TCPSpeedTest - I have a problem getting this to work. Server onl…

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Jesper Taxbøl / Mbed 2 deprecated TCPSpeedTest

I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/core/dhcp.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* Dynamic Host Configuration Protocol client
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	*/
tax	0:66300c77c6e9	6
tax	0:66300c77c6e9	7	/*
tax	0:66300c77c6e9	8	*
tax	0:66300c77c6e9	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
tax	0:66300c77c6e9	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
tax	0:66300c77c6e9	11	* All rights reserved.
tax	0:66300c77c6e9	12	*
tax	0:66300c77c6e9	13	* Redistribution and use in source and binary forms, with or without modification,
tax	0:66300c77c6e9	14	* are permitted provided that the following conditions are met:
tax	0:66300c77c6e9	15	*
tax	0:66300c77c6e9	16	* 1. Redistributions of source code must retain the above copyright notice,
tax	0:66300c77c6e9	17	* this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
tax	0:66300c77c6e9	19	* this list of conditions and the following disclaimer in the documentation
tax	0:66300c77c6e9	20	* and/or other materials provided with the distribution.
tax	0:66300c77c6e9	21	* 3. The name of the author may not be used to endorse or promote products
tax	0:66300c77c6e9	22	* derived from this software without specific prior written permission.
tax	0:66300c77c6e9	23	*
tax	0:66300c77c6e9	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
tax	0:66300c77c6e9	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
tax	0:66300c77c6e9	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
tax	0:66300c77c6e9	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
tax	0:66300c77c6e9	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
tax	0:66300c77c6e9	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
tax	0:66300c77c6e9	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
tax	0:66300c77c6e9	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
tax	0:66300c77c6e9	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
tax	0:66300c77c6e9	33	* OF SUCH DAMAGE.
tax	0:66300c77c6e9	34	*
tax	0:66300c77c6e9	35	* This file is a contribution to the lwIP TCP/IP stack.
tax	0:66300c77c6e9	36	* The Swedish Institute of Computer Science and Adam Dunkels
tax	0:66300c77c6e9	37	* are specifically granted permission to redistribute this
tax	0:66300c77c6e9	38	* source code.
tax	0:66300c77c6e9	39	*
tax	0:66300c77c6e9	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
tax	0:66300c77c6e9	41	*
tax	0:66300c77c6e9	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
tax	0:66300c77c6e9	43	* with RFC 2131 and RFC 2132.
tax	0:66300c77c6e9	44	*
tax	0:66300c77c6e9	45	* TODO:
tax	0:66300c77c6e9	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
tax	0:66300c77c6e9	47	*
tax	0:66300c77c6e9	48	* Please coordinate changes and requests with Leon Woestenberg
tax	0:66300c77c6e9	49	* <leon.woestenberg@gmx.net>
tax	0:66300c77c6e9	50	*
tax	0:66300c77c6e9	51	* Integration with your code:
tax	0:66300c77c6e9	52	*
tax	0:66300c77c6e9	53	* In lwip/dhcp.h
tax	0:66300c77c6e9	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
tax	0:66300c77c6e9	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
tax	0:66300c77c6e9	56	*
tax	0:66300c77c6e9	57	* Then have your application call dhcp_coarse_tmr() and
tax	0:66300c77c6e9	58	* dhcp_fine_tmr() on the defined intervals.
tax	0:66300c77c6e9	59	*
tax	0:66300c77c6e9	60	* dhcp_start(struct netif *netif);
tax	0:66300c77c6e9	61	* starts a DHCP client instance which configures the interface by
tax	0:66300c77c6e9	62	* obtaining an IP address lease and maintaining it.
tax	0:66300c77c6e9	63	*
tax	0:66300c77c6e9	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
tax	0:66300c77c6e9	65	* to remove the DHCP client.
