StrippedDownNetServices - This library is stripped down version of NetServi…

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This library is stripped down version of NetServices library. HTTP server and client function is NOT supported.

lwip/core/dhcp.c@0:dcf3c92487ca, 2011-07-20 (annotated)

Committer:: idinor
Date:: Wed Jul 20 11:45:39 2011 +0000
Revision:: 0:dcf3c92487ca

Who changed what in which revision?

User	Revision	Line number	New contents of line
idinor	0:dcf3c92487ca	1	/**
idinor	0:dcf3c92487ca	2	* @file
idinor	0:dcf3c92487ca	3	* Dynamic Host Configuration Protocol client
idinor	0:dcf3c92487ca	4	*
idinor	0:dcf3c92487ca	5	*/
idinor	0:dcf3c92487ca	6
idinor	0:dcf3c92487ca	7	/*
idinor	0:dcf3c92487ca	8	*
idinor	0:dcf3c92487ca	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
idinor	0:dcf3c92487ca	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
idinor	0:dcf3c92487ca	11	* All rights reserved.
idinor	0:dcf3c92487ca	12	*
idinor	0:dcf3c92487ca	13	* Redistribution and use in source and binary forms, with or without modification,
idinor	0:dcf3c92487ca	14	* are permitted provided that the following conditions are met:
idinor	0:dcf3c92487ca	15	*
idinor	0:dcf3c92487ca	16	* 1. Redistributions of source code must retain the above copyright notice,
idinor	0:dcf3c92487ca	17	* this list of conditions and the following disclaimer.
idinor	0:dcf3c92487ca	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
idinor	0:dcf3c92487ca	19	* this list of conditions and the following disclaimer in the documentation
idinor	0:dcf3c92487ca	20	* and/or other materials provided with the distribution.
idinor	0:dcf3c92487ca	21	* 3. The name of the author may not be used to endorse or promote products
idinor	0:dcf3c92487ca	22	* derived from this software without specific prior written permission.
idinor	0:dcf3c92487ca	23	*
idinor	0:dcf3c92487ca	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
idinor	0:dcf3c92487ca	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
idinor	0:dcf3c92487ca	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
idinor	0:dcf3c92487ca	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
idinor	0:dcf3c92487ca	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
idinor	0:dcf3c92487ca	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
idinor	0:dcf3c92487ca	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
idinor	0:dcf3c92487ca	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
idinor	0:dcf3c92487ca	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
idinor	0:dcf3c92487ca	33	* OF SUCH DAMAGE.
idinor	0:dcf3c92487ca	34	*
idinor	0:dcf3c92487ca	35	* This file is a contribution to the lwIP TCP/IP stack.
idinor	0:dcf3c92487ca	36	* The Swedish Institute of Computer Science and Adam Dunkels
idinor	0:dcf3c92487ca	37	* are specifically granted permission to redistribute this
idinor	0:dcf3c92487ca	38	* source code.
idinor	0:dcf3c92487ca	39	*
idinor	0:dcf3c92487ca	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
idinor	0:dcf3c92487ca	41	*
idinor	0:dcf3c92487ca	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
idinor	0:dcf3c92487ca	43	* with RFC 2131 and RFC 2132.
idinor	0:dcf3c92487ca	44	*
idinor	0:dcf3c92487ca	45	* TODO:
idinor	0:dcf3c92487ca	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
idinor	0:dcf3c92487ca	47	*
idinor	0:dcf3c92487ca	48	* Please coordinate changes and requests with Leon Woestenberg
idinor	0:dcf3c92487ca	49	* <leon.woestenberg@gmx.net>
idinor	0:dcf3c92487ca	50	*
idinor	0:dcf3c92487ca	51	* Integration with your code:
idinor	0:dcf3c92487ca	52	*
idinor	0:dcf3c92487ca	53	* In lwip/dhcp.h
idinor	0:dcf3c92487ca	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
idinor	0:dcf3c92487ca	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
idinor	0:dcf3c92487ca	56	*
idinor	0:dcf3c92487ca	57	* Then have your application call dhcp_coarse_tmr() and
idinor	0:dcf3c92487ca	58	* dhcp_fine_tmr() on the defined intervals.
idinor	0:dcf3c92487ca	59	*
idinor	0:dcf3c92487ca	60	* dhcp_start(struct netif *netif);
idinor	0:dcf3c92487ca	61	* starts a DHCP client instance which configures the interface by
idinor	0:dcf3c92487ca	62	* obtaining an IP address lease and maintaining it.
idinor	0:dcf3c92487ca	63	*
idinor	0:dcf3c92487ca	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
idinor	0:dcf3c92487ca	65	* to remove the DHCP client.
idinor	0:dcf3c92487ca	66	*
idinor	0:dcf3c92487ca	67	*/
idinor	0:dcf3c92487ca	68
idinor	0:dcf3c92487ca	69	#include "lwip/opt.h"
idinor	0:dcf3c92487ca	70
idinor	0:dcf3c92487ca	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
idinor	0:dcf3c92487ca	72
idinor	0:dcf3c92487ca	73	#include "lwip/stats.h"
idinor	0:dcf3c92487ca	74	#include "lwip/mem.h"
idinor	0:dcf3c92487ca	75	#include "lwip/udp.h"
idinor	0:dcf3c92487ca	76	#include "lwip/ip_addr.h"
idinor	0:dcf3c92487ca	77	#include "lwip/netif.h"
idinor	0:dcf3c92487ca	78	#include "lwip/def.h"
idinor	0:dcf3c92487ca	79	#include "lwip/sys.h"
idinor	0:dcf3c92487ca	80	#include "lwip/dhcp.h"
idinor	0:dcf3c92487ca	81	#include "lwip/autoip.h"
idinor	0:dcf3c92487ca	82	#include "lwip/dns.h"
idinor	0:dcf3c92487ca	83	#include "netif/etharp.h"
idinor	0:dcf3c92487ca	84
idinor	0:dcf3c92487ca	85	#include <string.h>
idinor	0:dcf3c92487ca	86
idinor	0:dcf3c92487ca	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
idinor	0:dcf3c92487ca	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
idinor	0:dcf3c92487ca	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
idinor	0:dcf3c92487ca	90	* #define DHCP_GLOBAL_XID rand()
idinor	0:dcf3c92487ca	91	*/
idinor	0:dcf3c92487ca	92	#ifdef DHCP_GLOBAL_XID_HEADER
idinor	0:dcf3c92487ca	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
idinor	0:dcf3c92487ca	94	#endif
idinor	0:dcf3c92487ca	95
idinor	0:dcf3c92487ca	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
idinor	0:dcf3c92487ca	97	* MTU is checked to be big enough in dhcp_start */
idinor	0:dcf3c92487ca	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
idinor	0:dcf3c92487ca	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
idinor	0:dcf3c92487ca	100	/** Minimum length for reply before packet is parsed */
idinor	0:dcf3c92487ca	101	#define DHCP_MIN_REPLY_LEN 44
idinor	0:dcf3c92487ca	102
idinor	0:dcf3c92487ca	103	#define REBOOT_TRIES 2
idinor	0:dcf3c92487ca	104
idinor	0:dcf3c92487ca	105	/** Option handling: options are parsed in dhcp_parse_reply
idinor	0:dcf3c92487ca	106	* and saved in an array where other functions can load them from.
idinor	0:dcf3c92487ca	107	* This might be moved into the struct dhcp (not necessarily since
idinor	0:dcf3c92487ca	108	* lwIP is single-threaded and the array is only used while in recv
idinor	0:dcf3c92487ca	109	* callback). */
idinor	0:dcf3c92487ca	110	#define DHCP_OPTION_IDX_OVERLOAD 0
idinor	0:dcf3c92487ca	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
idinor	0:dcf3c92487ca	112	#define DHCP_OPTION_IDX_SERVER_ID 2
idinor	0:dcf3c92487ca	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
idinor	0:dcf3c92487ca	114	#define DHCP_OPTION_IDX_T1 4
idinor	0:dcf3c92487ca	115	#define DHCP_OPTION_IDX_T2 5
idinor	0:dcf3c92487ca	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
idinor	0:dcf3c92487ca	117	#define DHCP_OPTION_IDX_ROUTER 7
idinor	0:dcf3c92487ca	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
idinor	0:dcf3c92487ca	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
idinor	0:dcf3c92487ca	120
idinor	0:dcf3c92487ca	121	/** Holds the decoded option values, only valid while in dhcp_recv.
idinor	0:dcf3c92487ca	122	@todo: move this into struct dhcp? */
idinor	0:dcf3c92487ca	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
idinor	0:dcf3c92487ca	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
idinor	0:dcf3c92487ca	125	only valid while in dhcp_recv.
idinor	0:dcf3c92487ca	126	@todo: move this into struct dhcp? */
idinor	0:dcf3c92487ca	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
idinor	0:dcf3c92487ca	128
idinor	0:dcf3c92487ca	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
idinor	0:dcf3c92487ca	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
idinor	0:dcf3c92487ca	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
idinor	0:dcf3c92487ca	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
idinor	0:dcf3c92487ca	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
idinor	0:dcf3c92487ca	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
idinor	0:dcf3c92487ca	135
idinor	0:dcf3c92487ca	136
idinor	0:dcf3c92487ca	137	/* DHCP client state machine functions */
idinor	0:dcf3c92487ca	138	static err_t dhcp_discover(struct netif *netif);
idinor	0:dcf3c92487ca	139	static err_t dhcp_select(struct netif *netif);
idinor	0:dcf3c92487ca	140	static void dhcp_bind(struct netif *netif);
idinor	0:dcf3c92487ca	141	#if DHCP_DOES_ARP_CHECK
idinor	0:dcf3c92487ca	142	static err_t dhcp_decline(struct netif *netif);
idinor	0:dcf3c92487ca	143	#endif /* DHCP_DOES_ARP_CHECK */
idinor	0:dcf3c92487ca	144	static err_t dhcp_rebind(struct netif *netif);
idinor	0:dcf3c92487ca	145	static err_t dhcp_reboot(struct netif *netif);
idinor	0:dcf3c92487ca	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
idinor	0:dcf3c92487ca	147
idinor	0:dcf3c92487ca	148	/* receive, unfold, parse and free incoming messages */
idinor	0:dcf3c92487ca	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
idinor	0:dcf3c92487ca	150
idinor	0:dcf3c92487ca	151	/* set the DHCP timers */
idinor	0:dcf3c92487ca	152	static void dhcp_timeout(struct netif *netif);
idinor	0:dcf3c92487ca	153	static void dhcp_t1_timeout(struct netif *netif);
idinor	0:dcf3c92487ca	154	static void dhcp_t2_timeout(struct netif *netif);
idinor	0:dcf3c92487ca	155
idinor	0:dcf3c92487ca	156	/* build outgoing messages */
idinor	0:dcf3c92487ca	157	/* create a DHCP message, fill in common headers */
idinor	0:dcf3c92487ca	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
idinor	0:dcf3c92487ca	159	/* free a DHCP request */
idinor	0:dcf3c92487ca	160	static void dhcp_delete_msg(struct dhcp *dhcp);
idinor	0:dcf3c92487ca	161	/* add a DHCP option (type, then length in bytes) */
idinor	0:dcf3c92487ca	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
idinor	0:dcf3c92487ca	163	/* add option values */
idinor	0:dcf3c92487ca	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
idinor	0:dcf3c92487ca	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
idinor	0:dcf3c92487ca	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
idinor	0:dcf3c92487ca	167	/* always add the DHCP options trailer to end and pad */
idinor	0:dcf3c92487ca	168	static void dhcp_option_trailer(struct dhcp *dhcp);
idinor	0:dcf3c92487ca	169
idinor	0:dcf3c92487ca	170	/**
idinor	0:dcf3c92487ca	171	* Back-off the DHCP client (because of a received NAK response).
idinor	0:dcf3c92487ca	172	*
idinor	0:dcf3c92487ca	173	* Back-off the DHCP client because of a received NAK. Receiving a
idinor	0:dcf3c92487ca	174	* NAK means the client asked for something non-sensible, for
idinor	0:dcf3c92487ca	175	* example when it tries to renew a lease obtained on another network.
idinor	0:dcf3c92487ca	176	*
idinor	0:dcf3c92487ca	177	* We clear any existing set IP address and restart DHCP negotiation
idinor	0:dcf3c92487ca	178	* afresh (as per RFC2131 3.2.3).
idinor	0:dcf3c92487ca	179	*
idinor	0:dcf3c92487ca	180	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	181	*/
idinor	0:dcf3c92487ca	182	static void
idinor	0:dcf3c92487ca	183	dhcp_handle_nak(struct netif *netif)
idinor	0:dcf3c92487ca	184	{
idinor	0:dcf3c92487ca	185	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
idinor	0:dcf3c92487ca	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
idinor	0:dcf3c92487ca	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
idinor	0:dcf3c92487ca	189	netif_set_down(netif);
idinor	0:dcf3c92487ca	190	/* remove IP address from interface */
idinor	0:dcf3c92487ca	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
idinor	0:dcf3c92487ca	192	netif_set_gw(netif, IP_ADDR_ANY);
idinor	0:dcf3c92487ca	193	netif_set_netmask(netif, IP_ADDR_ANY);
idinor	0:dcf3c92487ca	194	/* Change to a defined state */
idinor	0:dcf3c92487ca	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
idinor	0:dcf3c92487ca	196	/* We can immediately restart discovery */
idinor	0:dcf3c92487ca	197	dhcp_discover(netif);
idinor	0:dcf3c92487ca	198	}
idinor	0:dcf3c92487ca	199
idinor	0:dcf3c92487ca	200	#if DHCP_DOES_ARP_CHECK
idinor	0:dcf3c92487ca	201	/**
idinor	0:dcf3c92487ca	202	* Checks if the offered IP address is already in use.
