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
darran	0:55a05330f8cc	926	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
darran	0:55a05330f8cc	927	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
darran	0:55a05330f8cc	928	if(timeout > 0xffff) {
darran	0:55a05330f8cc	929	timeout = 0xffff;
darran	0:55a05330f8cc	930	}
darran	0:55a05330f8cc	931	dhcp->t2_timeout = (u16_t)timeout;
darran	0:55a05330f8cc	932	if (dhcp->t2_timeout == 0) {
darran	0:55a05330f8cc	933	dhcp->t2_timeout = 1;
darran	0:55a05330f8cc	934	}
darran	0:55a05330f8cc	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	0:55a05330f8cc	936	}
darran	0:55a05330f8cc	937
darran	0:55a05330f8cc	938	if (dhcp->subnet_mask_given) {
darran	0:55a05330f8cc	939	/* copy offered network mask */
darran	0:55a05330f8cc	940	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
darran	0:55a05330f8cc	941	} else {
darran	0:55a05330f8cc	942	/* subnet mask not given, choose a safe subnet mask given the network class */
darran	0:55a05330f8cc	943	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
darran	0:55a05330f8cc	944	if (first_octet <= 127) {
darran	0:55a05330f8cc	945	ip4_addr_set_u32(&sn_mask, htonl(0xff000000));
darran	0:55a05330f8cc	946	} else if (first_octet >= 192) {
darran	0:55a05330f8cc	947	ip4_addr_set_u32(&sn_mask, htonl(0xffffff00));
darran	0:55a05330f8cc	948	} else {
darran	0:55a05330f8cc	949	ip4_addr_set_u32(&sn_mask, htonl(0xffff0000));
darran	0:55a05330f8cc	950	}
darran	0:55a05330f8cc	951	}
darran	0:55a05330f8cc	952
darran	0:55a05330f8cc	953	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
darran	0:55a05330f8cc	954	/* gateway address not given? */
darran	0:55a05330f8cc	955	if (ip_addr_isany(&gw_addr)) {
darran	0:55a05330f8cc	956	/* copy network address */
darran	0:55a05330f8cc	957	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
darran	0:55a05330f8cc	958	/* use first host address on network as gateway */
darran	0:55a05330f8cc	959	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| htonl(0x00000001));
darran	0:55a05330f8cc	960	}
darran	0:55a05330f8cc	961
darran	0:55a05330f8cc	962	#if LWIP_DHCP_AUTOIP_COOP
darran	0:55a05330f8cc	963	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
darran	0:55a05330f8cc	964	autoip_stop(netif);
darran	0:55a05330f8cc	965	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
darran	0:55a05330f8cc	966	}
darran	0:55a05330f8cc	967	#endif /* LWIP_DHCP_AUTOIP_COOP */
darran	0:55a05330f8cc	968
darran	0:55a05330f8cc	969	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
darran	0:55a05330f8cc	970	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:55a05330f8cc	971	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
darran	0:55a05330f8cc	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
darran	0:55a05330f8cc	973	ip4_addr_get_u32(&sn_mask)));
darran	0:55a05330f8cc	974	netif_set_netmask(netif, &sn_mask);
darran	0:55a05330f8cc	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
darran	0:55a05330f8cc	976	ip4_addr_get_u32(&gw_addr)));
darran	0:55a05330f8cc	977	netif_set_gw(netif, &gw_addr);
darran	0:55a05330f8cc	978	/* bring the interface up */
darran	0:55a05330f8cc	979	netif_set_up(netif);
darran	0:55a05330f8cc	980	/* netif is now bound to DHCP leased address */
darran	0:55a05330f8cc	981	dhcp_set_state(dhcp, DHCP_BOUND);
darran	0:55a05330f8cc	982	}
darran	0:55a05330f8cc	983
darran	0:55a05330f8cc	984	/**
darran	0:55a05330f8cc	985	* Renew an existing DHCP lease at the involved DHCP server.
darran	0:55a05330f8cc	986	*
darran	0:55a05330f8cc	987	* @param netif network interface which must renew its lease
darran	0:55a05330f8cc	988	*/
darran	0:55a05330f8cc	989	err_t
darran	0:55a05330f8cc	990	dhcp_renew(struct netif *netif)
darran	0:55a05330f8cc	991	{
darran	0:55a05330f8cc	992	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	993	err_t result;
darran	0:55a05330f8cc	994	u16_t msecs;
darran	0:55a05330f8cc	995	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
darran	0:55a05330f8cc	996	dhcp_set_state(dhcp, DHCP_RENEWING);
darran	0:55a05330f8cc	997
darran	0:55a05330f8cc	998	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	999	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:55a05330f8cc	1000	if (result == ERR_OK) {
darran	0:55a05330f8cc	1001	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:55a05330f8cc	1002	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:55a05330f8cc	1003
darran	0:55a05330f8cc	1004	#if LWIP_NETIF_HOSTNAME
darran	0:55a05330f8cc	1005	if (netif->hostname != NULL) {
darran	0:55a05330f8cc	1006	const char p = (const char)netif->hostname;
darran	0:55a05330f8cc	1007	u8_t namelen = (u8_t)strlen(p);
darran	0:55a05330f8cc	1008	if (namelen > 0) {
darran	0:55a05330f8cc	1009	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
darran	0:55a05330f8cc	1010	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
darran	0:55a05330f8cc	1011	while (*p) {
darran	0:55a05330f8cc	1012	dhcp_option_byte(dhcp, *p++);
darran	0:55a05330f8cc	1013	}
darran	0:55a05330f8cc	1014	}
darran	0:55a05330f8cc	1015	}
darran	0:55a05330f8cc	1016	#endif /* LWIP_NETIF_HOSTNAME */
darran	0:55a05330f8cc	1017
darran	0:55a05330f8cc	1018	#if 0
darran	0:55a05330f8cc	1019	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:55a05330f8cc	1020	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
darran	0:55a05330f8cc	1021	#endif
darran	0:55a05330f8cc	1022
darran	0:55a05330f8cc	1023	#if 0
darran	0:55a05330f8cc	1024	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
darran	0:55a05330f8cc	1025	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
darran	0:55a05330f8cc	1026	#endif
darran	0:55a05330f8cc	1027	/* append DHCP message trailer */
darran	0:55a05330f8cc	1028	dhcp_option_trailer(dhcp);
darran	0:55a05330f8cc	1029
darran	0:55a05330f8cc	1030	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:55a05330f8cc	1031
darran	0:55a05330f8cc	1032	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	1033	dhcp_delete_msg(dhcp);
darran	0:55a05330f8cc	1034
darran	0:55a05330f8cc	1035	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
darran	0:55a05330f8cc	1036	} else {
darran	0:55a05330f8cc	1037	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	1038	}
darran	0:55a05330f8cc	1039	dhcp->tries++;
darran	0:55a05330f8cc	1040	/* back-off on retries, but to a maximum of 20 seconds */
darran	0:55a05330f8cc	1041	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
darran	0:55a05330f8cc	1042	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	1043	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	1044	return result;
darran	0:55a05330f8cc	1045	}
darran	0:55a05330f8cc	1046
darran	0:55a05330f8cc	1047	/**
darran	0:55a05330f8cc	1048	* Rebind with a DHCP server for an existing DHCP lease.