tax	0:66300c77c6e9	66	*
tax	0:66300c77c6e9	67	*/
tax	0:66300c77c6e9	68
tax	0:66300c77c6e9	69	#include "lwip/opt.h"
tax	0:66300c77c6e9	70
tax	0:66300c77c6e9	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
tax	0:66300c77c6e9	72
tax	0:66300c77c6e9	73	#include "lwip/stats.h"
tax	0:66300c77c6e9	74	#include "lwip/mem.h"
tax	0:66300c77c6e9	75	#include "lwip/udp.h"
tax	0:66300c77c6e9	76	#include "lwip/ip_addr.h"
tax	0:66300c77c6e9	77	#include "lwip/netif.h"
tax	0:66300c77c6e9	78	#include "lwip/def.h"
tax	0:66300c77c6e9	79	#include "lwip/sys.h"
tax	0:66300c77c6e9	80	#include "lwip/dhcp.h"
tax	0:66300c77c6e9	81	#include "lwip/autoip.h"
tax	0:66300c77c6e9	82	#include "lwip/dns.h"
tax	0:66300c77c6e9	83	#include "netif/etharp.h"
tax	0:66300c77c6e9	84
tax	0:66300c77c6e9	85	#include <string.h>
tax	0:66300c77c6e9	86
tax	0:66300c77c6e9	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
tax	0:66300c77c6e9	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
tax	0:66300c77c6e9	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
tax	0:66300c77c6e9	90	* #define DHCP_GLOBAL_XID rand()
tax	0:66300c77c6e9	91	*/
tax	0:66300c77c6e9	92	#ifdef DHCP_GLOBAL_XID_HEADER
tax	0:66300c77c6e9	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
tax	0:66300c77c6e9	94	#endif
tax	0:66300c77c6e9	95
tax	0:66300c77c6e9	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
tax	0:66300c77c6e9	97	* MTU is checked to be big enough in dhcp_start */
tax	0:66300c77c6e9	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
tax	0:66300c77c6e9	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
tax	0:66300c77c6e9	100	/** Minimum length for reply before packet is parsed */
tax	0:66300c77c6e9	101	#define DHCP_MIN_REPLY_LEN 44
tax	0:66300c77c6e9	102
tax	0:66300c77c6e9	103	#define REBOOT_TRIES 2
tax	0:66300c77c6e9	104
tax	0:66300c77c6e9	105	/** Option handling: options are parsed in dhcp_parse_reply
tax	0:66300c77c6e9	106	* and saved in an array where other functions can load them from.
tax	0:66300c77c6e9	107	* This might be moved into the struct dhcp (not necessarily since
tax	0:66300c77c6e9	108	* lwIP is single-threaded and the array is only used while in recv
tax	0:66300c77c6e9	109	* callback). */
tax	0:66300c77c6e9	110	#define DHCP_OPTION_IDX_OVERLOAD 0
tax	0:66300c77c6e9	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
tax	0:66300c77c6e9	112	#define DHCP_OPTION_IDX_SERVER_ID 2
tax	0:66300c77c6e9	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
tax	0:66300c77c6e9	114	#define DHCP_OPTION_IDX_T1 4
tax	0:66300c77c6e9	115	#define DHCP_OPTION_IDX_T2 5
tax	0:66300c77c6e9	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
tax	0:66300c77c6e9	117	#define DHCP_OPTION_IDX_ROUTER 7
tax	0:66300c77c6e9	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
tax	0:66300c77c6e9	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
tax	0:66300c77c6e9	120
tax	0:66300c77c6e9	121	/** Holds the decoded option values, only valid while in dhcp_recv.
tax	0:66300c77c6e9	122	@todo: move this into struct dhcp? */
tax	0:66300c77c6e9	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
tax	0:66300c77c6e9	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
tax	0:66300c77c6e9	125	only valid while in dhcp_recv.