idinor	0:dcf3c92487ca	203	*
idinor	0:dcf3c92487ca	204	* It does so by sending an ARP request for the offered address and
idinor	0:dcf3c92487ca	205	* entering CHECKING state. If no ARP reply is received within a small
idinor	0:dcf3c92487ca	206	* interval, the address is assumed to be free for use by us.
idinor	0:dcf3c92487ca	207	*
idinor	0:dcf3c92487ca	208	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	209	*/
idinor	0:dcf3c92487ca	210	static void
idinor	0:dcf3c92487ca	211	dhcp_check(struct netif *netif)
idinor	0:dcf3c92487ca	212	{
idinor	0:dcf3c92487ca	213	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	214	err_t result;
idinor	0:dcf3c92487ca	215	u16_t msecs;
idinor	0:dcf3c92487ca	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
idinor	0:dcf3c92487ca	217	(s16_t)netif->name[1]));
idinor	0:dcf3c92487ca	218	dhcp_set_state(dhcp, DHCP_CHECKING);
idinor	0:dcf3c92487ca	219	/* create an ARP query for the offered IP address, expecting that no host
idinor	0:dcf3c92487ca	220	responds, as the IP address should not be in use. */
idinor	0:dcf3c92487ca	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
idinor	0:dcf3c92487ca	222	if (result != ERR_OK) {
idinor	0:dcf3c92487ca	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
idinor	0:dcf3c92487ca	224	}
idinor	0:dcf3c92487ca	225	dhcp->tries++;
idinor	0:dcf3c92487ca	226	msecs = 500;
idinor	0:dcf3c92487ca	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	229	}
idinor	0:dcf3c92487ca	230	#endif /* DHCP_DOES_ARP_CHECK */
idinor	0:dcf3c92487ca	231
idinor	0:dcf3c92487ca	232	/**
idinor	0:dcf3c92487ca	233	* Remember the configuration offered by a DHCP server.
idinor	0:dcf3c92487ca	234	*
idinor	0:dcf3c92487ca	235	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	236	*/
idinor	0:dcf3c92487ca	237	static void
idinor	0:dcf3c92487ca	238	dhcp_handle_offer(struct netif *netif)
idinor	0:dcf3c92487ca	239	{
idinor	0:dcf3c92487ca	240	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
idinor	0:dcf3c92487ca	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
idinor	0:dcf3c92487ca	243	/* obtain the server address */
idinor	0:dcf3c92487ca	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
idinor	0:dcf3c92487ca	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
idinor	0:dcf3c92487ca	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
idinor	0:dcf3c92487ca	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
idinor	0:dcf3c92487ca	248	/* remember offered address */
idinor	0:dcf3c92487ca	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
idinor	0:dcf3c92487ca	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
idinor	0:dcf3c92487ca	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
idinor	0:dcf3c92487ca	252
idinor	0:dcf3c92487ca	253	dhcp_select(netif);
idinor	0:dcf3c92487ca	254	} else {
idinor	0:dcf3c92487ca	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
idinor	0:dcf3c92487ca	257	}
idinor	0:dcf3c92487ca	258	}
idinor	0:dcf3c92487ca	259
idinor	0:dcf3c92487ca	260	/**
idinor	0:dcf3c92487ca	261	* Select a DHCP server offer out of all offers.
idinor	0:dcf3c92487ca	262	*
idinor	0:dcf3c92487ca	263	* Simply select the first offer received.
idinor	0:dcf3c92487ca	264	*
idinor	0:dcf3c92487ca	265	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	266	* @return lwIP specific error (see error.h)
idinor	0:dcf3c92487ca	267	*/
idinor	0:dcf3c92487ca	268	static err_t
idinor	0:dcf3c92487ca	269	dhcp_select(struct netif *netif)
idinor	0:dcf3c92487ca	270	{
idinor	0:dcf3c92487ca	271	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	272	err_t result;
idinor	0:dcf3c92487ca	273	u16_t msecs;
idinor	0:dcf3c92487ca	274
idinor	0:dcf3c92487ca	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));
idinor	0:dcf3c92487ca	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
idinor	0:dcf3c92487ca	277
idinor	0:dcf3c92487ca	278	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
idinor	0:dcf3c92487ca	280	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
idinor	0:dcf3c92487ca	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
idinor	0:dcf3c92487ca	283
idinor	0:dcf3c92487ca	284	/* MUST request the offered IP address */
idinor	0:dcf3c92487ca	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
idinor	0:dcf3c92487ca	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
idinor	0:dcf3c92487ca	287
idinor	0:dcf3c92487ca	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
idinor	0:dcf3c92487ca	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
idinor	0:dcf3c92487ca	290
idinor	0:dcf3c92487ca	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
idinor	0:dcf3c92487ca	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
idinor	0:dcf3c92487ca	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
idinor	0:dcf3c92487ca	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
idinor	0:dcf3c92487ca	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
idinor	0:dcf3c92487ca	296
idinor	0:dcf3c92487ca	297	#if LWIP_NETIF_HOSTNAME
idinor	0:dcf3c92487ca	298	if (netif->hostname != NULL) {
idinor	0:dcf3c92487ca	299	const char p = (const char)netif->hostname;
idinor	0:dcf3c92487ca	300	u8_t namelen = (u8_t)strlen(p);
idinor	0:dcf3c92487ca	301	if (namelen > 0) {
idinor	0:dcf3c92487ca	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
idinor	0:dcf3c92487ca	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
idinor	0:dcf3c92487ca	304	while (*p) {
idinor	0:dcf3c92487ca	305	dhcp_option_byte(dhcp, *p++);
idinor	0:dcf3c92487ca	306	}
idinor	0:dcf3c92487ca	307	}
idinor	0:dcf3c92487ca	308	}
idinor	0:dcf3c92487ca	309	#endif /* LWIP_NETIF_HOSTNAME */
idinor	0:dcf3c92487ca	310
idinor	0:dcf3c92487ca	311	dhcp_option_trailer(dhcp);
idinor	0:dcf3c92487ca	312	/* shrink the pbuf to the actual content length */
idinor	0:dcf3c92487ca	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
idinor	0:dcf3c92487ca	314
idinor	0:dcf3c92487ca	315	/* send broadcast to any DHCP server */
idinor	0:dcf3c92487ca	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	317	dhcp_delete_msg(dhcp);
idinor	0:dcf3c92487ca	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
idinor	0:dcf3c92487ca	319	} else {
idinor	0:dcf3c92487ca	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	321	}
idinor	0:dcf3c92487ca	322	dhcp->tries++;
idinor	0:dcf3c92487ca	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
idinor	0:dcf3c92487ca	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	326	return result;
idinor	0:dcf3c92487ca	327	}
idinor	0:dcf3c92487ca	328
idinor	0:dcf3c92487ca	329	/**
idinor	0:dcf3c92487ca	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
idinor	0:dcf3c92487ca	331	*/
idinor	0:dcf3c92487ca	332	void
idinor	0:dcf3c92487ca	333	dhcp_coarse_tmr()
idinor	0:dcf3c92487ca	334	{
idinor	0:dcf3c92487ca	335	struct netif *netif = netif_list;
idinor	0:dcf3c92487ca	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
idinor	0:dcf3c92487ca	337	/* iterate through all network interfaces */
idinor	0:dcf3c92487ca	338	while (netif != NULL) {
idinor	0:dcf3c92487ca	339	/* only act on DHCP configured interfaces */
idinor	0:dcf3c92487ca	340	if (netif->dhcp != NULL) {
idinor	0:dcf3c92487ca	341	/* timer is active (non zero), and triggers (zeroes) now? */
idinor	0:dcf3c92487ca	342	if (netif->dhcp->t2_timeout-- == 1) {
idinor	0:dcf3c92487ca	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
idinor	0:dcf3c92487ca	344	/* this clients' rebind timeout triggered */
idinor	0:dcf3c92487ca	345	dhcp_t2_timeout(netif);
idinor	0:dcf3c92487ca	346	/* timer is active (non zero), and triggers (zeroes) now */
idinor	0:dcf3c92487ca	347	} else if (netif->dhcp->t1_timeout-- == 1) {
idinor	0:dcf3c92487ca	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
idinor	0:dcf3c92487ca	349	/* this clients' renewal timeout triggered */
idinor	0:dcf3c92487ca	350	dhcp_t1_timeout(netif);
idinor	0:dcf3c92487ca	351	}
idinor	0:dcf3c92487ca	352	}
idinor	0:dcf3c92487ca	353	/* proceed to next netif */
idinor	0:dcf3c92487ca	354	netif = netif->next;
idinor	0:dcf3c92487ca	355	}
idinor	0:dcf3c92487ca	356	}
idinor	0:dcf3c92487ca	357
idinor	0:dcf3c92487ca	358	/**
idinor	0:dcf3c92487ca	359	* DHCP transaction timeout handling
idinor	0:dcf3c92487ca	360	*
idinor	0:dcf3c92487ca	361	* A DHCP server is expected to respond within a short period of time.
idinor	0:dcf3c92487ca	362	* This timer checks whether an outstanding DHCP request is timed out.
idinor	0:dcf3c92487ca	363	*/
idinor	0:dcf3c92487ca	364	void
idinor	0:dcf3c92487ca	365	dhcp_fine_tmr()
idinor	0:dcf3c92487ca	366	{
idinor	0:dcf3c92487ca	367	struct netif *netif = netif_list;
idinor	0:dcf3c92487ca	368	/* loop through netif's */
idinor	0:dcf3c92487ca	369	while (netif != NULL) {
idinor	0:dcf3c92487ca	370	/* only act on DHCP configured interfaces */
idinor	0:dcf3c92487ca	371	if (netif->dhcp != NULL) {
idinor	0:dcf3c92487ca	372	/* timer is active (non zero), and is about to trigger now */
idinor	0:dcf3c92487ca	373	if (netif->dhcp->request_timeout > 1) {
idinor	0:dcf3c92487ca	374	netif->dhcp->request_timeout--;
idinor	0:dcf3c92487ca	375	}
idinor	0:dcf3c92487ca	376	else if (netif->dhcp->request_timeout == 1) {
idinor	0:dcf3c92487ca	377	netif->dhcp->request_timeout--;
idinor	0:dcf3c92487ca	378	/* { netif->dhcp->request_timeout == 0 } */
idinor	0:dcf3c92487ca	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
idinor	0:dcf3c92487ca	380	/* this client's request timeout triggered */
idinor	0:dcf3c92487ca	381	dhcp_timeout(netif);
idinor	0:dcf3c92487ca	382	}
idinor	0:dcf3c92487ca	383	}
idinor	0:dcf3c92487ca	384	/* proceed to next network interface */
idinor	0:dcf3c92487ca	385	netif = netif->next;
idinor	0:dcf3c92487ca	386	}
idinor	0:dcf3c92487ca	387	}
idinor	0:dcf3c92487ca	388
idinor	0:dcf3c92487ca	389	/**
idinor	0:dcf3c92487ca	390	* A DHCP negotiation transaction, or ARP request, has timed out.
idinor	0:dcf3c92487ca	391	*
idinor	0:dcf3c92487ca	392	* The timer that was started with the DHCP or ARP request has
idinor	0:dcf3c92487ca	393	* timed out, indicating no response was received in time.