darran	0:55a05330f8cc	1049	*
darran	0:55a05330f8cc	1050	* @param netif network interface which must rebind with a DHCP server
darran	0:55a05330f8cc	1051	*/
darran	0:55a05330f8cc	1052	static err_t
darran	0:55a05330f8cc	1053	dhcp_rebind(struct netif *netif)
darran	0:55a05330f8cc	1054	{
darran	0:55a05330f8cc	1055	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	1056	err_t result;
darran	0:55a05330f8cc	1057	u16_t msecs;
darran	0:55a05330f8cc	1058	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
darran	0:55a05330f8cc	1059	dhcp_set_state(dhcp, DHCP_REBINDING);
darran	0:55a05330f8cc	1060
darran	0:55a05330f8cc	1061	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	1062	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:55a05330f8cc	1063	if (result == ERR_OK) {
darran	0:55a05330f8cc	1064	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:55a05330f8cc	1065	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
darran	0:55a05330f8cc	1066
darran	0:55a05330f8cc	1067	#if LWIP_NETIF_HOSTNAME
darran	0:55a05330f8cc	1068	if (netif->hostname != NULL) {
darran	0:55a05330f8cc	1069	const char p = (const char)netif->hostname;
darran	0:55a05330f8cc	1070	u8_t namelen = (u8_t)strlen(p);
darran	0:55a05330f8cc	1071	if (namelen > 0) {
darran	0:55a05330f8cc	1072	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
darran	0:55a05330f8cc	1073	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
darran	0:55a05330f8cc	1074	while (*p) {
darran	0:55a05330f8cc	1075	dhcp_option_byte(dhcp, *p++);
darran	0:55a05330f8cc	1076	}
darran	0:55a05330f8cc	1077	}
darran	0:55a05330f8cc	1078	}
darran	0:55a05330f8cc	1079	#endif /* LWIP_NETIF_HOSTNAME */
darran	0:55a05330f8cc	1080
darran	0:55a05330f8cc	1081	#if 0
darran	0:55a05330f8cc	1082	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:55a05330f8cc	1083	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
darran	0:55a05330f8cc	1084
darran	0:55a05330f8cc	1085	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
darran	0:55a05330f8cc	1086	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
darran	0:55a05330f8cc	1087	#endif
darran	0:55a05330f8cc	1088
darran	0:55a05330f8cc	1089	dhcp_option_trailer(dhcp);
darran	0:55a05330f8cc	1090
darran	0:55a05330f8cc	1091	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:55a05330f8cc	1092
darran	0:55a05330f8cc	1093	/* broadcast to server */
darran	0:55a05330f8cc	1094	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	1095	dhcp_delete_msg(dhcp);
darran	0:55a05330f8cc	1096	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
darran	0:55a05330f8cc	1097	} else {
darran	0:55a05330f8cc	1098	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	1099	}
darran	0:55a05330f8cc	1100	dhcp->tries++;
darran	0:55a05330f8cc	1101	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
darran	0:55a05330f8cc	1102	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	1103	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	1104	return result;
darran	0:55a05330f8cc	1105	}
darran	0:55a05330f8cc	1106
darran	0:55a05330f8cc	1107	/**
darran	0:55a05330f8cc	1108	* Enter REBOOTING state to verify an existing lease
darran	0:55a05330f8cc	1109	*
darran	0:55a05330f8cc	1110	* @param netif network interface which must reboot
darran	0:55a05330f8cc	1111	*/
darran	0:55a05330f8cc	1112	static err_t
darran	0:55a05330f8cc	1113	dhcp_reboot(struct netif *netif)
darran	0:55a05330f8cc	1114	{
darran	0:55a05330f8cc	1115	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	1116	err_t result;
darran	0:55a05330f8cc	1117	u16_t msecs;
darran	0:55a05330f8cc	1118	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
darran	0:55a05330f8cc	1119	dhcp_set_state(dhcp, DHCP_REBOOTING);
darran	0:55a05330f8cc	1120
darran	0:55a05330f8cc	1121	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	1122	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
darran	0:55a05330f8cc	1123	if (result == ERR_OK) {
darran	0:55a05330f8cc	1124	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
darran	0:55a05330f8cc	1125	dhcp_option_short(dhcp, 576);
darran	0:55a05330f8cc	1126
darran	0:55a05330f8cc	1127	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
darran	0:55a05330f8cc	1128	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
darran	0:55a05330f8cc	1129
darran	0:55a05330f8cc	1130	dhcp_option_trailer(dhcp);
darran	0:55a05330f8cc	1131
darran	0:55a05330f8cc	1132	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:55a05330f8cc	1133
darran	0:55a05330f8cc	1134	/* broadcast to server */
darran	0:55a05330f8cc	1135	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	1136	dhcp_delete_msg(dhcp);
darran	0:55a05330f8cc	1137	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
darran	0:55a05330f8cc	1138	} else {
darran	0:55a05330f8cc	1139	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	1140	}
darran	0:55a05330f8cc	1141	dhcp->tries++;
darran	0:55a05330f8cc	1142	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
darran	0:55a05330f8cc	1143	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	1144	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	1145	return result;
darran	0:55a05330f8cc	1146	}
darran	0:55a05330f8cc	1147
darran	0:55a05330f8cc	1148
darran	0:55a05330f8cc	1149	/**
darran	0:55a05330f8cc	1150	* Release a DHCP lease.