tax	0:66300c77c6e9	126	@todo: move this into struct dhcp? */
tax	0:66300c77c6e9	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
tax	0:66300c77c6e9	128
tax	0:66300c77c6e9	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
tax	0:66300c77c6e9	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
tax	0:66300c77c6e9	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
tax	0:66300c77c6e9	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
tax	0:66300c77c6e9	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
tax	0:66300c77c6e9	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
tax	0:66300c77c6e9	135
tax	0:66300c77c6e9	136
tax	0:66300c77c6e9	137	/* DHCP client state machine functions */
tax	0:66300c77c6e9	138	static err_t dhcp_discover(struct netif *netif);
tax	0:66300c77c6e9	139	static err_t dhcp_select(struct netif *netif);
tax	0:66300c77c6e9	140	static void dhcp_bind(struct netif *netif);
tax	0:66300c77c6e9	141	#if DHCP_DOES_ARP_CHECK
tax	0:66300c77c6e9	142	static err_t dhcp_decline(struct netif *netif);
tax	0:66300c77c6e9	143	#endif /* DHCP_DOES_ARP_CHECK */
tax	0:66300c77c6e9	144	static err_t dhcp_rebind(struct netif *netif);
tax	0:66300c77c6e9	145	static err_t dhcp_reboot(struct netif *netif);
tax	0:66300c77c6e9	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
tax	0:66300c77c6e9	147
tax	0:66300c77c6e9	148	/* receive, unfold, parse and free incoming messages */
tax	0:66300c77c6e9	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
tax	0:66300c77c6e9	150
tax	0:66300c77c6e9	151	/* set the DHCP timers */
tax	0:66300c77c6e9	152	static void dhcp_timeout(struct netif *netif);
tax	0:66300c77c6e9	153	static void dhcp_t1_timeout(struct netif *netif);
tax	0:66300c77c6e9	154	static void dhcp_t2_timeout(struct netif *netif);
tax	0:66300c77c6e9	155
tax	0:66300c77c6e9	156	/* build outgoing messages */
tax	0:66300c77c6e9	157	/* create a DHCP message, fill in common headers */
tax	0:66300c77c6e9	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
tax	0:66300c77c6e9	159	/* free a DHCP request */
tax	0:66300c77c6e9	160	static void dhcp_delete_msg(struct dhcp *dhcp);
tax	0:66300c77c6e9	161	/* add a DHCP option (type, then length in bytes) */
tax	0:66300c77c6e9	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
tax	0:66300c77c6e9	163	/* add option values */
tax	0:66300c77c6e9	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
tax	0:66300c77c6e9	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
tax	0:66300c77c6e9	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
tax	0:66300c77c6e9	167	/* always add the DHCP options trailer to end and pad */
tax	0:66300c77c6e9	168	static void dhcp_option_trailer(struct dhcp *dhcp);
tax	0:66300c77c6e9	169
tax	0:66300c77c6e9	170	/**
tax	0:66300c77c6e9	171	* Back-off the DHCP client (because of a received NAK response).
tax	0:66300c77c6e9	172	*
tax	0:66300c77c6e9	173	* Back-off the DHCP client because of a received NAK. Receiving a
tax	0:66300c77c6e9	174	* NAK means the client asked for something non-sensible, for
tax	0:66300c77c6e9	175	* example when it tries to renew a lease obtained on another network.
tax	0:66300c77c6e9	176	*
tax	0:66300c77c6e9	177	* We clear any existing set IP address and restart DHCP negotiation
tax	0:66300c77c6e9	178	* afresh (as per RFC2131 3.2.3).
tax	0:66300c77c6e9	179	*
tax	0:66300c77c6e9	180	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	181	*/
tax	0:66300c77c6e9	182	static void
tax	0:66300c77c6e9	183	dhcp_handle_nak(struct netif *netif)
tax	0:66300c77c6e9	184	{
tax	0:66300c77c6e9	185	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
tax	0:66300c77c6e9	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
tax	0:66300c77c6e9	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
tax	0:66300c77c6e9	189	netif_set_down(netif);
tax	0:66300c77c6e9	190	/* remove IP address from interface */
tax	0:66300c77c6e9	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
tax	0:66300c77c6e9	192	netif_set_gw(netif, IP_ADDR_ANY);
tax	0:66300c77c6e9	193	netif_set_netmask(netif, IP_ADDR_ANY);
tax	0:66300c77c6e9	194	/* Change to a defined state */
tax	0:66300c77c6e9	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
tax	0:66300c77c6e9	196	/* We can immediately restart discovery */
tax	0:66300c77c6e9	197	dhcp_discover(netif);
tax	0:66300c77c6e9	198	}
tax	0:66300c77c6e9	199
tax	0:66300c77c6e9	200	#if DHCP_DOES_ARP_CHECK
tax	0:66300c77c6e9	201	/**
tax	0:66300c77c6e9	202	* Checks if the offered IP address is already in use.