idinor	0:dcf3c92487ca	394	*
idinor	0:dcf3c92487ca	395	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	396	*/
idinor	0:dcf3c92487ca	397	static void
idinor	0:dcf3c92487ca	398	dhcp_timeout(struct netif *netif)
idinor	0:dcf3c92487ca	399	{
idinor	0:dcf3c92487ca	400	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
idinor	0:dcf3c92487ca	402	/* back-off period has passed, or server selection timed out */
idinor	0:dcf3c92487ca	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
idinor	0:dcf3c92487ca	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
idinor	0:dcf3c92487ca	405	dhcp_discover(netif);
idinor	0:dcf3c92487ca	406	/* receiving the requested lease timed out */
idinor	0:dcf3c92487ca	407	} else if (dhcp->state == DHCP_REQUESTING) {
idinor	0:dcf3c92487ca	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
idinor	0:dcf3c92487ca	409	if (dhcp->tries <= 5) {
idinor	0:dcf3c92487ca	410	dhcp_select(netif);
idinor	0:dcf3c92487ca	411	} else {
idinor	0:dcf3c92487ca	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
idinor	0:dcf3c92487ca	413	dhcp_release(netif);
idinor	0:dcf3c92487ca	414	dhcp_discover(netif);
idinor	0:dcf3c92487ca	415	}
idinor	0:dcf3c92487ca	416	#if DHCP_DOES_ARP_CHECK
idinor	0:dcf3c92487ca	417	/* received no ARP reply for the offered address (which is good) */
idinor	0:dcf3c92487ca	418	} else if (dhcp->state == DHCP_CHECKING) {
idinor	0:dcf3c92487ca	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
idinor	0:dcf3c92487ca	420	if (dhcp->tries <= 1) {
idinor	0:dcf3c92487ca	421	dhcp_check(netif);
idinor	0:dcf3c92487ca	422	/* no ARP replies on the offered address,
idinor	0:dcf3c92487ca	423	looks like the IP address is indeed free */
idinor	0:dcf3c92487ca	424	} else {
idinor	0:dcf3c92487ca	425	/* bind the interface to the offered address */
idinor	0:dcf3c92487ca	426	dhcp_bind(netif);
idinor	0:dcf3c92487ca	427	}
idinor	0:dcf3c92487ca	428	#endif /* DHCP_DOES_ARP_CHECK */
idinor	0:dcf3c92487ca	429	}
idinor	0:dcf3c92487ca	430	/* did not get response to renew request? */
idinor	0:dcf3c92487ca	431	else if (dhcp->state == DHCP_RENEWING) {
idinor	0:dcf3c92487ca	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
idinor	0:dcf3c92487ca	433	/* just retry renewal */
idinor	0:dcf3c92487ca	434	/* note that the rebind timer will eventually time-out if renew does not work */
idinor	0:dcf3c92487ca	435	dhcp_renew(netif);
idinor	0:dcf3c92487ca	436	/* did not get response to rebind request? */
idinor	0:dcf3c92487ca	437	} else if (dhcp->state == DHCP_REBINDING) {
idinor	0:dcf3c92487ca	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
idinor	0:dcf3c92487ca	439	if (dhcp->tries <= 8) {
idinor	0:dcf3c92487ca	440	dhcp_rebind(netif);
idinor	0:dcf3c92487ca	441	} else {
idinor	0:dcf3c92487ca	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
idinor	0:dcf3c92487ca	443	dhcp_release(netif);
idinor	0:dcf3c92487ca	444	dhcp_discover(netif);
idinor	0:dcf3c92487ca	445	}
idinor	0:dcf3c92487ca	446	} else if (dhcp->state == DHCP_REBOOTING) {
idinor	0:dcf3c92487ca	447	if (dhcp->tries < REBOOT_TRIES) {
idinor	0:dcf3c92487ca	448	dhcp_reboot(netif);
idinor	0:dcf3c92487ca	449	} else {
idinor	0:dcf3c92487ca	450	dhcp_discover(netif);
idinor	0:dcf3c92487ca	451	}
idinor	0:dcf3c92487ca	452	}
idinor	0:dcf3c92487ca	453	}
idinor	0:dcf3c92487ca	454
idinor	0:dcf3c92487ca	455	/**
idinor	0:dcf3c92487ca	456	* The renewal period has timed out.
idinor	0:dcf3c92487ca	457	*
idinor	0:dcf3c92487ca	458	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	459	*/
idinor	0:dcf3c92487ca	460	static void
idinor	0:dcf3c92487ca	461	dhcp_t1_timeout(struct netif *netif)
idinor	0:dcf3c92487ca	462	{
idinor	0:dcf3c92487ca	463	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
idinor	0:dcf3c92487ca	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
idinor	0:dcf3c92487ca	466	(dhcp->state == DHCP_RENEWING)) {
idinor	0:dcf3c92487ca	467	/* just retry to renew - note that the rebind timer (t2) will
idinor	0:dcf3c92487ca	468	* eventually time-out if renew tries fail. */
idinor	0:dcf3c92487ca	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
idinor	0:dcf3c92487ca	470	("dhcp_t1_timeout(): must renew\n"));
idinor	0:dcf3c92487ca	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
idinor	0:dcf3c92487ca	472	DHCP_RENEWING, not DHCP_BOUND */
idinor	0:dcf3c92487ca	473	dhcp_renew(netif);
idinor	0:dcf3c92487ca	474	}
idinor	0:dcf3c92487ca	475	}
idinor	0:dcf3c92487ca	476
idinor	0:dcf3c92487ca	477	/**
idinor	0:dcf3c92487ca	478	* The rebind period has timed out.
idinor	0:dcf3c92487ca	479	*
idinor	0:dcf3c92487ca	480	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	481	*/
idinor	0:dcf3c92487ca	482	static void
idinor	0:dcf3c92487ca	483	dhcp_t2_timeout(struct netif *netif)
idinor	0:dcf3c92487ca	484	{
idinor	0:dcf3c92487ca	485	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
idinor	0:dcf3c92487ca	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
idinor	0:dcf3c92487ca	488	(dhcp->state == DHCP_RENEWING)) {
idinor	0:dcf3c92487ca	489	/* just retry to rebind */
idinor	0:dcf3c92487ca	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
idinor	0:dcf3c92487ca	491	("dhcp_t2_timeout(): must rebind\n"));
idinor	0:dcf3c92487ca	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
idinor	0:dcf3c92487ca	493	DHCP_REBINDING, not DHCP_BOUND */
idinor	0:dcf3c92487ca	494	dhcp_rebind(netif);
idinor	0:dcf3c92487ca	495	}
idinor	0:dcf3c92487ca	496	}
idinor	0:dcf3c92487ca	497
idinor	0:dcf3c92487ca	498	/**
idinor	0:dcf3c92487ca	499	* Handle a DHCP ACK packet
idinor	0:dcf3c92487ca	500	*
idinor	0:dcf3c92487ca	501	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	502	*/
idinor	0:dcf3c92487ca	503	static void
idinor	0:dcf3c92487ca	504	dhcp_handle_ack(struct netif *netif)
idinor	0:dcf3c92487ca	505	{
idinor	0:dcf3c92487ca	506	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	507	#if LWIP_DNS
idinor	0:dcf3c92487ca	508	u8_t n;
idinor	0:dcf3c92487ca	509	#endif /* LWIP_DNS */
idinor	0:dcf3c92487ca	510
idinor	0:dcf3c92487ca	511	/* clear options we might not get from the ACK */
idinor	0:dcf3c92487ca	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
idinor	0:dcf3c92487ca	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
idinor	0:dcf3c92487ca	514	#if LWIP_DHCP_BOOTP_FILE
idinor	0:dcf3c92487ca	515	ip_addr_set_zero(&dhcp->offered_si_addr);
idinor	0:dcf3c92487ca	516	#endif /* LWIP_DHCP_BOOTP_FILE */
idinor	0:dcf3c92487ca	517
idinor	0:dcf3c92487ca	518	/* lease time given? */
idinor	0:dcf3c92487ca	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
idinor	0:dcf3c92487ca	520	/* remember offered lease time */
idinor	0:dcf3c92487ca	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
idinor	0:dcf3c92487ca	522	}
idinor	0:dcf3c92487ca	523	/* renewal period given? */
idinor	0:dcf3c92487ca	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
idinor	0:dcf3c92487ca	525	/* remember given renewal period */
idinor	0:dcf3c92487ca	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
idinor	0:dcf3c92487ca	527	} else {
idinor	0:dcf3c92487ca	528	/* calculate safe periods for renewal */
idinor	0:dcf3c92487ca	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
idinor	0:dcf3c92487ca	530	}
idinor	0:dcf3c92487ca	531
idinor	0:dcf3c92487ca	532	/* renewal period given? */
idinor	0:dcf3c92487ca	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
idinor	0:dcf3c92487ca	534	/* remember given rebind period */
idinor	0:dcf3c92487ca	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
idinor	0:dcf3c92487ca	536	} else {
idinor	0:dcf3c92487ca	537	/* calculate safe periods for rebinding */
idinor	0:dcf3c92487ca	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
idinor	0:dcf3c92487ca	539	}
idinor	0:dcf3c92487ca	540
idinor	0:dcf3c92487ca	541	/* (y)our internet address */
idinor	0:dcf3c92487ca	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
idinor	0:dcf3c92487ca	543
idinor	0:dcf3c92487ca	544	#if LWIP_DHCP_BOOTP_FILE
idinor	0:dcf3c92487ca	545	/* copy boot server address,
idinor	0:dcf3c92487ca	546	boot file name copied in dhcp_parse_reply if not overloaded */
idinor	0:dcf3c92487ca	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
idinor	0:dcf3c92487ca	548	#endif /* LWIP_DHCP_BOOTP_FILE */
idinor	0:dcf3c92487ca	549
idinor	0:dcf3c92487ca	550	/* subnet mask given? */
idinor	0:dcf3c92487ca	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
idinor	0:dcf3c92487ca	552	/* remember given subnet mask */
idinor	0:dcf3c92487ca	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
idinor	0:dcf3c92487ca	554	dhcp->subnet_mask_given = 1;
idinor	0:dcf3c92487ca	555	} else {
idinor	0:dcf3c92487ca	556	dhcp->subnet_mask_given = 0;
idinor	0:dcf3c92487ca	557	}
idinor	0:dcf3c92487ca	558
idinor	0:dcf3c92487ca	559	/* gateway router */
idinor	0:dcf3c92487ca	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
idinor	0:dcf3c92487ca	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
idinor	0:dcf3c92487ca	562	}
idinor	0:dcf3c92487ca	563
idinor	0:dcf3c92487ca	564	#if LWIP_DNS
idinor	0:dcf3c92487ca	565	/* DNS servers */
idinor	0:dcf3c92487ca	566	n = 0;
idinor	0:dcf3c92487ca	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
idinor	0:dcf3c92487ca	568	ip_addr_t dns_addr;
idinor	0:dcf3c92487ca	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
idinor	0:dcf3c92487ca	570	dns_setserver(n, &dns_addr);
idinor	0:dcf3c92487ca	571	n++;
idinor	0:dcf3c92487ca	572	}
idinor	0:dcf3c92487ca	573	#endif /* LWIP_DNS */
idinor	0:dcf3c92487ca	574	}
idinor	0:dcf3c92487ca	575
idinor	0:dcf3c92487ca	576	/** Set a statically allocated struct dhcp to work with.
idinor	0:dcf3c92487ca	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
idinor	0:dcf3c92487ca	578	*
idinor	0:dcf3c92487ca	579	* @param netif the netif for which to set the struct dhcp
idinor	0:dcf3c92487ca	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
idinor	0:dcf3c92487ca	581	*/
idinor	0:dcf3c92487ca	582	void
idinor	0:dcf3c92487ca	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
idinor	0:dcf3c92487ca	584	{
idinor	0:dcf3c92487ca	585	LWIP_ASSERT("netif != NULL", netif != NULL);
idinor	0:dcf3c92487ca	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
idinor	0:dcf3c92487ca	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
idinor	0:dcf3c92487ca	588
idinor	0:dcf3c92487ca	589	/* clear data structure */
idinor	0:dcf3c92487ca	590	memset(dhcp, 0, sizeof(struct dhcp));
idinor	0:dcf3c92487ca	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
idinor	0:dcf3c92487ca	592	netif->dhcp = dhcp;
idinor	0:dcf3c92487ca	593	}
idinor	0:dcf3c92487ca	594
idinor	0:dcf3c92487ca	595	/**
idinor	0:dcf3c92487ca	596	* Start DHCP negotiation for a network interface.
idinor	0:dcf3c92487ca	597	*
idinor	0:dcf3c92487ca	598	* If no DHCP client instance was attached to this interface,
idinor	0:dcf3c92487ca	599	* a new client is created first. If a DHCP client instance
idinor	0:dcf3c92487ca	600	* was already present, it restarts negotiation.