darran	0:55a05330f8cc	1151	*
darran	0:55a05330f8cc	1152	* @param netif network interface which must release its lease
darran	0:55a05330f8cc	1153	*/
darran	0:55a05330f8cc	1154	err_t
darran	0:55a05330f8cc	1155	dhcp_release(struct netif *netif)
darran	0:55a05330f8cc	1156	{
darran	0:55a05330f8cc	1157	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	1158	err_t result;
darran	0:55a05330f8cc	1159	u16_t msecs;
darran	0:55a05330f8cc	1160	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
darran	0:55a05330f8cc	1161
darran	0:55a05330f8cc	1162	/* idle DHCP client */
darran	0:55a05330f8cc	1163	dhcp_set_state(dhcp, DHCP_OFF);
darran	0:55a05330f8cc	1164	/* clean old DHCP offer */
darran	0:55a05330f8cc	1165	ip_addr_set_zero(&dhcp->server_ip_addr);
darran	0:55a05330f8cc	1166	ip_addr_set_zero(&dhcp->offered_ip_addr);
darran	0:55a05330f8cc	1167	ip_addr_set_zero(&dhcp->offered_sn_mask);
darran	0:55a05330f8cc	1168	ip_addr_set_zero(&dhcp->offered_gw_addr);
darran	0:55a05330f8cc	1169	#if LWIP_DHCP_BOOTP_FILE
darran	0:55a05330f8cc	1170	ip_addr_set_zero(&dhcp->offered_si_addr);
darran	0:55a05330f8cc	1171	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:55a05330f8cc	1172	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
darran	0:55a05330f8cc	1173
darran	0:55a05330f8cc	1174	/* create and initialize the DHCP message header */
darran	0:55a05330f8cc	1175	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
darran	0:55a05330f8cc	1176	if (result == ERR_OK) {
darran	0:55a05330f8cc	1177	dhcp_option_trailer(dhcp);
darran	0:55a05330f8cc	1178
darran	0:55a05330f8cc	1179	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
darran	0:55a05330f8cc	1180
darran	0:55a05330f8cc	1181	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
darran	0:55a05330f8cc	1182	dhcp_delete_msg(dhcp);
darran	0:55a05330f8cc	1183	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
darran	0:55a05330f8cc	1184	} else {
darran	0:55a05330f8cc	1185	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
darran	0:55a05330f8cc	1186	}
darran	0:55a05330f8cc	1187	dhcp->tries++;
darran	0:55a05330f8cc	1188	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
darran	0:55a05330f8cc	1189	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
darran	0:55a05330f8cc	1190	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
darran	0:55a05330f8cc	1191	/* bring the interface down */
darran	0:55a05330f8cc	1192	netif_set_down(netif);
darran	0:55a05330f8cc	1193	/* remove IP address from interface */
darran	0:55a05330f8cc	1194	netif_set_ipaddr(netif, IP_ADDR_ANY);
darran	0:55a05330f8cc	1195	netif_set_gw(netif, IP_ADDR_ANY);
darran	0:55a05330f8cc	1196	netif_set_netmask(netif, IP_ADDR_ANY);
darran	0:55a05330f8cc	1197
darran	0:55a05330f8cc	1198	return result;
darran	0:55a05330f8cc	1199	}
darran	0:55a05330f8cc	1200
darran	0:55a05330f8cc	1201	/**
darran	0:55a05330f8cc	1202	* Remove the DHCP client from the interface.
darran	0:55a05330f8cc	1203	*
darran	0:55a05330f8cc	1204	* @param netif The network interface to stop DHCP on
darran	0:55a05330f8cc	1205	*/
darran	0:55a05330f8cc	1206	void
darran	0:55a05330f8cc	1207	dhcp_stop(struct netif *netif)
darran	0:55a05330f8cc	1208	{
darran	0:55a05330f8cc	1209	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	1210	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
darran	0:55a05330f8cc	1211	/* Remove the flag that says this netif is handled by DHCP. */
darran	0:55a05330f8cc	1212	netif->flags &= ~NETIF_FLAG_DHCP;
darran	0:55a05330f8cc	1213
darran	0:55a05330f8cc	1214	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
darran	0:55a05330f8cc	1215	/* netif is DHCP configured? */
darran	0:55a05330f8cc	1216	if (dhcp != NULL) {
darran	0:55a05330f8cc	1217	#if LWIP_DHCP_AUTOIP_COOP
darran	0:55a05330f8cc	1218	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
darran	0:55a05330f8cc	1219	autoip_stop(netif);
darran	0:55a05330f8cc	1220	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
darran	0:55a05330f8cc	1221	}
darran	0:55a05330f8cc	1222	#endif /* LWIP_DHCP_AUTOIP_COOP */
darran	0:55a05330f8cc	1223
darran	0:55a05330f8cc	1224	if (dhcp->pcb != NULL) {
darran	0:55a05330f8cc	1225	udp_remove(dhcp->pcb);
darran	0:55a05330f8cc	1226	dhcp->pcb = NULL;
darran	0:55a05330f8cc	1227	}
darran	0:55a05330f8cc	1228	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
darran	0:55a05330f8cc	1229	dhcp_set_state(dhcp, DHCP_OFF);
darran	0:55a05330f8cc	1230	}
darran	0:55a05330f8cc	1231	}
darran	0:55a05330f8cc	1232
darran	0:55a05330f8cc	1233	/*
darran	0:55a05330f8cc	1234	* Set the DHCP state of a DHCP client.
darran	0:55a05330f8cc	1235	*
darran	0:55a05330f8cc	1236	* If the state changed, reset the number of tries.
darran	0:55a05330f8cc	1237	*/
darran	0:55a05330f8cc	1238	static void
darran	0:55a05330f8cc	1239	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
darran	0:55a05330f8cc	1240	{
darran	0:55a05330f8cc	1241	if (new_state != dhcp->state) {
darran	0:55a05330f8cc	1242	dhcp->state = new_state;
darran	0:55a05330f8cc	1243	dhcp->tries = 0;
darran	0:55a05330f8cc	1244	dhcp->request_timeout = 0;
darran	0:55a05330f8cc	1245	}
darran	0:55a05330f8cc	1246	}
darran	0:55a05330f8cc	1247
darran	0:55a05330f8cc	1248	/*
darran	0:55a05330f8cc	1249	* Concatenate an option type and length field to the outgoing
darran	0:55a05330f8cc	1250	* DHCP message.