tax	0:66300c77c6e9	203	*
tax	0:66300c77c6e9	204	* It does so by sending an ARP request for the offered address and
tax	0:66300c77c6e9	205	* entering CHECKING state. If no ARP reply is received within a small
tax	0:66300c77c6e9	206	* interval, the address is assumed to be free for use by us.
tax	0:66300c77c6e9	207	*
tax	0:66300c77c6e9	208	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	209	*/
tax	0:66300c77c6e9	210	static void
tax	0:66300c77c6e9	211	dhcp_check(struct netif *netif)
tax	0:66300c77c6e9	212	{
tax	0:66300c77c6e9	213	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	214	err_t result;
tax	0:66300c77c6e9	215	u16_t msecs;
tax	0:66300c77c6e9	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
tax	0:66300c77c6e9	217	(s16_t)netif->name[1]));
tax	0:66300c77c6e9	218	dhcp_set_state(dhcp, DHCP_CHECKING);
tax	0:66300c77c6e9	219	/* create an ARP query for the offered IP address, expecting that no host
tax	0:66300c77c6e9	220	responds, as the IP address should not be in use. */
tax	0:66300c77c6e9	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
tax	0:66300c77c6e9	222	if (result != ERR_OK) {
tax	0:66300c77c6e9	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
tax	0:66300c77c6e9	224	}
tax	0:66300c77c6e9	225	dhcp->tries++;
tax	0:66300c77c6e9	226	msecs = 500;
tax	0:66300c77c6e9	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	229	}
tax	0:66300c77c6e9	230	#endif /* DHCP_DOES_ARP_CHECK */
tax	0:66300c77c6e9	231
tax	0:66300c77c6e9	232	/**
tax	0:66300c77c6e9	233	* Remember the configuration offered by a DHCP server.
tax	0:66300c77c6e9	234	*
tax	0:66300c77c6e9	235	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	236	*/
tax	0:66300c77c6e9	237	static void
tax	0:66300c77c6e9	238	dhcp_handle_offer(struct netif *netif)
tax	0:66300c77c6e9	239	{
tax	0:66300c77c6e9	240	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
tax	0:66300c77c6e9	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
tax	0:66300c77c6e9	243	/* obtain the server address */
tax	0:66300c77c6e9	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
tax	0:66300c77c6e9	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
tax	0:66300c77c6e9	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
tax	0:66300c77c6e9	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
tax	0:66300c77c6e9	248	/* remember offered address */
tax	0:66300c77c6e9	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
tax	0:66300c77c6e9	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
tax	0:66300c77c6e9	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
tax	0:66300c77c6e9	252
tax	0:66300c77c6e9	253	dhcp_select(netif);
tax	0:66300c77c6e9	254	} else {
tax	0:66300c77c6e9	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
tax	0:66300c77c6e9	257	}
tax	0:66300c77c6e9	258	}
tax	0:66300c77c6e9	259
tax	0:66300c77c6e9	260	/**
tax	0:66300c77c6e9	261	* Select a DHCP server offer out of all offers.
tax	0:66300c77c6e9	262	*
tax	0:66300c77c6e9	263	* Simply select the first offer received.