idinor	0:dcf3c92487ca	601	*
idinor	0:dcf3c92487ca	602	* @param netif The lwIP network interface
idinor	0:dcf3c92487ca	603	* @return lwIP error code
idinor	0:dcf3c92487ca	604	* - ERR_OK - No error
idinor	0:dcf3c92487ca	605	* - ERR_MEM - Out of memory
idinor	0:dcf3c92487ca	606	*/
idinor	0:dcf3c92487ca	607	err_t
idinor	0:dcf3c92487ca	608	dhcp_start(struct netif *netif)
idinor	0:dcf3c92487ca	609	{
idinor	0:dcf3c92487ca	610	struct dhcp *dhcp;
idinor	0:dcf3c92487ca	611	err_t result = ERR_OK;
idinor	0:dcf3c92487ca	612
idinor	0:dcf3c92487ca	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
idinor	0:dcf3c92487ca	614	dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	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));
idinor	0:dcf3c92487ca	616	/* Remove the flag that says this netif is handled by DHCP,
idinor	0:dcf3c92487ca	617	it is set when we succeeded starting. */
idinor	0:dcf3c92487ca	618	netif->flags &= ~NETIF_FLAG_DHCP;
idinor	0:dcf3c92487ca	619
idinor	0:dcf3c92487ca	620	/* check hwtype of the netif */
idinor	0:dcf3c92487ca	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
idinor	0:dcf3c92487ca	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
idinor	0:dcf3c92487ca	623	return ERR_ARG;
idinor	0:dcf3c92487ca	624	}
idinor	0:dcf3c92487ca	625
idinor	0:dcf3c92487ca	626	/* check MTU of the netif */
idinor	0:dcf3c92487ca	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
idinor	0:dcf3c92487ca	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
idinor	0:dcf3c92487ca	629	return ERR_MEM;
idinor	0:dcf3c92487ca	630	}
idinor	0:dcf3c92487ca	631
idinor	0:dcf3c92487ca	632	/* no DHCP client attached yet? */
idinor	0:dcf3c92487ca	633	if (dhcp == NULL) {
idinor	0:dcf3c92487ca	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
idinor	0:dcf3c92487ca	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
idinor	0:dcf3c92487ca	636	if (dhcp == NULL) {
idinor	0:dcf3c92487ca	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
idinor	0:dcf3c92487ca	638	return ERR_MEM;
idinor	0:dcf3c92487ca	639	}
idinor	0:dcf3c92487ca	640	/* store this dhcp client in the netif */
idinor	0:dcf3c92487ca	641	netif->dhcp = dhcp;
idinor	0:dcf3c92487ca	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
idinor	0:dcf3c92487ca	643	/* already has DHCP client attached */
idinor	0:dcf3c92487ca	644	} else {
idinor	0:dcf3c92487ca	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
idinor	0:dcf3c92487ca	646	if (dhcp->pcb != NULL) {
idinor	0:dcf3c92487ca	647	udp_remove(dhcp->pcb);
idinor	0:dcf3c92487ca	648	}
idinor	0:dcf3c92487ca	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
idinor	0:dcf3c92487ca	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
idinor	0:dcf3c92487ca	651	}
idinor	0:dcf3c92487ca	652
idinor	0:dcf3c92487ca	653	/* clear data structure */
idinor	0:dcf3c92487ca	654	memset(dhcp, 0, sizeof(struct dhcp));
idinor	0:dcf3c92487ca	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
idinor	0:dcf3c92487ca	656	/* allocate UDP PCB */
idinor	0:dcf3c92487ca	657	dhcp->pcb = udp_new();
idinor	0:dcf3c92487ca	658	if (dhcp->pcb == NULL) {
idinor	0:dcf3c92487ca	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
idinor	0:dcf3c92487ca	660	return ERR_MEM;
idinor	0:dcf3c92487ca	661	}
idinor	0:dcf3c92487ca	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
idinor	0:dcf3c92487ca	663	/* set up local and remote port for the pcb */
idinor	0:dcf3c92487ca	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
idinor	0:dcf3c92487ca	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
idinor	0:dcf3c92487ca	666	/* set up the recv callback and argument */
idinor	0:dcf3c92487ca	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
idinor	0:dcf3c92487ca	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
idinor	0:dcf3c92487ca	669	/* (re)start the DHCP negotiation */
idinor	0:dcf3c92487ca	670	result = dhcp_discover(netif);
idinor	0:dcf3c92487ca	671	if (result != ERR_OK) {
idinor	0:dcf3c92487ca	672	/* free resources allocated above */
idinor	0:dcf3c92487ca	673	dhcp_stop(netif);
idinor	0:dcf3c92487ca	674	return ERR_MEM;
idinor	0:dcf3c92487ca	675	}
idinor	0:dcf3c92487ca	676	/* Set the flag that says this netif is handled by DHCP. */
idinor	0:dcf3c92487ca	677	netif->flags \|= NETIF_FLAG_DHCP;
idinor	0:dcf3c92487ca	678	return result;
idinor	0:dcf3c92487ca	679	}
idinor	0:dcf3c92487ca	680
idinor	0:dcf3c92487ca	681	/**
idinor	0:dcf3c92487ca	682	* Inform a DHCP server of our manual configuration.
idinor	0:dcf3c92487ca	683	*
idinor	0:dcf3c92487ca	684	* This informs DHCP servers of our fixed IP address configuration
idinor	0:dcf3c92487ca	685	* by sending an INFORM message. It does not involve DHCP address
idinor	0:dcf3c92487ca	686	* configuration, it is just here to be nice to the network.
idinor	0:dcf3c92487ca	687	*
idinor	0:dcf3c92487ca	688	* @param netif The lwIP network interface
idinor	0:dcf3c92487ca	689	*/
idinor	0:dcf3c92487ca	690	void
idinor	0:dcf3c92487ca	691	dhcp_inform(struct netif *netif)
idinor	0:dcf3c92487ca	692	{
idinor	0:dcf3c92487ca	693	struct dhcp dhcp;
idinor	0:dcf3c92487ca	694	err_t result = ERR_OK;
idinor	0:dcf3c92487ca	695	struct udp_pcb *pcb;
idinor	0:dcf3c92487ca	696
idinor	0:dcf3c92487ca	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
idinor	0:dcf3c92487ca	698
idinor	0:dcf3c92487ca	699	memset(&dhcp, 0, sizeof(struct dhcp));
idinor	0:dcf3c92487ca	700	dhcp_set_state(&dhcp, DHCP_INFORM);
idinor	0:dcf3c92487ca	701
idinor	0:dcf3c92487ca	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
idinor	0:dcf3c92487ca	703	/* re-use existing pcb */
idinor	0:dcf3c92487ca	704	pcb = netif->dhcp->pcb;
idinor	0:dcf3c92487ca	705	} else {
idinor	0:dcf3c92487ca	706	pcb = udp_new();
idinor	0:dcf3c92487ca	707	if (pcb == NULL) {
idinor	0:dcf3c92487ca	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
idinor	0:dcf3c92487ca	709	return;
idinor	0:dcf3c92487ca	710	}
idinor	0:dcf3c92487ca	711	dhcp.pcb = pcb;
idinor	0:dcf3c92487ca	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
idinor	0:dcf3c92487ca	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
idinor	0:dcf3c92487ca	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
idinor	0:dcf3c92487ca	715	}
idinor	0:dcf3c92487ca	716	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
idinor	0:dcf3c92487ca	718	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
idinor	0:dcf3c92487ca	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
idinor	0:dcf3c92487ca	721
idinor	0:dcf3c92487ca	722	dhcp_option_trailer(&dhcp);
idinor	0:dcf3c92487ca	723
idinor	0:dcf3c92487ca	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
idinor	0:dcf3c92487ca	725
idinor	0:dcf3c92487ca	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
idinor	0:dcf3c92487ca	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	728	dhcp_delete_msg(&dhcp);
idinor	0:dcf3c92487ca	729	} else {
idinor	0:dcf3c92487ca	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	731	}
idinor	0:dcf3c92487ca	732
idinor	0:dcf3c92487ca	733	if (dhcp.pcb != NULL) {
idinor	0:dcf3c92487ca	734	/* otherwise, the existing pcb was used */
idinor	0:dcf3c92487ca	735	udp_remove(dhcp.pcb);
idinor	0:dcf3c92487ca	736	}
idinor	0:dcf3c92487ca	737	}
idinor	0:dcf3c92487ca	738
idinor	0:dcf3c92487ca	739	/** Handle a possible change in the network configuration.
idinor	0:dcf3c92487ca	740	*
idinor	0:dcf3c92487ca	741	* This enters the REBOOTING state to verify that the currently bound
idinor	0:dcf3c92487ca	742	* address is still valid.
idinor	0:dcf3c92487ca	743	*/
idinor	0:dcf3c92487ca	744	void
idinor	0:dcf3c92487ca	745	dhcp_network_changed(struct netif *netif)
idinor	0:dcf3c92487ca	746	{
idinor	0:dcf3c92487ca	747	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	748	if (!dhcp)
idinor	0:dcf3c92487ca	749	return;
idinor	0:dcf3c92487ca	750	switch (dhcp->state) {
idinor	0:dcf3c92487ca	751	case DHCP_REBINDING:
idinor	0:dcf3c92487ca	752	case DHCP_RENEWING:
idinor	0:dcf3c92487ca	753	case DHCP_BOUND:
idinor	0:dcf3c92487ca	754	case DHCP_REBOOTING:
idinor	0:dcf3c92487ca	755	netif_set_down(netif);
idinor	0:dcf3c92487ca	756	dhcp->tries = 0;
idinor	0:dcf3c92487ca	757	dhcp_reboot(netif);
idinor	0:dcf3c92487ca	758	break;
idinor	0:dcf3c92487ca	759	case DHCP_OFF:
idinor	0:dcf3c92487ca	760	/* stay off */
idinor	0:dcf3c92487ca	761	break;
idinor	0:dcf3c92487ca	762	default:
idinor	0:dcf3c92487ca	763	dhcp->tries = 0;
idinor	0:dcf3c92487ca	764	#if LWIP_DHCP_AUTOIP_COOP
idinor	0:dcf3c92487ca	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
idinor	0:dcf3c92487ca	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
idinor	0:dcf3c92487ca	767	dhcp_discover(netif);
idinor	0:dcf3c92487ca	768	break;
idinor	0:dcf3c92487ca	769	}
idinor	0:dcf3c92487ca	770	}
idinor	0:dcf3c92487ca	771
idinor	0:dcf3c92487ca	772	#if DHCP_DOES_ARP_CHECK
idinor	0:dcf3c92487ca	773	/**
idinor	0:dcf3c92487ca	774	* Match an ARP reply with the offered IP address.
idinor	0:dcf3c92487ca	775	*
idinor	0:dcf3c92487ca	776	* @param netif the network interface on which the reply was received
idinor	0:dcf3c92487ca	777	* @param addr The IP address we received a reply from
idinor	0:dcf3c92487ca	778	*/
idinor	0:dcf3c92487ca	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
idinor	0:dcf3c92487ca	780	{
idinor	0:dcf3c92487ca	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
idinor	0:dcf3c92487ca	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
idinor	0:dcf3c92487ca	783	/* is a DHCP client doing an ARP check? */
idinor	0:dcf3c92487ca	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
idinor	0:dcf3c92487ca	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
idinor	0:dcf3c92487ca	786	ip4_addr_get_u32(addr)));
idinor	0:dcf3c92487ca	787	/* did a host respond with the address we
idinor	0:dcf3c92487ca	788	were offered by the DHCP server? */
idinor	0:dcf3c92487ca	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
idinor	0:dcf3c92487ca	790	/* we will not accept the offered address */
idinor	0:dcf3c92487ca	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
idinor	0:dcf3c92487ca	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
idinor	0:dcf3c92487ca	793	dhcp_decline(netif);
idinor	0:dcf3c92487ca	794	}
idinor	0:dcf3c92487ca	795	}
idinor	0:dcf3c92487ca	796	}
idinor	0:dcf3c92487ca	797
idinor	0:dcf3c92487ca	798	/**
idinor	0:dcf3c92487ca	799	* Decline an offered lease.
idinor	0:dcf3c92487ca	800	*
idinor	0:dcf3c92487ca	801	* Tell the DHCP server we do not accept the offered address.
idinor	0:dcf3c92487ca	802	* One reason to decline the lease is when we find out the address
idinor	0:dcf3c92487ca	803	* is already in use by another host (through ARP).
idinor	0:dcf3c92487ca	804	*
idinor	0:dcf3c92487ca	805	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	806	*/
idinor	0:dcf3c92487ca	807	static err_t
idinor	0:dcf3c92487ca	808	dhcp_decline(struct netif *netif)
idinor	0:dcf3c92487ca	809	{
idinor	0:dcf3c92487ca	810	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	811	err_t result = ERR_OK;
idinor	0:dcf3c92487ca	812	u16_t msecs;
idinor	0:dcf3c92487ca	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
idinor	0:dcf3c92487ca	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
idinor	0:dcf3c92487ca	815	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
idinor	0:dcf3c92487ca	817	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
idinor	0:dcf3c92487ca	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
idinor	0:dcf3c92487ca	820
idinor	0:dcf3c92487ca	821	dhcp_option_trailer(dhcp);
idinor	0:dcf3c92487ca	822	/* resize pbuf to reflect true size of options */
idinor	0:dcf3c92487ca	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
idinor	0:dcf3c92487ca	824
idinor	0:dcf3c92487ca	825	/* per section 4.4.4, broadcast DECLINE messages */
idinor	0:dcf3c92487ca	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	827	dhcp_delete_msg(dhcp);
idinor	0:dcf3c92487ca	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
idinor	0:dcf3c92487ca	829	} else {
idinor	0:dcf3c92487ca	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	831	("dhcp_decline: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	832	}
idinor	0:dcf3c92487ca	833	dhcp->tries++;
idinor	0:dcf3c92487ca	834	msecs = 10*1000;
idinor	0:dcf3c92487ca	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	837	return result;
idinor	0:dcf3c92487ca	838	}
idinor	0:dcf3c92487ca	839	#endif /* DHCP_DOES_ARP_CHECK */
idinor	0:dcf3c92487ca	840
idinor	0:dcf3c92487ca	841
idinor	0:dcf3c92487ca	842	/**
idinor	0:dcf3c92487ca	843	* Start the DHCP process, discover a DHCP server.