darran	0:55a05330f8cc	1251	*
darran	0:55a05330f8cc	1252	*/
darran	0:55a05330f8cc	1253	static void
darran	0:55a05330f8cc	1254	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
darran	0:55a05330f8cc	1255	{
darran	0:55a05330f8cc	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	0:55a05330f8cc	1257	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
darran	0:55a05330f8cc	1258	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
darran	0:55a05330f8cc	1259	}
darran	0:55a05330f8cc	1260	/*
darran	0:55a05330f8cc	1261	* Concatenate a single byte to the outgoing DHCP message.
darran	0:55a05330f8cc	1262	*
darran	0:55a05330f8cc	1263	*/
darran	0:55a05330f8cc	1264	static void
darran	0:55a05330f8cc	1265	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
darran	0:55a05330f8cc	1266	{
darran	0:55a05330f8cc	1267	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
darran	0:55a05330f8cc	1268	dhcp->msg_out->options[dhcp->options_out_len++] = value;
darran	0:55a05330f8cc	1269	}
darran	0:55a05330f8cc	1270
darran	0:55a05330f8cc	1271	static void
darran	0:55a05330f8cc	1272	dhcp_option_short(struct dhcp *dhcp, u16_t value)
darran	0:55a05330f8cc	1273	{
darran	0:55a05330f8cc	1274	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
darran	0:55a05330f8cc	1275	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
darran	0:55a05330f8cc	1276	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
darran	0:55a05330f8cc	1277	}
darran	0:55a05330f8cc	1278
darran	0:55a05330f8cc	1279	static void
darran	0:55a05330f8cc	1280	dhcp_option_long(struct dhcp *dhcp, u32_t value)
darran	0:55a05330f8cc	1281	{
darran	0:55a05330f8cc	1282	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
darran	0:55a05330f8cc	1283	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
darran	0:55a05330f8cc	1284	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
darran	0:55a05330f8cc	1285	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
darran	0:55a05330f8cc	1286	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
darran	0:55a05330f8cc	1287	}
darran	0:55a05330f8cc	1288
darran	0:55a05330f8cc	1289	/**
darran	0:55a05330f8cc	1290	* Extract the DHCP message and the DHCP options.
darran	0:55a05330f8cc	1291	*
darran	0:55a05330f8cc	1292	* Extract the DHCP message and the DHCP options, each into a contiguous
darran	0:55a05330f8cc	1293	* piece of memory. As a DHCP message is variable sized by its options,
darran	0:55a05330f8cc	1294	* and also allows overriding some fields for options, the easy approach
darran	0:55a05330f8cc	1295	* is to first unfold the options into a conitguous piece of memory, and
darran	0:55a05330f8cc	1296	* use that further on.
darran	0:55a05330f8cc	1297	*
darran	0:55a05330f8cc	1298	*/
darran	0:55a05330f8cc	1299	static err_t
darran	0:55a05330f8cc	1300	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
darran	0:55a05330f8cc	1301	{
darran	0:55a05330f8cc	1302	u8_t *options;
darran	0:55a05330f8cc	1303	u16_t offset;
darran	0:55a05330f8cc	1304	u16_t offset_max;
darran	0:55a05330f8cc	1305	u16_t options_idx;
darran	0:55a05330f8cc	1306	u16_t options_idx_max;
darran	0:55a05330f8cc	1307	struct pbuf *q;
darran	0:55a05330f8cc	1308	int parse_file_as_options = 0;
darran	0:55a05330f8cc	1309	int parse_sname_as_options = 0;
darran	0:55a05330f8cc	1310
darran	0:55a05330f8cc	1311	/* clear received options */
darran	0:55a05330f8cc	1312	dhcp_clear_all_options(dhcp);
darran	0:55a05330f8cc	1313	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
darran	0:55a05330f8cc	1314	if (p->len < DHCP_SNAME_OFS) {
darran	0:55a05330f8cc	1315	return ERR_BUF;
darran	0:55a05330f8cc	1316	}
darran	0:55a05330f8cc	1317	dhcp->msg_in = (struct dhcp_msg *)p->payload;
darran	0:55a05330f8cc	1318	#if LWIP_DHCP_BOOTP_FILE
darran	0:55a05330f8cc	1319	/* clear boot file name */
darran	0:55a05330f8cc	1320	dhcp->boot_file_name[0] = 0;
darran	0:55a05330f8cc	1321	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:55a05330f8cc	1322
darran	0:55a05330f8cc	1323	/* parse options */
darran	0:55a05330f8cc	1324
darran	0:55a05330f8cc	1325	/* start with options field */
darran	0:55a05330f8cc	1326	options_idx = DHCP_OPTIONS_OFS;
darran	0:55a05330f8cc	1327	/* parse options to the end of the received packet */
darran	0:55a05330f8cc	1328	options_idx_max = p->tot_len;
darran	0:55a05330f8cc	1329	again:
darran	0:55a05330f8cc	1330	q = p;
darran	0:55a05330f8cc	1331	while((q != NULL) && (options_idx >= q->len)) {
darran	0:55a05330f8cc	1332	options_idx -= q->len;
darran	0:55a05330f8cc	1333	options_idx_max -= q->len;
darran	0:55a05330f8cc	1334	q = q->next;
darran	0:55a05330f8cc	1335	}
darran	0:55a05330f8cc	1336	if (q == NULL) {
darran	0:55a05330f8cc	1337	return ERR_BUF;
darran	0:55a05330f8cc	1338	}
darran	0:55a05330f8cc	1339	offset = options_idx;
darran	0:55a05330f8cc	1340	offset_max = options_idx_max;
darran	0:55a05330f8cc	1341	options = (u8_t*)q->payload;
darran	0:55a05330f8cc	1342	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
darran	0:55a05330f8cc	1343	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