tax	0:66300c77c6e9	264	*
tax	0:66300c77c6e9	265	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	266	* @return lwIP specific error (see error.h)
tax	0:66300c77c6e9	267	*/
tax	0:66300c77c6e9	268	static err_t
tax	0:66300c77c6e9	269	dhcp_select(struct netif *netif)
tax	0:66300c77c6e9	270	{
tax	0:66300c77c6e9	271	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	272	err_t result;
tax	0:66300c77c6e9	273	u16_t msecs;
tax	0:66300c77c6e9	274
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
tax	0:66300c77c6e9	277
tax	0:66300c77c6e9	278	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
tax	0:66300c77c6e9	280	if (result == ERR_OK) {
tax	0:66300c77c6e9	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
tax	0:66300c77c6e9	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
tax	0:66300c77c6e9	283
tax	0:66300c77c6e9	284	/* MUST request the offered IP address */
tax	0:66300c77c6e9	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
tax	0:66300c77c6e9	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
tax	0:66300c77c6e9	287
tax	0:66300c77c6e9	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
tax	0:66300c77c6e9	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
tax	0:66300c77c6e9	290
tax	0:66300c77c6e9	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
tax	0:66300c77c6e9	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
tax	0:66300c77c6e9	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
tax	0:66300c77c6e9	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
tax	0:66300c77c6e9	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
tax	0:66300c77c6e9	296
tax	0:66300c77c6e9	297	#if LWIP_NETIF_HOSTNAME
tax	0:66300c77c6e9	298	if (netif->hostname != NULL) {
tax	0:66300c77c6e9	299	const char p = (const char)netif->hostname;
tax	0:66300c77c6e9	300	u8_t namelen = (u8_t)strlen(p);
tax	0:66300c77c6e9	301	if (namelen > 0) {
tax	0:66300c77c6e9	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
tax	0:66300c77c6e9	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
tax	0:66300c77c6e9	304	while (*p) {
tax	0:66300c77c6e9	305	dhcp_option_byte(dhcp, *p++);
tax	0:66300c77c6e9	306	}
tax	0:66300c77c6e9	307	}
tax	0:66300c77c6e9	308	}
tax	0:66300c77c6e9	309	#endif /* LWIP_NETIF_HOSTNAME */
tax	0:66300c77c6e9	310
tax	0:66300c77c6e9	311	dhcp_option_trailer(dhcp);
tax	0:66300c77c6e9	312	/* shrink the pbuf to the actual content length */
tax	0:66300c77c6e9	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
tax	0:66300c77c6e9	314
tax	0:66300c77c6e9	315	/* send broadcast to any DHCP server */
tax	0:66300c77c6e9	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	317	dhcp_delete_msg(dhcp);
tax	0:66300c77c6e9	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
tax	0:66300c77c6e9	319	} else {
tax	0:66300c77c6e9	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	321	}
tax	0:66300c77c6e9	322	dhcp->tries++;
tax	0:66300c77c6e9	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
tax	0:66300c77c6e9	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	326	return result;
tax	0:66300c77c6e9	327	}
tax	0:66300c77c6e9	328
tax	0:66300c77c6e9	329	/**
tax	0:66300c77c6e9	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
tax	0:66300c77c6e9	331	*/
tax	0:66300c77c6e9	332	void
tax	0:66300c77c6e9	333	dhcp_coarse_tmr()
tax	0:66300c77c6e9	334	{
tax	0:66300c77c6e9	335	struct netif *netif = netif_list;
tax	0:66300c77c6e9	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
tax	0:66300c77c6e9	337	/* iterate through all network interfaces */
tax	0:66300c77c6e9	338	while (netif != NULL) {
tax	0:66300c77c6e9	339	/* only act on DHCP configured interfaces */
tax	0:66300c77c6e9	340	if (netif->dhcp != NULL) {
tax	0:66300c77c6e9	341	/* timer is active (non zero), and triggers (zeroes) now? */
tax	0:66300c77c6e9	342	if (netif->dhcp->t2_timeout-- == 1) {
tax	0:66300c77c6e9	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
tax	0:66300c77c6e9	344	/* this clients' rebind timeout triggered */
tax	0:66300c77c6e9	345	dhcp_t2_timeout(netif);
tax	0:66300c77c6e9	346	/* timer is active (non zero), and triggers (zeroes) now */
tax	0:66300c77c6e9	347	} else if (netif->dhcp->t1_timeout-- == 1) {
tax	0:66300c77c6e9	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
tax	0:66300c77c6e9	349	/* this clients' renewal timeout triggered */
tax	0:66300c77c6e9	350	dhcp_t1_timeout(netif);
tax	0:66300c77c6e9	351	}
tax	0:66300c77c6e9	352	}
tax	0:66300c77c6e9	353	/* proceed to next netif */
tax	0:66300c77c6e9	354	netif = netif->next;
tax	0:66300c77c6e9	355	}
tax	0:66300c77c6e9	356	}
tax	0:66300c77c6e9	357
tax	0:66300c77c6e9	358	/**
tax	0:66300c77c6e9	359	* DHCP transaction timeout handling
tax	0:66300c77c6e9	360	*
tax	0:66300c77c6e9	361	* A DHCP server is expected to respond within a short period of time.