idinor	0:dcf3c92487ca	844	*
idinor	0:dcf3c92487ca	845	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	846	*/
idinor	0:dcf3c92487ca	847	static err_t
idinor	0:dcf3c92487ca	848	dhcp_discover(struct netif *netif)
idinor	0:dcf3c92487ca	849	{
idinor	0:dcf3c92487ca	850	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	851	err_t result = ERR_OK;
idinor	0:dcf3c92487ca	852	u16_t msecs;
idinor	0:dcf3c92487ca	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
idinor	0:dcf3c92487ca	854	ip_addr_set_any(&dhcp->offered_ip_addr);
idinor	0:dcf3c92487ca	855	dhcp_set_state(dhcp, DHCP_SELECTING);
idinor	0:dcf3c92487ca	856	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
idinor	0:dcf3c92487ca	858	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
idinor	0:dcf3c92487ca	860
idinor	0:dcf3c92487ca	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
idinor	0:dcf3c92487ca	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
idinor	0:dcf3c92487ca	863
idinor	0:dcf3c92487ca	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
idinor	0:dcf3c92487ca	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
idinor	0:dcf3c92487ca	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
idinor	0:dcf3c92487ca	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
idinor	0:dcf3c92487ca	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
idinor	0:dcf3c92487ca	869
idinor	0:dcf3c92487ca	870	dhcp_option_trailer(dhcp);
idinor	0:dcf3c92487ca	871
idinor	0:dcf3c92487ca	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
idinor	0:dcf3c92487ca	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
idinor	0:dcf3c92487ca	874
idinor	0:dcf3c92487ca	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
idinor	0:dcf3c92487ca	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
idinor	0:dcf3c92487ca	878	dhcp_delete_msg(dhcp);
idinor	0:dcf3c92487ca	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
idinor	0:dcf3c92487ca	880	} else {
idinor	0:dcf3c92487ca	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	882	}
idinor	0:dcf3c92487ca	883	dhcp->tries++;
idinor	0:dcf3c92487ca	884	#if LWIP_DHCP_AUTOIP_COOP
idinor	0:dcf3c92487ca	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
idinor	0:dcf3c92487ca	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
idinor	0:dcf3c92487ca	887	autoip_start(netif);
idinor	0:dcf3c92487ca	888	}
idinor	0:dcf3c92487ca	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
idinor	0:dcf3c92487ca	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
idinor	0:dcf3c92487ca	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	893	return result;
idinor	0:dcf3c92487ca	894	}
idinor	0:dcf3c92487ca	895
idinor	0:dcf3c92487ca	896
idinor	0:dcf3c92487ca	897	/**
idinor	0:dcf3c92487ca	898	* Bind the interface to the offered IP address.
idinor	0:dcf3c92487ca	899	*
idinor	0:dcf3c92487ca	900	* @param netif network interface to bind to the offered address
idinor	0:dcf3c92487ca	901	*/
idinor	0:dcf3c92487ca	902	static void
idinor	0:dcf3c92487ca	903	dhcp_bind(struct netif *netif)
idinor	0:dcf3c92487ca	904	{
idinor	0:dcf3c92487ca	905	u32_t timeout;
idinor	0:dcf3c92487ca	906	struct dhcp *dhcp;
idinor	0:dcf3c92487ca	907	ip_addr_t sn_mask, gw_addr;
idinor	0:dcf3c92487ca	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
idinor	0:dcf3c92487ca	909	dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
idinor	0:dcf3c92487ca	911	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
idinor	0:dcf3c92487ca	912
idinor	0:dcf3c92487ca	913	/* temporary DHCP lease? */
idinor	0:dcf3c92487ca	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
idinor	0:dcf3c92487ca	915	/* set renewal period timer */
idinor	0:dcf3c92487ca	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
idinor	0:dcf3c92487ca	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
idinor	0:dcf3c92487ca	918	if(timeout > 0xffff) {
idinor	0:dcf3c92487ca	919	timeout = 0xffff;
idinor	0:dcf3c92487ca	920	}
idinor	0:dcf3c92487ca	921	dhcp->t1_timeout = (u16_t)timeout;
idinor	0:dcf3c92487ca	922	if (dhcp->t1_timeout == 0) {
idinor	0:dcf3c92487ca	923	dhcp->t1_timeout = 1;
idinor	0:dcf3c92487ca	924	}
idinor	0:dcf3c92487ca	925	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
idinor	0:dcf3c92487ca	926	}
idinor	0:dcf3c92487ca	927	/* set renewal period timer */
idinor	0:dcf3c92487ca	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
idinor	0:dcf3c92487ca	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
idinor	0:dcf3c92487ca	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
idinor	0:dcf3c92487ca	931	if(timeout > 0xffff) {
idinor	0:dcf3c92487ca	932	timeout = 0xffff;
idinor	0:dcf3c92487ca	933	}
idinor	0:dcf3c92487ca	934	dhcp->t2_timeout = (u16_t)timeout;
idinor	0:dcf3c92487ca	935	if (dhcp->t2_timeout == 0) {
idinor	0:dcf3c92487ca	936	dhcp->t2_timeout = 1;
idinor	0:dcf3c92487ca	937	}
idinor	0:dcf3c92487ca	938	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
idinor	0:dcf3c92487ca	939	}
idinor	0:dcf3c92487ca	940
idinor	0:dcf3c92487ca	941	if (dhcp->subnet_mask_given) {
idinor	0:dcf3c92487ca	942	/* copy offered network mask */
idinor	0:dcf3c92487ca	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
idinor	0:dcf3c92487ca	944	} else {
idinor	0:dcf3c92487ca	945	/* subnet mask not given, choose a safe subnet mask given the network class */
idinor	0:dcf3c92487ca	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
idinor	0:dcf3c92487ca	947	if (first_octet <= 127) {
idinor	0:dcf3c92487ca	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
idinor	0:dcf3c92487ca	949	} else if (first_octet >= 192) {
idinor	0:dcf3c92487ca	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
idinor	0:dcf3c92487ca	951	} else {
idinor	0:dcf3c92487ca	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
idinor	0:dcf3c92487ca	953	}
idinor	0:dcf3c92487ca	954	}
idinor	0:dcf3c92487ca	955
idinor	0:dcf3c92487ca	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
idinor	0:dcf3c92487ca	957	/* gateway address not given? */
idinor	0:dcf3c92487ca	958	if (ip_addr_isany(&gw_addr)) {
idinor	0:dcf3c92487ca	959	/* copy network address */
idinor	0:dcf3c92487ca	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
idinor	0:dcf3c92487ca	961	/* use first host address on network as gateway */
idinor	0:dcf3c92487ca	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
idinor	0:dcf3c92487ca	963	}
idinor	0:dcf3c92487ca	964
idinor	0:dcf3c92487ca	965	#if LWIP_DHCP_AUTOIP_COOP
idinor	0:dcf3c92487ca	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
idinor	0:dcf3c92487ca	967	autoip_stop(netif);
idinor	0:dcf3c92487ca	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
idinor	0:dcf3c92487ca	969	}
idinor	0:dcf3c92487ca	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
idinor	0:dcf3c92487ca	971
idinor	0:dcf3c92487ca	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
idinor	0:dcf3c92487ca	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
idinor	0:dcf3c92487ca	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
idinor	0:dcf3c92487ca	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
idinor	0:dcf3c92487ca	976	ip4_addr_get_u32(&sn_mask)));
idinor	0:dcf3c92487ca	977	netif_set_netmask(netif, &sn_mask);
idinor	0:dcf3c92487ca	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
idinor	0:dcf3c92487ca	979	ip4_addr_get_u32(&gw_addr)));
idinor	0:dcf3c92487ca	980	netif_set_gw(netif, &gw_addr);
idinor	0:dcf3c92487ca	981	/* bring the interface up */
idinor	0:dcf3c92487ca	982	netif_set_up(netif);
idinor	0:dcf3c92487ca	983	/* netif is now bound to DHCP leased address */
idinor	0:dcf3c92487ca	984	dhcp_set_state(dhcp, DHCP_BOUND);
idinor	0:dcf3c92487ca	985	}
idinor	0:dcf3c92487ca	986
idinor	0:dcf3c92487ca	987	/**
idinor	0:dcf3c92487ca	988	* Renew an existing DHCP lease at the involved DHCP server.
idinor	0:dcf3c92487ca	989	*
idinor	0:dcf3c92487ca	990	* @param netif network interface which must renew its lease
idinor	0:dcf3c92487ca	991	*/
idinor	0:dcf3c92487ca	992	err_t
idinor	0:dcf3c92487ca	993	dhcp_renew(struct netif *netif)
idinor	0:dcf3c92487ca	994	{
idinor	0:dcf3c92487ca	995	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	996	err_t result;
idinor	0:dcf3c92487ca	997	u16_t msecs;
idinor	0:dcf3c92487ca	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
idinor	0:dcf3c92487ca	999	dhcp_set_state(dhcp, DHCP_RENEWING);
idinor	0:dcf3c92487ca	1000
idinor	0:dcf3c92487ca	1001	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
idinor	0:dcf3c92487ca	1003	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
idinor	0:dcf3c92487ca	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
idinor	0:dcf3c92487ca	1006
idinor	0:dcf3c92487ca	1007	#if LWIP_NETIF_HOSTNAME
idinor	0:dcf3c92487ca	1008	if (netif->hostname != NULL) {
idinor	0:dcf3c92487ca	1009	const char p = (const char)netif->hostname;
idinor	0:dcf3c92487ca	1010	u8_t namelen = (u8_t)strlen(p);
idinor	0:dcf3c92487ca	1011	if (namelen > 0) {
idinor	0:dcf3c92487ca	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
idinor	0:dcf3c92487ca	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
idinor	0:dcf3c92487ca	1014	while (*p) {
idinor	0:dcf3c92487ca	1015	dhcp_option_byte(dhcp, *p++);
idinor	0:dcf3c92487ca	1016	}
idinor	0:dcf3c92487ca	1017	}
idinor	0:dcf3c92487ca	1018	}
idinor	0:dcf3c92487ca	1019	#endif /* LWIP_NETIF_HOSTNAME */
idinor	0:dcf3c92487ca	1020
idinor	0:dcf3c92487ca	1021	#if 0
idinor	0:dcf3c92487ca	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
idinor	0:dcf3c92487ca	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
idinor	0:dcf3c92487ca	1024	#endif
idinor	0:dcf3c92487ca	1025
idinor	0:dcf3c92487ca	1026	#if 0
idinor	0:dcf3c92487ca	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
idinor	0:dcf3c92487ca	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
idinor	0:dcf3c92487ca	1029	#endif
idinor	0:dcf3c92487ca	1030	/* append DHCP message trailer */
idinor	0:dcf3c92487ca	1031	dhcp_option_trailer(dhcp);
idinor	0:dcf3c92487ca	1032
idinor	0:dcf3c92487ca	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
idinor	0:dcf3c92487ca	1034
idinor	0:dcf3c92487ca	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	1036	dhcp_delete_msg(dhcp);
idinor	0:dcf3c92487ca	1037
idinor	0:dcf3c92487ca	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
idinor	0:dcf3c92487ca	1039	} else {
idinor	0:dcf3c92487ca	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	1041	}
idinor	0:dcf3c92487ca	1042	dhcp->tries++;
idinor	0:dcf3c92487ca	1043	/* back-off on retries, but to a maximum of 20 seconds */
idinor	0:dcf3c92487ca	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
idinor	0:dcf3c92487ca	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	1047	return result;
idinor	0:dcf3c92487ca	1048	}
idinor	0:dcf3c92487ca	1049
idinor	0:dcf3c92487ca	1050	/**
idinor	0:dcf3c92487ca	1051	* Rebind with a DHCP server for an existing DHCP lease.