darran	0:55a05330f8cc	1344	u8_t op = options[offset];
darran	0:55a05330f8cc	1345	u8_t len;
darran	0:55a05330f8cc	1346	u8_t decode_len = 0;
darran	0:55a05330f8cc	1347	int decode_idx = -1;
darran	0:55a05330f8cc	1348	u16_t val_offset = offset + 2;
darran	0:55a05330f8cc	1349	/* len byte might be in the next pbuf */
darran	0:55a05330f8cc	1350	if (offset + 1 < q->len) {
darran	0:55a05330f8cc	1351	len = options[offset + 1];
darran	0:55a05330f8cc	1352	} else {
darran	0:55a05330f8cc	1353	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
darran	0:55a05330f8cc	1354	}
darran	0:55a05330f8cc	1355	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
darran	0:55a05330f8cc	1356	decode_len = len;
darran	0:55a05330f8cc	1357	switch(op) {
darran	0:55a05330f8cc	1358	/* case(DHCP_OPTION_END): handled above */
darran	0:55a05330f8cc	1359	case(DHCP_OPTION_PAD):
darran	0:55a05330f8cc	1360	/* special option: no len encoded */
darran	0:55a05330f8cc	1361	decode_len = len = 0;
darran	0:55a05330f8cc	1362	/* will be increased below */
darran	0:55a05330f8cc	1363	offset--;
darran	0:55a05330f8cc	1364	break;
darran	0:55a05330f8cc	1365	case(DHCP_OPTION_SUBNET_MASK):
darran	0:55a05330f8cc	1366	LWIP_ASSERT("len == 4", len == 4);
darran	0:55a05330f8cc	1367	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
darran	0:55a05330f8cc	1368	break;
darran	0:55a05330f8cc	1369	case(DHCP_OPTION_ROUTER):
darran	0:55a05330f8cc	1370	decode_len = 4; /* only copy the first given router */
darran	0:55a05330f8cc	1371	LWIP_ASSERT("len >= decode_len", len >= decode_len);
darran	0:55a05330f8cc	1372	decode_idx = DHCP_OPTION_IDX_ROUTER;
darran	0:55a05330f8cc	1373	break;
darran	0:55a05330f8cc	1374	case(DHCP_OPTION_DNS_SERVER):
darran	0:55a05330f8cc	1375	/* special case: there might be more than one server */
darran	0:55a05330f8cc	1376	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
darran	0:55a05330f8cc	1377	/* limit number of DNS servers */
darran	0:55a05330f8cc	1378	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
darran	0:55a05330f8cc	1379	LWIP_ASSERT("len >= decode_len", len >= decode_len);
darran	0:55a05330f8cc	1380	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
darran	0:55a05330f8cc	1381	break;
darran	0:55a05330f8cc	1382	case(DHCP_OPTION_LEASE_TIME):
darran	0:55a05330f8cc	1383	LWIP_ASSERT("len == 4", len == 4);
darran	0:55a05330f8cc	1384	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
darran	0:55a05330f8cc	1385	break;
darran	0:55a05330f8cc	1386	case(DHCP_OPTION_OVERLOAD):
darran	0:55a05330f8cc	1387	LWIP_ASSERT("len == 1", len == 1);
darran	0:55a05330f8cc	1388	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
darran	0:55a05330f8cc	1389	break;
darran	0:55a05330f8cc	1390	case(DHCP_OPTION_MESSAGE_TYPE):
darran	0:55a05330f8cc	1391	LWIP_ASSERT("len == 1", len == 1);
darran	0:55a05330f8cc	1392	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
darran	0:55a05330f8cc	1393	break;
darran	0:55a05330f8cc	1394	case(DHCP_OPTION_SERVER_ID):
darran	0:55a05330f8cc	1395	LWIP_ASSERT("len == 4", len == 4);
darran	0:55a05330f8cc	1396	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
darran	0:55a05330f8cc	1397	break;
darran	0:55a05330f8cc	1398	case(DHCP_OPTION_T1):
darran	0:55a05330f8cc	1399	LWIP_ASSERT("len == 4", len == 4);
darran	0:55a05330f8cc	1400	decode_idx = DHCP_OPTION_IDX_T1;
darran	0:55a05330f8cc	1401	break;
darran	0:55a05330f8cc	1402	case(DHCP_OPTION_T2):
darran	0:55a05330f8cc	1403	LWIP_ASSERT("len == 4", len == 4);
darran	0:55a05330f8cc	1404	decode_idx = DHCP_OPTION_IDX_T2;
darran	0:55a05330f8cc	1405	break;
darran	0:55a05330f8cc	1406	default:
darran	0:55a05330f8cc	1407	decode_len = 0;
darran	0:55a05330f8cc	1408	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
darran	0:55a05330f8cc	1409	break;
darran	0:55a05330f8cc	1410	}
darran	0:55a05330f8cc	1411	offset += len + 2;
darran	0:55a05330f8cc	1412	if (decode_len > 0) {
darran	0:55a05330f8cc	1413	u32_t value = 0;
darran	0:55a05330f8cc	1414	u16_t copy_len;
darran	0:55a05330f8cc	1415	decode_next:
darran	0:55a05330f8cc	1416	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
darran	0:55a05330f8cc	1417	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
darran	0:55a05330f8cc	1418	copy_len = LWIP_MIN(decode_len, 4);
darran	0:55a05330f8cc	1419	pbuf_copy_partial(q, &value, copy_len, val_offset);
darran	0:55a05330f8cc	1420	if (decode_len > 4) {
darran	0:55a05330f8cc	1421	/* decode more than one u32_t */
darran	0:55a05330f8cc	1422	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
darran	0:55a05330f8cc	1423	dhcp_got_option(dhcp, decode_idx);
darran	0:55a05330f8cc	1424	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
darran	0:55a05330f8cc	1425	decode_len -= 4;
darran	0:55a05330f8cc	1426	val_offset += 4;
darran	0:55a05330f8cc	1427	decode_idx++;
darran	0:55a05330f8cc	1428	goto decode_next;
darran	0:55a05330f8cc	1429	} else if (decode_len == 4) {
darran	0:55a05330f8cc	1430	value = ntohl(value);
darran	0:55a05330f8cc	1431	} else {