tax	0:66300c77c6e9	362	* This timer checks whether an outstanding DHCP request is timed out.
tax	0:66300c77c6e9	363	*/
tax	0:66300c77c6e9	364	void
tax	0:66300c77c6e9	365	dhcp_fine_tmr()
tax	0:66300c77c6e9	366	{
tax	0:66300c77c6e9	367	struct netif *netif = netif_list;
tax	0:66300c77c6e9	368	/* loop through netif's */
tax	0:66300c77c6e9	369	while (netif != NULL) {
tax	0:66300c77c6e9	370	/* only act on DHCP configured interfaces */
tax	0:66300c77c6e9	371	if (netif->dhcp != NULL) {
tax	0:66300c77c6e9	372	/* timer is active (non zero), and is about to trigger now */
tax	0:66300c77c6e9	373	if (netif->dhcp->request_timeout > 1) {
tax	0:66300c77c6e9	374	netif->dhcp->request_timeout--;
tax	0:66300c77c6e9	375	}
tax	0:66300c77c6e9	376	else if (netif->dhcp->request_timeout == 1) {
tax	0:66300c77c6e9	377	netif->dhcp->request_timeout--;
tax	0:66300c77c6e9	378	/* { netif->dhcp->request_timeout == 0 } */
tax	0:66300c77c6e9	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
tax	0:66300c77c6e9	380	/* this client's request timeout triggered */
tax	0:66300c77c6e9	381	dhcp_timeout(netif);
tax	0:66300c77c6e9	382	}
tax	0:66300c77c6e9	383	}
tax	0:66300c77c6e9	384	/* proceed to next network interface */
tax	0:66300c77c6e9	385	netif = netif->next;
tax	0:66300c77c6e9	386	}
tax	0:66300c77c6e9	387	}
tax	0:66300c77c6e9	388
tax	0:66300c77c6e9	389	/**
tax	0:66300c77c6e9	390	* A DHCP negotiation transaction, or ARP request, has timed out.
tax	0:66300c77c6e9	391	*
tax	0:66300c77c6e9	392	* The timer that was started with the DHCP or ARP request has
tax	0:66300c77c6e9	393	* timed out, indicating no response was received in time.