idinor	0:dcf3c92487ca	1052	*
idinor	0:dcf3c92487ca	1053	* @param netif network interface which must rebind with a DHCP server
idinor	0:dcf3c92487ca	1054	*/
idinor	0:dcf3c92487ca	1055	static err_t
idinor	0:dcf3c92487ca	1056	dhcp_rebind(struct netif *netif)
idinor	0:dcf3c92487ca	1057	{
idinor	0:dcf3c92487ca	1058	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	1059	err_t result;
idinor	0:dcf3c92487ca	1060	u16_t msecs;
idinor	0:dcf3c92487ca	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
idinor	0:dcf3c92487ca	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
idinor	0:dcf3c92487ca	1063
idinor	0:dcf3c92487ca	1064	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
idinor	0:dcf3c92487ca	1066	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
idinor	0:dcf3c92487ca	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
idinor	0:dcf3c92487ca	1069
idinor	0:dcf3c92487ca	1070	#if LWIP_NETIF_HOSTNAME
idinor	0:dcf3c92487ca	1071	if (netif->hostname != NULL) {
idinor	0:dcf3c92487ca	1072	const char p = (const char)netif->hostname;
idinor	0:dcf3c92487ca	1073	u8_t namelen = (u8_t)strlen(p);
idinor	0:dcf3c92487ca	1074	if (namelen > 0) {
idinor	0:dcf3c92487ca	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
idinor	0:dcf3c92487ca	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
idinor	0:dcf3c92487ca	1077	while (*p) {
idinor	0:dcf3c92487ca	1078	dhcp_option_byte(dhcp, *p++);
idinor	0:dcf3c92487ca	1079	}
idinor	0:dcf3c92487ca	1080	}
idinor	0:dcf3c92487ca	1081	}
idinor	0:dcf3c92487ca	1082	#endif /* LWIP_NETIF_HOSTNAME */
idinor	0:dcf3c92487ca	1083
idinor	0:dcf3c92487ca	1084	#if 0
idinor	0:dcf3c92487ca	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
idinor	0:dcf3c92487ca	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
idinor	0:dcf3c92487ca	1087
idinor	0:dcf3c92487ca	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
idinor	0:dcf3c92487ca	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
idinor	0:dcf3c92487ca	1090	#endif
idinor	0:dcf3c92487ca	1091
idinor	0:dcf3c92487ca	1092	dhcp_option_trailer(dhcp);
idinor	0:dcf3c92487ca	1093
idinor	0:dcf3c92487ca	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
idinor	0:dcf3c92487ca	1095
idinor	0:dcf3c92487ca	1096	/* broadcast to server */
idinor	0:dcf3c92487ca	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	1098	dhcp_delete_msg(dhcp);
idinor	0:dcf3c92487ca	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
idinor	0:dcf3c92487ca	1100	} else {
idinor	0:dcf3c92487ca	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	1102	}
idinor	0:dcf3c92487ca	1103	dhcp->tries++;
idinor	0:dcf3c92487ca	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
idinor	0:dcf3c92487ca	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	1107	return result;
idinor	0:dcf3c92487ca	1108	}
idinor	0:dcf3c92487ca	1109
idinor	0:dcf3c92487ca	1110	/**
idinor	0:dcf3c92487ca	1111	* Enter REBOOTING state to verify an existing lease
idinor	0:dcf3c92487ca	1112	*
idinor	0:dcf3c92487ca	1113	* @param netif network interface which must reboot
idinor	0:dcf3c92487ca	1114	*/
idinor	0:dcf3c92487ca	1115	static err_t
idinor	0:dcf3c92487ca	1116	dhcp_reboot(struct netif *netif)
idinor	0:dcf3c92487ca	1117	{
idinor	0:dcf3c92487ca	1118	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	1119	err_t result;
idinor	0:dcf3c92487ca	1120	u16_t msecs;
idinor	0:dcf3c92487ca	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
idinor	0:dcf3c92487ca	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
idinor	0:dcf3c92487ca	1123
idinor	0:dcf3c92487ca	1124	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
idinor	0:dcf3c92487ca	1126	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
idinor	0:dcf3c92487ca	1128	dhcp_option_short(dhcp, 576);
idinor	0:dcf3c92487ca	1129
idinor	0:dcf3c92487ca	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
idinor	0:dcf3c92487ca	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
idinor	0:dcf3c92487ca	1132
idinor	0:dcf3c92487ca	1133	dhcp_option_trailer(dhcp);
idinor	0:dcf3c92487ca	1134
idinor	0:dcf3c92487ca	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
idinor	0:dcf3c92487ca	1136
idinor	0:dcf3c92487ca	1137	/* broadcast to server */
idinor	0:dcf3c92487ca	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	1139	dhcp_delete_msg(dhcp);
idinor	0:dcf3c92487ca	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
idinor	0:dcf3c92487ca	1141	} else {
idinor	0:dcf3c92487ca	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	1143	}
idinor	0:dcf3c92487ca	1144	dhcp->tries++;
idinor	0:dcf3c92487ca	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
idinor	0:dcf3c92487ca	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	1148	return result;
idinor	0:dcf3c92487ca	1149	}
idinor	0:dcf3c92487ca	1150
idinor	0:dcf3c92487ca	1151
idinor	0:dcf3c92487ca	1152	/**
idinor	0:dcf3c92487ca	1153	* Release a DHCP lease.
idinor	0:dcf3c92487ca	1154	*
idinor	0:dcf3c92487ca	1155	* @param netif network interface which must release its lease
idinor	0:dcf3c92487ca	1156	*/
idinor	0:dcf3c92487ca	1157	err_t
idinor	0:dcf3c92487ca	1158	dhcp_release(struct netif *netif)
idinor	0:dcf3c92487ca	1159	{
idinor	0:dcf3c92487ca	1160	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	1161	err_t result;
idinor	0:dcf3c92487ca	1162	u16_t msecs;
idinor	0:dcf3c92487ca	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
idinor	0:dcf3c92487ca	1164
idinor	0:dcf3c92487ca	1165	/* idle DHCP client */
idinor	0:dcf3c92487ca	1166	dhcp_set_state(dhcp, DHCP_OFF);
idinor	0:dcf3c92487ca	1167	/* clean old DHCP offer */
idinor	0:dcf3c92487ca	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
idinor	0:dcf3c92487ca	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
idinor	0:dcf3c92487ca	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
idinor	0:dcf3c92487ca	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
idinor	0:dcf3c92487ca	1172	#if LWIP_DHCP_BOOTP_FILE
idinor	0:dcf3c92487ca	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
idinor	0:dcf3c92487ca	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
idinor	0:dcf3c92487ca	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
idinor	0:dcf3c92487ca	1176
idinor	0:dcf3c92487ca	1177	/* create and initialize the DHCP message header */
idinor	0:dcf3c92487ca	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
idinor	0:dcf3c92487ca	1179	if (result == ERR_OK) {
idinor	0:dcf3c92487ca	1180	dhcp_option_trailer(dhcp);
idinor	0:dcf3c92487ca	1181
idinor	0:dcf3c92487ca	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
idinor	0:dcf3c92487ca	1183
idinor	0:dcf3c92487ca	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
idinor	0:dcf3c92487ca	1185	dhcp_delete_msg(dhcp);
idinor	0:dcf3c92487ca	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
idinor	0:dcf3c92487ca	1187	} else {
idinor	0:dcf3c92487ca	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
idinor	0:dcf3c92487ca	1189	}
idinor	0:dcf3c92487ca	1190	dhcp->tries++;
idinor	0:dcf3c92487ca	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
idinor	0:dcf3c92487ca	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
idinor	0:dcf3c92487ca	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
idinor	0:dcf3c92487ca	1194	/* bring the interface down */
idinor	0:dcf3c92487ca	1195	netif_set_down(netif);
idinor	0:dcf3c92487ca	1196	/* remove IP address from interface */
idinor	0:dcf3c92487ca	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
idinor	0:dcf3c92487ca	1198	netif_set_gw(netif, IP_ADDR_ANY);
idinor	0:dcf3c92487ca	1199	netif_set_netmask(netif, IP_ADDR_ANY);
idinor	0:dcf3c92487ca	1200
idinor	0:dcf3c92487ca	1201	return result;
idinor	0:dcf3c92487ca	1202	}
idinor	0:dcf3c92487ca	1203
idinor	0:dcf3c92487ca	1204	/**
idinor	0:dcf3c92487ca	1205	* Remove the DHCP client from the interface.
idinor	0:dcf3c92487ca	1206	*
idinor	0:dcf3c92487ca	1207	* @param netif The network interface to stop DHCP on
idinor	0:dcf3c92487ca	1208	*/
idinor	0:dcf3c92487ca	1209	void
idinor	0:dcf3c92487ca	1210	dhcp_stop(struct netif *netif)
idinor	0:dcf3c92487ca	1211	{
idinor	0:dcf3c92487ca	1212	struct dhcp *dhcp;
idinor	0:dcf3c92487ca	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
idinor	0:dcf3c92487ca	1214	dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	1215	/* Remove the flag that says this netif is handled by DHCP. */
idinor	0:dcf3c92487ca	1216	netif->flags &= ~NETIF_FLAG_DHCP;
idinor	0:dcf3c92487ca	1217
idinor	0:dcf3c92487ca	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
idinor	0:dcf3c92487ca	1219	/* netif is DHCP configured? */
idinor	0:dcf3c92487ca	1220	if (dhcp != NULL) {
idinor	0:dcf3c92487ca	1221	#if LWIP_DHCP_AUTOIP_COOP
idinor	0:dcf3c92487ca	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
idinor	0:dcf3c92487ca	1223	autoip_stop(netif);
idinor	0:dcf3c92487ca	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
idinor	0:dcf3c92487ca	1225	}
idinor	0:dcf3c92487ca	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
idinor	0:dcf3c92487ca	1227
idinor	0:dcf3c92487ca	1228	if (dhcp->pcb != NULL) {
idinor	0:dcf3c92487ca	1229	udp_remove(dhcp->pcb);
idinor	0:dcf3c92487ca	1230	dhcp->pcb = NULL;
idinor	0:dcf3c92487ca	1231	}
idinor	0:dcf3c92487ca	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
idinor	0:dcf3c92487ca	1233	dhcp_set_state(dhcp, DHCP_OFF);
idinor	0:dcf3c92487ca	1234	}
idinor	0:dcf3c92487ca	1235	}
idinor	0:dcf3c92487ca	1236
idinor	0:dcf3c92487ca	1237	/*
idinor	0:dcf3c92487ca	1238	* Set the DHCP state of a DHCP client.
idinor	0:dcf3c92487ca	1239	*
idinor	0:dcf3c92487ca	1240	* If the state changed, reset the number of tries.
idinor	0:dcf3c92487ca	1241	*/
idinor	0:dcf3c92487ca	1242	static void
idinor	0:dcf3c92487ca	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
idinor	0:dcf3c92487ca	1244	{
idinor	0:dcf3c92487ca	1245	if (new_state != dhcp->state) {
idinor	0:dcf3c92487ca	1246	dhcp->state = new_state;
idinor	0:dcf3c92487ca	1247	dhcp->tries = 0;
idinor	0:dcf3c92487ca	1248	dhcp->request_timeout = 0;
idinor	0:dcf3c92487ca	1249	}
idinor	0:dcf3c92487ca	1250	}
idinor	0:dcf3c92487ca	1251
idinor	0:dcf3c92487ca	1252	/*
idinor	0:dcf3c92487ca	1253	* Concatenate an option type and length field to the outgoing
idinor	0:dcf3c92487ca	1254	* DHCP message.
idinor	0:dcf3c92487ca	1255	*
idinor	0:dcf3c92487ca	1256	*/
idinor	0:dcf3c92487ca	1257	static void
idinor	0:dcf3c92487ca	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
idinor	0:dcf3c92487ca	1259	{
idinor	0:dcf3c92487ca	1260	LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
idinor	0:dcf3c92487ca	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
idinor	0:dcf3c92487ca	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
idinor	0:dcf3c92487ca	1263	}
idinor	0:dcf3c92487ca	1264	/*
idinor	0:dcf3c92487ca	1265	* Concatenate a single byte to the outgoing DHCP message.
idinor	0:dcf3c92487ca	1266	*
idinor	0:dcf3c92487ca	1267	*/
idinor	0:dcf3c92487ca	1268	static void
idinor	0:dcf3c92487ca	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
idinor	0:dcf3c92487ca	1270	{
idinor	0:dcf3c92487ca	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
idinor	0:dcf3c92487ca	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
idinor	0:dcf3c92487ca	1273	}
idinor	0:dcf3c92487ca	1274
idinor	0:dcf3c92487ca	1275	static void
idinor	0:dcf3c92487ca	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
idinor	0:dcf3c92487ca	1277	{
idinor	0:dcf3c92487ca	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
idinor	0:dcf3c92487ca	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
idinor	0:dcf3c92487ca	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
idinor	0:dcf3c92487ca	1281	}
idinor	0:dcf3c92487ca	1282
idinor	0:dcf3c92487ca	1283	static void
idinor	0:dcf3c92487ca	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
idinor	0:dcf3c92487ca	1285	{
idinor	0:dcf3c92487ca	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
idinor	0:dcf3c92487ca	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
idinor	0:dcf3c92487ca	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
idinor	0:dcf3c92487ca	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
idinor	0:dcf3c92487ca	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
idinor	0:dcf3c92487ca	1291	}
idinor	0:dcf3c92487ca	1292
idinor	0:dcf3c92487ca	1293	/**
idinor	0:dcf3c92487ca	1294	* Extract the DHCP message and the DHCP options.
idinor	0:dcf3c92487ca	1295	*
idinor	0:dcf3c92487ca	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
idinor	0:dcf3c92487ca	1297	* piece of memory. As a DHCP message is variable sized by its options,
idinor	0:dcf3c92487ca	1298	* and also allows overriding some fields for options, the easy approach
idinor	0:dcf3c92487ca	1299	* is to first unfold the options into a conitguous piece of memory, and
idinor	0:dcf3c92487ca	1300	* use that further on.