darran	0:55a05330f8cc	1432	LWIP_ASSERT("invalid decode_len", decode_len == 1);
darran	0:55a05330f8cc	1433	}
darran	0:55a05330f8cc	1434	dhcp_got_option(dhcp, decode_idx);
darran	0:55a05330f8cc	1435	dhcp_set_option_value(dhcp, decode_idx, value);
darran	0:55a05330f8cc	1436	}
darran	0:55a05330f8cc	1437	if (offset >= q->len) {
darran	0:55a05330f8cc	1438	offset -= q->len;
darran	0:55a05330f8cc	1439	offset_max -= q->len;
darran	0:55a05330f8cc	1440	q = q->next;
darran	0:55a05330f8cc	1441	options = (u8_t*)q->payload;
darran	0:55a05330f8cc	1442	}
darran	0:55a05330f8cc	1443	}
darran	0:55a05330f8cc	1444	/* is this an overloaded message? */
darran	0:55a05330f8cc	1445	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
darran	0:55a05330f8cc	1446	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
darran	0:55a05330f8cc	1447	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
darran	0:55a05330f8cc	1448	if (overload == DHCP_OVERLOAD_FILE) {
darran	0:55a05330f8cc	1449	parse_file_as_options = 1;
darran	0:55a05330f8cc	1450	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
darran	0:55a05330f8cc	1451	} else if (overload == DHCP_OVERLOAD_SNAME) {
darran	0:55a05330f8cc	1452	parse_sname_as_options = 1;
darran	0:55a05330f8cc	1453	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
darran	0:55a05330f8cc	1454	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
darran	0:55a05330f8cc	1455	parse_sname_as_options = 1;
darran	0:55a05330f8cc	1456	parse_file_as_options = 1;
darran	0:55a05330f8cc	1457	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
darran	0:55a05330f8cc	1458	} else {
darran	0:55a05330f8cc	1459	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
darran	0:55a05330f8cc	1460	}
darran	0:55a05330f8cc	1461	#if LWIP_DHCP_BOOTP_FILE
darran	0:55a05330f8cc	1462	if (!parse_file_as_options) {
darran	0:55a05330f8cc	1463	/* only do this for ACK messages */
darran	0:55a05330f8cc	1464	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
darran	0:55a05330f8cc	1465	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
darran	0:55a05330f8cc	1466	/* copy bootp file name, don't care for sname (server hostname) */
darran	0:55a05330f8cc	1467	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
darran	0:55a05330f8cc	1468	/* make sure the string is really NULL-terminated */
darran	0:55a05330f8cc	1469	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
darran	0:55a05330f8cc	1470	}
darran	0:55a05330f8cc	1471	#endif /* LWIP_DHCP_BOOTP_FILE */
darran	0:55a05330f8cc	1472	}
darran	0:55a05330f8cc	1473	if (parse_file_as_options) {
darran	0:55a05330f8cc	1474	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
darran	0:55a05330f8cc	1475	parse_file_as_options = 0;
darran	0:55a05330f8cc	1476	options_idx = DHCP_FILE_OFS;
darran	0:55a05330f8cc	1477	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
darran	0:55a05330f8cc	1478	goto again;
darran	0:55a05330f8cc	1479	} else if (parse_sname_as_options) {
darran	0:55a05330f8cc	1480	parse_sname_as_options = 0;
darran	0:55a05330f8cc	1481	options_idx = DHCP_SNAME_OFS;
darran	0:55a05330f8cc	1482	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
darran	0:55a05330f8cc	1483	goto again;
darran	0:55a05330f8cc	1484	}
darran	0:55a05330f8cc	1485	return ERR_OK;
darran	0:55a05330f8cc	1486	}
darran	0:55a05330f8cc	1487
darran	0:55a05330f8cc	1488	/**
darran	0:55a05330f8cc	1489	* If an incoming DHCP message is in response to us, then trigger the state machine
darran	0:55a05330f8cc	1490	*/
darran	0:55a05330f8cc	1491	static void
darran	0:55a05330f8cc	1492	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
darran	0:55a05330f8cc	1493	{
darran	0:55a05330f8cc	1494	struct netif netif = (struct netif )arg;
darran	0:55a05330f8cc	1495	struct dhcp *dhcp = netif->dhcp;
darran	0:55a05330f8cc	1496	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
darran	0:55a05330f8cc	1497	u8_t msg_type;
darran	0:55a05330f8cc	1498	u8_t i;
darran	0:55a05330f8cc	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	0:55a05330f8cc	1500	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
darran	0:55a05330f8cc	1501	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
darran	0:55a05330f8cc	1502	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
darran	0:55a05330f8cc	1503	/* prevent warnings about unused arguments */
darran	0:55a05330f8cc	1504	LWIP_UNUSED_ARG(pcb);
darran	0:55a05330f8cc	1505	LWIP_UNUSED_ARG(addr);
darran	0:55a05330f8cc	1506	LWIP_UNUSED_ARG(port);
darran	0:55a05330f8cc	1507
darran	0:55a05330f8cc	1508	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
darran	0:55a05330f8cc	1509
darran	0:55a05330f8cc	1510	if (p->len < DHCP_MIN_REPLY_LEN) {
darran	0:55a05330f8cc	1511	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
darran	0:55a05330f8cc	1512	goto free_pbuf_and_return;
darran	0:55a05330f8cc	1513	}
darran	0:55a05330f8cc	1514
darran	0:55a05330f8cc	1515	if (reply_msg->op != DHCP_BOOTREPLY) {
darran	0:55a05330f8cc	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	0:55a05330f8cc	1517	goto free_pbuf_and_return;