tax	0:66300c77c6e9	394	*
tax	0:66300c77c6e9	395	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	396	*/
tax	0:66300c77c6e9	397	static void
tax	0:66300c77c6e9	398	dhcp_timeout(struct netif *netif)
tax	0:66300c77c6e9	399	{
tax	0:66300c77c6e9	400	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
tax	0:66300c77c6e9	402	/* back-off period has passed, or server selection timed out */
tax	0:66300c77c6e9	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
tax	0:66300c77c6e9	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
tax	0:66300c77c6e9	405	dhcp_discover(netif);
tax	0:66300c77c6e9	406	/* receiving the requested lease timed out */
tax	0:66300c77c6e9	407	} else if (dhcp->state == DHCP_REQUESTING) {
tax	0:66300c77c6e9	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
tax	0:66300c77c6e9	409	if (dhcp->tries <= 5) {
tax	0:66300c77c6e9	410	dhcp_select(netif);
tax	0:66300c77c6e9	411	} else {
tax	0:66300c77c6e9	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
tax	0:66300c77c6e9	413	dhcp_release(netif);
tax	0:66300c77c6e9	414	dhcp_discover(netif);
tax	0:66300c77c6e9	415	}
tax	0:66300c77c6e9	416	#if DHCP_DOES_ARP_CHECK
tax	0:66300c77c6e9	417	/* received no ARP reply for the offered address (which is good) */
tax	0:66300c77c6e9	418	} else if (dhcp->state == DHCP_CHECKING) {
tax	0:66300c77c6e9	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
tax	0:66300c77c6e9	420	if (dhcp->tries <= 1) {
tax	0:66300c77c6e9	421	dhcp_check(netif);
tax	0:66300c77c6e9	422	/* no ARP replies on the offered address,
tax	0:66300c77c6e9	423	looks like the IP address is indeed free */
tax	0:66300c77c6e9	424	} else {
tax	0:66300c77c6e9	425	/* bind the interface to the offered address */
tax	0:66300c77c6e9	426	dhcp_bind(netif);
tax	0:66300c77c6e9	427	}
tax	0:66300c77c6e9	428	#endif /* DHCP_DOES_ARP_CHECK */
tax	0:66300c77c6e9	429	}
tax	0:66300c77c6e9	430	/* did not get response to renew request? */
tax	0:66300c77c6e9	431	else if (dhcp->state == DHCP_RENEWING) {
tax	0:66300c77c6e9	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
tax	0:66300c77c6e9	433	/* just retry renewal */
tax	0:66300c77c6e9	434	/* note that the rebind timer will eventually time-out if renew does not work */
tax	0:66300c77c6e9	435	dhcp_renew(netif);
tax	0:66300c77c6e9	436	/* did not get response to rebind request? */
tax	0:66300c77c6e9	437	} else if (dhcp->state == DHCP_REBINDING) {
tax	0:66300c77c6e9	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
tax	0:66300c77c6e9	439	if (dhcp->tries <= 8) {
tax	0:66300c77c6e9	440	dhcp_rebind(netif);
tax	0:66300c77c6e9	441	} else {
tax	0:66300c77c6e9	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
tax	0:66300c77c6e9	443	dhcp_release(netif);
tax	0:66300c77c6e9	444	dhcp_discover(netif);
tax	0:66300c77c6e9	445	}
tax	0:66300c77c6e9	446	} else if (dhcp->state == DHCP_REBOOTING) {
tax	0:66300c77c6e9	447	if (dhcp->tries < REBOOT_TRIES) {
tax	0:66300c77c6e9	448	dhcp_reboot(netif);
tax	0:66300c77c6e9	449	} else {
tax	0:66300c77c6e9	450	dhcp_discover(netif);
tax	0:66300c77c6e9	451	}
tax	0:66300c77c6e9	452	}
tax	0:66300c77c6e9	453	}
tax	0:66300c77c6e9	454
tax	0:66300c77c6e9	455	/**
tax	0:66300c77c6e9	456	* The renewal period has timed out.
tax	0:66300c77c6e9	457	*
tax	0:66300c77c6e9	458	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	459	*/
tax	0:66300c77c6e9	460	static void
tax	0:66300c77c6e9	461	dhcp_t1_timeout(struct netif *netif)
tax	0:66300c77c6e9	462	{
tax	0:66300c77c6e9	463	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
tax	0:66300c77c6e9	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
tax	0:66300c77c6e9	466	(dhcp->state == DHCP_RENEWING)) {
tax	0:66300c77c6e9	467	/* just retry to renew - note that the rebind timer (t2) will
tax	0:66300c77c6e9	468	* eventually time-out if renew tries fail. */
tax	0:66300c77c6e9	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	470	("dhcp_t1_timeout(): must renew\n"));
tax	0:66300c77c6e9	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
tax	0:66300c77c6e9	472	DHCP_RENEWING, not DHCP_BOUND */
tax	0:66300c77c6e9	473	dhcp_renew(netif);
tax	0:66300c77c6e9	474	}
tax	0:66300c77c6e9	475	}
tax	0:66300c77c6e9	476
tax	0:66300c77c6e9	477	/**
tax	0:66300c77c6e9	478	* The rebind period has timed out.