idinor	0:dcf3c92487ca	1301	*
idinor	0:dcf3c92487ca	1302	*/
idinor	0:dcf3c92487ca	1303	static err_t
idinor	0:dcf3c92487ca	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
idinor	0:dcf3c92487ca	1305	{
idinor	0:dcf3c92487ca	1306	u8_t *options;
idinor	0:dcf3c92487ca	1307	u16_t offset;
idinor	0:dcf3c92487ca	1308	u16_t offset_max;
idinor	0:dcf3c92487ca	1309	u16_t options_idx;
idinor	0:dcf3c92487ca	1310	u16_t options_idx_max;
idinor	0:dcf3c92487ca	1311	struct pbuf *q;
idinor	0:dcf3c92487ca	1312	int parse_file_as_options = 0;
idinor	0:dcf3c92487ca	1313	int parse_sname_as_options = 0;
idinor	0:dcf3c92487ca	1314
idinor	0:dcf3c92487ca	1315	/* clear received options */
idinor	0:dcf3c92487ca	1316	dhcp_clear_all_options(dhcp);
idinor	0:dcf3c92487ca	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
idinor	0:dcf3c92487ca	1318	if (p->len < DHCP_SNAME_OFS) {
idinor	0:dcf3c92487ca	1319	return ERR_BUF;
idinor	0:dcf3c92487ca	1320	}
idinor	0:dcf3c92487ca	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
idinor	0:dcf3c92487ca	1322	#if LWIP_DHCP_BOOTP_FILE
idinor	0:dcf3c92487ca	1323	/* clear boot file name */
idinor	0:dcf3c92487ca	1324	dhcp->boot_file_name[0] = 0;
idinor	0:dcf3c92487ca	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
idinor	0:dcf3c92487ca	1326
idinor	0:dcf3c92487ca	1327	/* parse options */
idinor	0:dcf3c92487ca	1328
idinor	0:dcf3c92487ca	1329	/* start with options field */
idinor	0:dcf3c92487ca	1330	options_idx = DHCP_OPTIONS_OFS;
idinor	0:dcf3c92487ca	1331	/* parse options to the end of the received packet */
idinor	0:dcf3c92487ca	1332	options_idx_max = p->tot_len;
idinor	0:dcf3c92487ca	1333	again:
idinor	0:dcf3c92487ca	1334	q = p;
idinor	0:dcf3c92487ca	1335	while((q != NULL) && (options_idx >= q->len)) {
idinor	0:dcf3c92487ca	1336	options_idx -= q->len;
idinor	0:dcf3c92487ca	1337	options_idx_max -= q->len;
idinor	0:dcf3c92487ca	1338	q = q->next;
idinor	0:dcf3c92487ca	1339	}
idinor	0:dcf3c92487ca	1340	if (q == NULL) {
idinor	0:dcf3c92487ca	1341	return ERR_BUF;
idinor	0:dcf3c92487ca	1342	}
idinor	0:dcf3c92487ca	1343	offset = options_idx;
idinor	0:dcf3c92487ca	1344	offset_max = options_idx_max;
idinor	0:dcf3c92487ca	1345	options = (u8_t*)q->payload;
idinor	0:dcf3c92487ca	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
idinor	0:dcf3c92487ca	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
idinor	0:dcf3c92487ca	1348	u8_t op = options[offset];
idinor	0:dcf3c92487ca	1349	u8_t len;
idinor	0:dcf3c92487ca	1350	u8_t decode_len = 0;
idinor	0:dcf3c92487ca	1351	int decode_idx = -1;
idinor	0:dcf3c92487ca	1352	u16_t val_offset = offset + 2;
idinor	0:dcf3c92487ca	1353	/* len byte might be in the next pbuf */
idinor	0:dcf3c92487ca	1354	if (offset + 1 < q->len) {
idinor	0:dcf3c92487ca	1355	len = options[offset + 1];
idinor	0:dcf3c92487ca	1356	} else {
idinor	0:dcf3c92487ca	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
idinor	0:dcf3c92487ca	1358	}
idinor	0:dcf3c92487ca	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
idinor	0:dcf3c92487ca	1360	decode_len = len;
idinor	0:dcf3c92487ca	1361	switch(op) {
idinor	0:dcf3c92487ca	1362	/* case(DHCP_OPTION_END): handled above */
idinor	0:dcf3c92487ca	1363	case(DHCP_OPTION_PAD):
idinor	0:dcf3c92487ca	1364	/* special option: no len encoded */
idinor	0:dcf3c92487ca	1365	decode_len = len = 0;
idinor	0:dcf3c92487ca	1366	/* will be increased below */
idinor	0:dcf3c92487ca	1367	offset--;
idinor	0:dcf3c92487ca	1368	break;
idinor	0:dcf3c92487ca	1369	case(DHCP_OPTION_SUBNET_MASK):
idinor	0:dcf3c92487ca	1370	LWIP_ASSERT("len == 4", len == 4);
idinor	0:dcf3c92487ca	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
idinor	0:dcf3c92487ca	1372	break;
idinor	0:dcf3c92487ca	1373	case(DHCP_OPTION_ROUTER):
idinor	0:dcf3c92487ca	1374	decode_len = 4; /* only copy the first given router */
idinor	0:dcf3c92487ca	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
idinor	0:dcf3c92487ca	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
idinor	0:dcf3c92487ca	1377	break;
idinor	0:dcf3c92487ca	1378	case(DHCP_OPTION_DNS_SERVER):
idinor	0:dcf3c92487ca	1379	/* special case: there might be more than one server */
idinor	0:dcf3c92487ca	1380	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
idinor	0:dcf3c92487ca	1381	/* limit number of DNS servers */
idinor	0:dcf3c92487ca	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
idinor	0:dcf3c92487ca	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
idinor	0:dcf3c92487ca	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
idinor	0:dcf3c92487ca	1385	break;
idinor	0:dcf3c92487ca	1386	case(DHCP_OPTION_LEASE_TIME):
idinor	0:dcf3c92487ca	1387	LWIP_ASSERT("len == 4", len == 4);
idinor	0:dcf3c92487ca	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
idinor	0:dcf3c92487ca	1389	break;
idinor	0:dcf3c92487ca	1390	case(DHCP_OPTION_OVERLOAD):
idinor	0:dcf3c92487ca	1391	LWIP_ASSERT("len == 1", len == 1);
idinor	0:dcf3c92487ca	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
idinor	0:dcf3c92487ca	1393	break;
idinor	0:dcf3c92487ca	1394	case(DHCP_OPTION_MESSAGE_TYPE):
idinor	0:dcf3c92487ca	1395	LWIP_ASSERT("len == 1", len == 1);
idinor	0:dcf3c92487ca	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
idinor	0:dcf3c92487ca	1397	break;
idinor	0:dcf3c92487ca	1398	case(DHCP_OPTION_SERVER_ID):
idinor	0:dcf3c92487ca	1399	LWIP_ASSERT("len == 4", len == 4);
idinor	0:dcf3c92487ca	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
idinor	0:dcf3c92487ca	1401	break;
idinor	0:dcf3c92487ca	1402	case(DHCP_OPTION_T1):
idinor	0:dcf3c92487ca	1403	LWIP_ASSERT("len == 4", len == 4);
idinor	0:dcf3c92487ca	1404	decode_idx = DHCP_OPTION_IDX_T1;
idinor	0:dcf3c92487ca	1405	break;
idinor	0:dcf3c92487ca	1406	case(DHCP_OPTION_T2):
idinor	0:dcf3c92487ca	1407	LWIP_ASSERT("len == 4", len == 4);
idinor	0:dcf3c92487ca	1408	decode_idx = DHCP_OPTION_IDX_T2;
idinor	0:dcf3c92487ca	1409	break;
idinor	0:dcf3c92487ca	1410	default:
idinor	0:dcf3c92487ca	1411	decode_len = 0;
idinor	0:dcf3c92487ca	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
idinor	0:dcf3c92487ca	1413	break;
idinor	0:dcf3c92487ca	1414	}
idinor	0:dcf3c92487ca	1415	offset += len + 2;
idinor	0:dcf3c92487ca	1416	if (decode_len > 0) {
idinor	0:dcf3c92487ca	1417	u32_t value = 0;
idinor	0:dcf3c92487ca	1418	u16_t copy_len;
idinor	0:dcf3c92487ca	1419	decode_next:
idinor	0:dcf3c92487ca	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
idinor	0:dcf3c92487ca	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
idinor	0:dcf3c92487ca	1422	copy_len = LWIP_MIN(decode_len, 4);
idinor	0:dcf3c92487ca	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
idinor	0:dcf3c92487ca	1424	if (decode_len > 4) {
idinor	0:dcf3c92487ca	1425	/* decode more than one u32_t */
idinor	0:dcf3c92487ca	1426	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
idinor	0:dcf3c92487ca	1427	dhcp_got_option(dhcp, decode_idx);
idinor	0:dcf3c92487ca	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
idinor	0:dcf3c92487ca	1429	decode_len -= 4;
idinor	0:dcf3c92487ca	1430	val_offset += 4;
idinor	0:dcf3c92487ca	1431	decode_idx++;
idinor	0:dcf3c92487ca	1432	goto decode_next;
idinor	0:dcf3c92487ca	1433	} else if (decode_len == 4) {
idinor	0:dcf3c92487ca	1434	value = ntohl(value);
idinor	0:dcf3c92487ca	1435	} else {
idinor	0:dcf3c92487ca	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
idinor	0:dcf3c92487ca	1437	value = ((u8_t*)&value)[0];
idinor	0:dcf3c92487ca	1438	}
idinor	0:dcf3c92487ca	1439	dhcp_got_option(dhcp, decode_idx);
idinor	0:dcf3c92487ca	1440	dhcp_set_option_value(dhcp, decode_idx, value);
idinor	0:dcf3c92487ca	1441	}
idinor	0:dcf3c92487ca	1442	if (offset >= q->len) {
idinor	0:dcf3c92487ca	1443	offset -= q->len;
idinor	0:dcf3c92487ca	1444	offset_max -= q->len;
idinor	0:dcf3c92487ca	1445	q = q->next;
idinor	0:dcf3c92487ca	1446	options = (u8_t*)q->payload;
idinor	0:dcf3c92487ca	1447	}
idinor	0:dcf3c92487ca	1448	}
idinor	0:dcf3c92487ca	1449	/* is this an overloaded message? */
idinor	0:dcf3c92487ca	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
idinor	0:dcf3c92487ca	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
idinor	0:dcf3c92487ca	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
idinor	0:dcf3c92487ca	1453	if (overload == DHCP_OVERLOAD_FILE) {
idinor	0:dcf3c92487ca	1454	parse_file_as_options = 1;
idinor	0:dcf3c92487ca	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
idinor	0:dcf3c92487ca	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
idinor	0:dcf3c92487ca	1457	parse_sname_as_options = 1;
idinor	0:dcf3c92487ca	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
idinor	0:dcf3c92487ca	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
idinor	0:dcf3c92487ca	1460	parse_sname_as_options = 1;
idinor	0:dcf3c92487ca	1461	parse_file_as_options = 1;
idinor	0:dcf3c92487ca	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
idinor	0:dcf3c92487ca	1463	} else {
idinor	0:dcf3c92487ca	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
idinor	0:dcf3c92487ca	1465	}
idinor	0:dcf3c92487ca	1466	#if LWIP_DHCP_BOOTP_FILE
idinor	0:dcf3c92487ca	1467	if (!parse_file_as_options) {
idinor	0:dcf3c92487ca	1468	/* only do this for ACK messages */
idinor	0:dcf3c92487ca	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
idinor	0:dcf3c92487ca	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
idinor	0:dcf3c92487ca	1471	/* copy bootp file name, don't care for sname (server hostname) */
idinor	0:dcf3c92487ca	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
idinor	0:dcf3c92487ca	1473	/* make sure the string is really NULL-terminated */
idinor	0:dcf3c92487ca	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
idinor	0:dcf3c92487ca	1475	}
idinor	0:dcf3c92487ca	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
idinor	0:dcf3c92487ca	1477	}
idinor	0:dcf3c92487ca	1478	if (parse_file_as_options) {
idinor	0:dcf3c92487ca	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
idinor	0:dcf3c92487ca	1480	parse_file_as_options = 0;
idinor	0:dcf3c92487ca	1481	options_idx = DHCP_FILE_OFS;
idinor	0:dcf3c92487ca	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
idinor	0:dcf3c92487ca	1483	goto again;
idinor	0:dcf3c92487ca	1484	} else if (parse_sname_as_options) {
idinor	0:dcf3c92487ca	1485	parse_sname_as_options = 0;
idinor	0:dcf3c92487ca	1486	options_idx = DHCP_SNAME_OFS;
idinor	0:dcf3c92487ca	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
idinor	0:dcf3c92487ca	1488	goto again;
idinor	0:dcf3c92487ca	1489	}
idinor	0:dcf3c92487ca	1490	return ERR_OK;
idinor	0:dcf3c92487ca	1491	}
idinor	0:dcf3c92487ca	1492
idinor	0:dcf3c92487ca	1493	/**
idinor	0:dcf3c92487ca	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
idinor	0:dcf3c92487ca	1495	*/
idinor	0:dcf3c92487ca	1496	static void
idinor	0:dcf3c92487ca	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
idinor	0:dcf3c92487ca	1498	{
idinor	0:dcf3c92487ca	1499	struct netif netif = (struct netif )arg;
idinor	0:dcf3c92487ca	1500	struct dhcp *dhcp = netif->dhcp;
idinor	0:dcf3c92487ca	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
idinor	0:dcf3c92487ca	1502	u8_t msg_type;
idinor	0:dcf3c92487ca	1503	u8_t i;
idinor	0:dcf3c92487ca	1504	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
idinor	0:dcf3c92487ca	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
idinor	0:dcf3c92487ca	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
idinor	0:dcf3c92487ca	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
idinor	0:dcf3c92487ca	1508	/* prevent warnings about unused arguments */
idinor	0:dcf3c92487ca	1509	LWIP_UNUSED_ARG(pcb);
idinor	0:dcf3c92487ca	1510	LWIP_UNUSED_ARG(addr);
idinor	0:dcf3c92487ca	1511	LWIP_UNUSED_ARG(port);
idinor	0:dcf3c92487ca	1512
idinor	0:dcf3c92487ca	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
idinor	0:dcf3c92487ca	1514
idinor	0:dcf3c92487ca	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
idinor	0:dcf3c92487ca	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
idinor	0:dcf3c92487ca	1517	goto free_pbuf_and_return;
idinor	0:dcf3c92487ca	1518	}
idinor	0:dcf3c92487ca	1519
idinor	0:dcf3c92487ca	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