darran	0:55a05330f8cc	1518	}
darran	0:55a05330f8cc	1519	/* iterate through hardware address and match against DHCP message */
darran	0:55a05330f8cc	1520	for (i = 0; i < netif->hwaddr_len; i++) {
darran	0:55a05330f8cc	1521	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
darran	0:55a05330f8cc	1522	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
darran	0:55a05330f8cc	1523	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
darran	0:55a05330f8cc	1524	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
darran	0:55a05330f8cc	1525	goto free_pbuf_and_return;
darran	0:55a05330f8cc	1526	}
darran	0:55a05330f8cc	1527	}
darran	0:55a05330f8cc	1528	/* match transaction ID against what we expected */
darran	0:55a05330f8cc	1529	if (ntohl(reply_msg->xid) != dhcp->xid) {
darran	0:55a05330f8cc	1530	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
darran	0:55a05330f8cc	1531	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
darran	0:55a05330f8cc	1532	goto free_pbuf_and_return;
darran	0:55a05330f8cc	1533	}
darran	0:55a05330f8cc	1534	/* option fields could be unfold? */
darran	0:55a05330f8cc	1535	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
darran	0:55a05330f8cc	1536	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:55a05330f8cc	1537	("problem unfolding DHCP message - too short on memory?\n"));
darran	0:55a05330f8cc	1538	goto free_pbuf_and_return;
darran	0:55a05330f8cc	1539	}
darran	0:55a05330f8cc	1540
darran	0:55a05330f8cc	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
darran	0:55a05330f8cc	1542	/* obtain pointer to DHCP message type */
darran	0:55a05330f8cc	1543	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
darran	0:55a05330f8cc	1544	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
darran	0:55a05330f8cc	1545	goto free_pbuf_and_return;
darran	0:55a05330f8cc	1546	}
darran	0:55a05330f8cc	1547
darran	0:55a05330f8cc	1548	/* read DHCP message type */
darran	0:55a05330f8cc	1549	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
darran	0:55a05330f8cc	1550	/* message type is DHCP ACK? */
darran	0:55a05330f8cc	1551	if (msg_type == DHCP_ACK) {
darran	0:55a05330f8cc	1552	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
darran	0:55a05330f8cc	1553	/* in requesting state? */
darran	0:55a05330f8cc	1554	if (dhcp->state == DHCP_REQUESTING) {
darran	0:55a05330f8cc	1555	dhcp_handle_ack(netif);
darran	0:55a05330f8cc	1556	#if DHCP_DOES_ARP_CHECK
darran	0:55a05330f8cc	1557	/* check if the acknowledged lease address is already in use */
darran	0:55a05330f8cc	1558	dhcp_check(netif);
darran	0:55a05330f8cc	1559	#else
darran	0:55a05330f8cc	1560	/* bind interface to the acknowledged lease address */
darran	0:55a05330f8cc	1561	dhcp_bind(netif);
darran	0:55a05330f8cc	1562	#endif
darran	0:55a05330f8cc	1563	}
darran	0:55a05330f8cc	1564	/* already bound to the given lease address? */
darran	0:55a05330f8cc	1565	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
darran	0:55a05330f8cc	1566	dhcp_bind(netif);
darran	0:55a05330f8cc	1567	}
darran	0:55a05330f8cc	1568	}
darran	0:55a05330f8cc	1569	/* received a DHCP_NAK in appropriate state? */
darran	0:55a05330f8cc	1570	else if ((msg_type == DHCP_NAK) &&
darran	0:55a05330f8cc	1571	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
darran	0:55a05330f8cc	1572	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
darran	0:55a05330f8cc	1573	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
darran	0:55a05330f8cc	1574	dhcp_handle_nak(netif);
darran	0:55a05330f8cc	1575	}
darran	0:55a05330f8cc	1576	/* received a DHCP_OFFER in DHCP_SELECTING state? */
darran	0:55a05330f8cc	1577	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
darran	0:55a05330f8cc	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
darran	0:55a05330f8cc	1579	dhcp->request_timeout = 0;
darran	0:55a05330f8cc	1580	/* remember offered lease */
darran	0:55a05330f8cc	1581	dhcp_handle_offer(netif);
darran	0:55a05330f8cc	1582	}
darran	0:55a05330f8cc	1583	free_pbuf_and_return:
darran	0:55a05330f8cc	1584	dhcp->msg_in = NULL;
darran	0:55a05330f8cc	1585	pbuf_free(p);
darran	0:55a05330f8cc	1586	}
darran	0:55a05330f8cc	1587
darran	0:55a05330f8cc	1588	/**
darran	0:55a05330f8cc	1589	* Create a DHCP request, fill in common headers
darran	0:55a05330f8cc	1590	*
darran	0:55a05330f8cc	1591	* @param netif the netif under DHCP control
darran	0:55a05330f8cc	1592	* @param dhcp dhcp control struct
darran	0:55a05330f8cc	1593	* @param message_type message type of the request
darran	0:55a05330f8cc	1594	*/
darran	0:55a05330f8cc	1595	static err_t
darran	0:55a05330f8cc	1596	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
darran	0:55a05330f8cc	1597	{
darran	0:55a05330f8cc	1598	u16_t i;
darran	0:55a05330f8cc	1599	#ifndef DHCP_GLOBAL_XID
darran	0:55a05330f8cc	1600	/** default global transaction identifier starting value (easy to match
darran	0:55a05330f8cc	1601	* with a packet analyser). We simply increment for each new request.
darran	0:55a05330f8cc	1602	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
darran	0:55a05330f8cc	1603	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
darran	0:55a05330f8cc	1604	static u32_t xid = 0xABCD0000;
darran	0:55a05330f8cc	1605	#else
darran	0:55a05330f8cc	1606	static u32_t xid;
darran	0:55a05330f8cc	1607	static u8_t xid_initialised = 0;
darran	0:55a05330f8cc	1608	if (!xid_initialised) {
darran	0:55a05330f8cc	1609	xid = DHCP_GLOBAL_XID;
darran	0:55a05330f8cc	1610	xid_initialised = !xid_initialised;
darran	0:55a05330f8cc	1611	}
darran	0:55a05330f8cc	1612	#endif
darran	0:55a05330f8cc	1613	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
darran	0:55a05330f8cc	1614	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
darran	0:55a05330f8cc	1615	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
darran	0:55a05330f8cc	1616	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
darran	0:55a05330f8cc	1617	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
darran	0:55a05330f8cc	1618	if (dhcp->p_out == NULL) {
darran	0:55a05330f8cc	1619	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:55a05330f8cc	1620	("dhcp_create_msg(): could not allocate pbuf\n"));
darran	0:55a05330f8cc	1621	return ERR_MEM;
darran	0:55a05330f8cc	1622	}
darran	0:55a05330f8cc	1623	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
darran	0:55a05330f8cc	1624	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
darran	0:55a05330f8cc	1625
darran	0:55a05330f8cc	1626	/* reuse transaction identifier in retransmissions */
darran	0:55a05330f8cc	1627	if (dhcp->tries == 0) {
darran	0:55a05330f8cc	1628	xid++;
darran	0:55a05330f8cc	1629	}
darran	0:55a05330f8cc	1630	dhcp->xid = xid;
darran	0:55a05330f8cc	1631	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
darran	0:55a05330f8cc	1632	("transaction id xid(%"X32_F")\n", xid));
darran	0:55a05330f8cc	1633
darran	0:55a05330f8cc	1634	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
darran	0:55a05330f8cc	1635
darran	0:55a05330f8cc	1636	dhcp->msg_out->op = DHCP_BOOTREQUEST;
darran	0:55a05330f8cc	1637	/* TODO: make link layer independent */
darran	0:55a05330f8cc	1638	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
darran	0:55a05330f8cc	1639	dhcp->msg_out->hlen = netif->hwaddr_len;
darran	0:55a05330f8cc	1640	dhcp->msg_out->hops = 0;
darran	0:55a05330f8cc	1641	dhcp->msg_out->xid = htonl(dhcp->xid);
darran	0:55a05330f8cc	1642	dhcp->msg_out->secs = 0;
darran	0:55a05330f8cc	1643	/* we don't need the broadcast flag since we can receive unicast traffic
darran	0:55a05330f8cc	1644	before being fully configured! */
darran	0:55a05330f8cc	1645	dhcp->msg_out->flags = 0;
darran	0:55a05330f8cc	1646	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
darran	0:55a05330f8cc	1647	/* set ciaddr to netif->ip_addr based on message_type and state */
darran	0:55a05330f8cc	1648	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
darran	0:55a05330f8cc	1649	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
darran	0:55a05330f8cc	1650	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
darran	0:55a05330f8cc	1651	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
darran	0:55a05330f8cc	1652	}
darran	0:55a05330f8cc	1653	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
darran	0:55a05330f8cc	1654	ip_addr_set_zero(&dhcp->msg_out->siaddr);
darran	0:55a05330f8cc	1655	ip_addr_set_zero(&dhcp->msg_out->giaddr);
darran	0:55a05330f8cc	1656	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
darran	0:55a05330f8cc	1657	/* copy netif hardware address, pad with zeroes */
darran	0:55a05330f8cc	1658	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
darran	0:55a05330f8cc	1659	}
darran	0:55a05330f8cc	1660	for (i = 0; i < DHCP_SNAME_LEN; i++) {
darran	0:55a05330f8cc	1661	dhcp->msg_out->sname[i] = 0;
darran	0:55a05330f8cc	1662	}
darran	0:55a05330f8cc	1663	for (i = 0; i < DHCP_FILE_LEN; i++) {
darran	0:55a05330f8cc	1664	dhcp->msg_out->file[i] = 0;
darran	0:55a05330f8cc	1665	}
darran	0:55a05330f8cc	1666	dhcp->msg_out->cookie = htonl(DHCP_MAGIC_COOKIE);
darran	0:55a05330f8cc	1667	dhcp->options_out_len = 0;
darran	0:55a05330f8cc	1668	/* fill options field with an incrementing array (for debugging purposes) */
darran	0:55a05330f8cc	1669	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
darran	0:55a05330f8cc	1670	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
darran	0:55a05330f8cc	1671	}
darran	0:55a05330f8cc	1672	/* Add option MESSAGE_TYPE */
darran	0:55a05330f8cc	1673	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
darran	0:55a05330f8cc	1674	dhcp_option_byte(dhcp, message_type);
darran	0:55a05330f8cc	1675	return ERR_OK;
darran	0:55a05330f8cc	1676	}
darran	0:55a05330f8cc	1677
darran	0:55a05330f8cc	1678	/**
darran	0:55a05330f8cc	1679	* Free previously allocated memory used to send a DHCP request.
darran	0:55a05330f8cc	1680	*
darran	0:55a05330f8cc	1681	* @param dhcp the dhcp struct to free the request from
darran	0:55a05330f8cc	1682	*/
darran	0:55a05330f8cc	1683	static void
darran	0:55a05330f8cc	1684	dhcp_delete_msg(struct dhcp *dhcp)
darran	0:55a05330f8cc	1685	{
darran	0:55a05330f8cc	1686	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
darran	0:55a05330f8cc	1687	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
darran	0:55a05330f8cc	1688	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
darran	0:55a05330f8cc	1689	if (dhcp->p_out != NULL) {
darran	0:55a05330f8cc	1690	pbuf_free(dhcp->p_out);
darran	0:55a05330f8cc	1691	}
darran	0:55a05330f8cc	1692	dhcp->p_out = NULL;
darran	0:55a05330f8cc	1693	dhcp->msg_out = NULL;
darran	0:55a05330f8cc	1694	}
darran	0:55a05330f8cc	1695
darran	0:55a05330f8cc	1696	/**
darran	0:55a05330f8cc	1697	* Add a DHCP message trailer
darran	0:55a05330f8cc	1698	*
darran	0:55a05330f8cc	1699	* Adds the END option to the DHCP message, and if
darran	0:55a05330f8cc	1700	* necessary, up to three padding bytes.
darran	0:55a05330f8cc	1701	*
darran	0:55a05330f8cc	1702	* @param dhcp DHCP state structure
darran	0:55a05330f8cc	1703	*/
darran	0:55a05330f8cc	1704	static void
darran	0:55a05330f8cc	1705	dhcp_option_trailer(struct dhcp *dhcp)
darran	0:55a05330f8cc	1706	{
darran	0:55a05330f8cc	1707	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
darran	0:55a05330f8cc	1708	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
darran	0:55a05330f8cc	1709	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
darran	0:55a05330f8cc	1710	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
darran	0:55a05330f8cc	1711	/* packet is too small, or not 4 byte aligned? */
darran	0:55a05330f8cc	1712	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
darran	0:55a05330f8cc	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	0:55a05330f8cc	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
darran	0:55a05330f8cc	1715	/* add a fill/padding byte */
darran	0:55a05330f8cc	1716	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
darran	0:55a05330f8cc	1717	}
darran	0:55a05330f8cc	1718	}
darran	0:55a05330f8cc	1719
darran	0:55a05330f8cc	1720	#endif /* LWIP_DHCP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	18 Jun 2010
Imports:	7
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

lwip/core/dhcp.c@1:4218cacaf696, 2010-06-18 (annotated)

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