idinor	0:dcf3c92487ca	1521	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
idinor	0:dcf3c92487ca	1522	goto free_pbuf_and_return;
idinor	0:dcf3c92487ca	1523	}
idinor	0:dcf3c92487ca	1524	/* iterate through hardware address and match against DHCP message */
idinor	0:dcf3c92487ca	1525	for (i = 0; i < netif->hwaddr_len; i++) {
idinor	0:dcf3c92487ca	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
idinor	0:dcf3c92487ca	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
idinor	0:dcf3c92487ca	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
idinor	0:dcf3c92487ca	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
idinor	0:dcf3c92487ca	1530	goto free_pbuf_and_return;
idinor	0:dcf3c92487ca	1531	}
idinor	0:dcf3c92487ca	1532	}
idinor	0:dcf3c92487ca	1533	/* match transaction ID against what we expected */
idinor	0:dcf3c92487ca	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
idinor	0:dcf3c92487ca	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
idinor	0:dcf3c92487ca	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
idinor	0:dcf3c92487ca	1537	goto free_pbuf_and_return;
idinor	0:dcf3c92487ca	1538	}
idinor	0:dcf3c92487ca	1539	/* option fields could be unfold? */
idinor	0:dcf3c92487ca	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
idinor	0:dcf3c92487ca	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	1542	("problem unfolding DHCP message - too short on memory?\n"));
idinor	0:dcf3c92487ca	1543	goto free_pbuf_and_return;
idinor	0:dcf3c92487ca	1544	}
idinor	0:dcf3c92487ca	1545
idinor	0:dcf3c92487ca	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
idinor	0:dcf3c92487ca	1547	/* obtain pointer to DHCP message type */
idinor	0:dcf3c92487ca	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
idinor	0:dcf3c92487ca	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
idinor	0:dcf3c92487ca	1550	goto free_pbuf_and_return;
idinor	0:dcf3c92487ca	1551	}
idinor	0:dcf3c92487ca	1552
idinor	0:dcf3c92487ca	1553	/* read DHCP message type */
idinor	0:dcf3c92487ca	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
idinor	0:dcf3c92487ca	1555	/* message type is DHCP ACK? */
idinor	0:dcf3c92487ca	1556	if (msg_type == DHCP_ACK) {
idinor	0:dcf3c92487ca	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
idinor	0:dcf3c92487ca	1558	/* in requesting state? */
idinor	0:dcf3c92487ca	1559	if (dhcp->state == DHCP_REQUESTING) {
idinor	0:dcf3c92487ca	1560	dhcp_handle_ack(netif);
idinor	0:dcf3c92487ca	1561	#if DHCP_DOES_ARP_CHECK
idinor	0:dcf3c92487ca	1562	/* check if the acknowledged lease address is already in use */
idinor	0:dcf3c92487ca	1563	dhcp_check(netif);
idinor	0:dcf3c92487ca	1564	#else
idinor	0:dcf3c92487ca	1565	/* bind interface to the acknowledged lease address */
idinor	0:dcf3c92487ca	1566	dhcp_bind(netif);
idinor	0:dcf3c92487ca	1567	#endif
idinor	0:dcf3c92487ca	1568	}
idinor	0:dcf3c92487ca	1569	/* already bound to the given lease address? */
idinor	0:dcf3c92487ca	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
idinor	0:dcf3c92487ca	1571	dhcp_bind(netif);
idinor	0:dcf3c92487ca	1572	}
idinor	0:dcf3c92487ca	1573	}
idinor	0:dcf3c92487ca	1574	/* received a DHCP_NAK in appropriate state? */
idinor	0:dcf3c92487ca	1575	else if ((msg_type == DHCP_NAK) &&
idinor	0:dcf3c92487ca	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
idinor	0:dcf3c92487ca	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
idinor	0:dcf3c92487ca	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
idinor	0:dcf3c92487ca	1579	dhcp_handle_nak(netif);
idinor	0:dcf3c92487ca	1580	}
idinor	0:dcf3c92487ca	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
idinor	0:dcf3c92487ca	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
idinor	0:dcf3c92487ca	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
idinor	0:dcf3c92487ca	1584	dhcp->request_timeout = 0;
idinor	0:dcf3c92487ca	1585	/* remember offered lease */
idinor	0:dcf3c92487ca	1586	dhcp_handle_offer(netif);
idinor	0:dcf3c92487ca	1587	}
idinor	0:dcf3c92487ca	1588	free_pbuf_and_return:
idinor	0:dcf3c92487ca	1589	dhcp->msg_in = NULL;
idinor	0:dcf3c92487ca	1590	pbuf_free(p);
idinor	0:dcf3c92487ca	1591	}
idinor	0:dcf3c92487ca	1592
idinor	0:dcf3c92487ca	1593	/**
idinor	0:dcf3c92487ca	1594	* Create a DHCP request, fill in common headers
idinor	0:dcf3c92487ca	1595	*
idinor	0:dcf3c92487ca	1596	* @param netif the netif under DHCP control
idinor	0:dcf3c92487ca	1597	* @param dhcp dhcp control struct
idinor	0:dcf3c92487ca	1598	* @param message_type message type of the request
idinor	0:dcf3c92487ca	1599	*/
idinor	0:dcf3c92487ca	1600	static err_t
idinor	0:dcf3c92487ca	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
idinor	0:dcf3c92487ca	1602	{
idinor	0:dcf3c92487ca	1603	u16_t i;
idinor	0:dcf3c92487ca	1604	#ifndef DHCP_GLOBAL_XID
idinor	0:dcf3c92487ca	1605	/** default global transaction identifier starting value (easy to match
idinor	0:dcf3c92487ca	1606	* with a packet analyser). We simply increment for each new request.
idinor	0:dcf3c92487ca	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
idinor	0:dcf3c92487ca	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
idinor	0:dcf3c92487ca	1609	static u32_t xid = 0xABCD0000;
idinor	0:dcf3c92487ca	1610	#else
idinor	0:dcf3c92487ca	1611	static u32_t xid;
idinor	0:dcf3c92487ca	1612	static u8_t xid_initialised = 0;
idinor	0:dcf3c92487ca	1613	if (!xid_initialised) {
idinor	0:dcf3c92487ca	1614	xid = DHCP_GLOBAL_XID;
idinor	0:dcf3c92487ca	1615	xid_initialised = !xid_initialised;
idinor	0:dcf3c92487ca	1616	}
idinor	0:dcf3c92487ca	1617	#endif
idinor	0:dcf3c92487ca	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
idinor	0:dcf3c92487ca	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
idinor	0:dcf3c92487ca	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
idinor	0:dcf3c92487ca	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
idinor	0:dcf3c92487ca	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
idinor	0:dcf3c92487ca	1623	if (dhcp->p_out == NULL) {
idinor	0:dcf3c92487ca	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
idinor	0:dcf3c92487ca	1626	return ERR_MEM;
idinor	0:dcf3c92487ca	1627	}
idinor	0:dcf3c92487ca	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
idinor	0:dcf3c92487ca	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
idinor	0:dcf3c92487ca	1630
idinor	0:dcf3c92487ca	1631	/* reuse transaction identifier in retransmissions */
idinor	0:dcf3c92487ca	1632	if (dhcp->tries == 0) {
idinor	0:dcf3c92487ca	1633	xid++;
idinor	0:dcf3c92487ca	1634	}
idinor	0:dcf3c92487ca	1635	dhcp->xid = xid;
idinor	0:dcf3c92487ca	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
idinor	0:dcf3c92487ca	1637	("transaction id xid(%"X32_F")\n", xid));
idinor	0:dcf3c92487ca	1638
idinor	0:dcf3c92487ca	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
idinor	0:dcf3c92487ca	1640
idinor	0:dcf3c92487ca	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
idinor	0:dcf3c92487ca	1642	/* TODO: make link layer independent */
idinor	0:dcf3c92487ca	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
idinor	0:dcf3c92487ca	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
idinor	0:dcf3c92487ca	1645	dhcp->msg_out->hops = 0;
idinor	0:dcf3c92487ca	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
idinor	0:dcf3c92487ca	1647	dhcp->msg_out->secs = 0;
idinor	0:dcf3c92487ca	1648	/* we don't need the broadcast flag since we can receive unicast traffic
idinor	0:dcf3c92487ca	1649	before being fully configured! */
idinor	0:dcf3c92487ca	1650	dhcp->msg_out->flags = 0;
idinor	0:dcf3c92487ca	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
idinor	0:dcf3c92487ca	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
idinor	0:dcf3c92487ca	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
idinor	0:dcf3c92487ca	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
idinor	0:dcf3c92487ca	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
idinor	0:dcf3c92487ca	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
idinor	0:dcf3c92487ca	1657	}
idinor	0:dcf3c92487ca	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
idinor	0:dcf3c92487ca	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
idinor	0:dcf3c92487ca	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
idinor	0:dcf3c92487ca	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
idinor	0:dcf3c92487ca	1662	/* copy netif hardware address, pad with zeroes */
idinor	0:dcf3c92487ca	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
idinor	0:dcf3c92487ca	1664	}
idinor	0:dcf3c92487ca	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
idinor	0:dcf3c92487ca	1666	dhcp->msg_out->sname[i] = 0;
idinor	0:dcf3c92487ca	1667	}
idinor	0:dcf3c92487ca	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
idinor	0:dcf3c92487ca	1669	dhcp->msg_out->file[i] = 0;
idinor	0:dcf3c92487ca	1670	}
idinor	0:dcf3c92487ca	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
idinor	0:dcf3c92487ca	1672	dhcp->options_out_len = 0;
idinor	0:dcf3c92487ca	1673	/* fill options field with an incrementing array (for debugging purposes) */
idinor	0:dcf3c92487ca	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
idinor	0:dcf3c92487ca	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
idinor	0:dcf3c92487ca	1676	}
idinor	0:dcf3c92487ca	1677	/* Add option MESSAGE_TYPE */
idinor	0:dcf3c92487ca	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
idinor	0:dcf3c92487ca	1679	dhcp_option_byte(dhcp, message_type);
idinor	0:dcf3c92487ca	1680	return ERR_OK;
idinor	0:dcf3c92487ca	1681	}
idinor	0:dcf3c92487ca	1682
idinor	0:dcf3c92487ca	1683	/**
idinor	0:dcf3c92487ca	1684	* Free previously allocated memory used to send a DHCP request.
idinor	0:dcf3c92487ca	1685	*
idinor	0:dcf3c92487ca	1686	* @param dhcp the dhcp struct to free the request from
idinor	0:dcf3c92487ca	1687	*/
idinor	0:dcf3c92487ca	1688	static void
idinor	0:dcf3c92487ca	1689	dhcp_delete_msg(struct dhcp *dhcp)
idinor	0:dcf3c92487ca	1690	{
idinor	0:dcf3c92487ca	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
idinor	0:dcf3c92487ca	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
idinor	0:dcf3c92487ca	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
idinor	0:dcf3c92487ca	1694	if (dhcp->p_out != NULL) {
idinor	0:dcf3c92487ca	1695	pbuf_free(dhcp->p_out);
idinor	0:dcf3c92487ca	1696	}
idinor	0:dcf3c92487ca	1697	dhcp->p_out = NULL;
idinor	0:dcf3c92487ca	1698	dhcp->msg_out = NULL;
idinor	0:dcf3c92487ca	1699	}
idinor	0:dcf3c92487ca	1700
idinor	0:dcf3c92487ca	1701	/**
idinor	0:dcf3c92487ca	1702	* Add a DHCP message trailer
idinor	0:dcf3c92487ca	1703	*
idinor	0:dcf3c92487ca	1704	* Adds the END option to the DHCP message, and if
idinor	0:dcf3c92487ca	1705	* necessary, up to three padding bytes.
idinor	0:dcf3c92487ca	1706	*
idinor	0:dcf3c92487ca	1707	* @param dhcp DHCP state structure
idinor	0:dcf3c92487ca	1708	*/
idinor	0:dcf3c92487ca	1709	static void
idinor	0:dcf3c92487ca	1710	dhcp_option_trailer(struct dhcp *dhcp)
idinor	0:dcf3c92487ca	1711	{
idinor	0:dcf3c92487ca	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
idinor	0:dcf3c92487ca	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
idinor	0:dcf3c92487ca	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
idinor	0:dcf3c92487ca	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
idinor	0:dcf3c92487ca	1716	/* packet is too small, or not 4 byte aligned? */
idinor	0:dcf3c92487ca	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
idinor	0:dcf3c92487ca	1718	/* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
idinor	0:dcf3c92487ca	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
idinor	0:dcf3c92487ca	1720	/* add a fill/padding byte */
idinor	0:dcf3c92487ca	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
idinor	0:dcf3c92487ca	1722	}
idinor	0:dcf3c92487ca	1723	}
idinor	0:dcf3c92487ca	1724
idinor	0:dcf3c92487ca	1725	#endif /* LWIP_DHCP */

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Type:	Library
Created:	20 Jul 2011
Imports:	35
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	1

lwip/core/dhcp.c@0:dcf3c92487ca, 2011-07-20 (annotated)

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