tax	0:66300c77c6e9	479	*
tax	0:66300c77c6e9	480	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	481	*/
tax	0:66300c77c6e9	482	static void
tax	0:66300c77c6e9	483	dhcp_t2_timeout(struct netif *netif)
tax	0:66300c77c6e9	484	{
tax	0:66300c77c6e9	485	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
tax	0:66300c77c6e9	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
tax	0:66300c77c6e9	488	(dhcp->state == DHCP_RENEWING)) {
tax	0:66300c77c6e9	489	/* just retry to rebind */
tax	0:66300c77c6e9	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
tax	0:66300c77c6e9	491	("dhcp_t2_timeout(): must rebind\n"));
tax	0:66300c77c6e9	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
tax	0:66300c77c6e9	493	DHCP_REBINDING, not DHCP_BOUND */
tax	0:66300c77c6e9	494	dhcp_rebind(netif);
tax	0:66300c77c6e9	495	}
tax	0:66300c77c6e9	496	}
tax	0:66300c77c6e9	497
tax	0:66300c77c6e9	498	/**
tax	0:66300c77c6e9	499	* Handle a DHCP ACK packet
tax	0:66300c77c6e9	500	*
tax	0:66300c77c6e9	501	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	502	*/
tax	0:66300c77c6e9	503	static void
tax	0:66300c77c6e9	504	dhcp_handle_ack(struct netif *netif)
tax	0:66300c77c6e9	505	{
tax	0:66300c77c6e9	506	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	507	#if LWIP_DNS
tax	0:66300c77c6e9	508	u8_t n;
tax	0:66300c77c6e9	509	#endif /* LWIP_DNS */
tax	0:66300c77c6e9	510
tax	0:66300c77c6e9	511	/* clear options we might not get from the ACK */
tax	0:66300c77c6e9	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
tax	0:66300c77c6e9	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
tax	0:66300c77c6e9	514	#if LWIP_DHCP_BOOTP_FILE
tax	0:66300c77c6e9	515	ip_addr_set_zero(&dhcp->offered_si_addr);
tax	0:66300c77c6e9	516	#endif /* LWIP_DHCP_BOOTP_FILE */
tax	0:66300c77c6e9	517
tax	0:66300c77c6e9	518	/* lease time given? */
tax	0:66300c77c6e9	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
tax	0:66300c77c6e9	520	/* remember offered lease time */
tax	0:66300c77c6e9	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
tax	0:66300c77c6e9	522	}
tax	0:66300c77c6e9	523	/* renewal period given? */
tax	0:66300c77c6e9	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
tax	0:66300c77c6e9	525	/* remember given renewal period */
tax	0:66300c77c6e9	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
tax	0:66300c77c6e9	527	} else {
tax	0:66300c77c6e9	528	/* calculate safe periods for renewal */
tax	0:66300c77c6e9	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
tax	0:66300c77c6e9	530	}
tax	0:66300c77c6e9	531
tax	0:66300c77c6e9	532	/* renewal period given? */
tax	0:66300c77c6e9	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
tax	0:66300c77c6e9	534	/* remember given rebind period */
tax	0:66300c77c6e9	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
tax	0:66300c77c6e9	536	} else {
tax	0:66300c77c6e9	537	/* calculate safe periods for rebinding */
tax	0:66300c77c6e9	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
tax	0:66300c77c6e9	539	}
tax	0:66300c77c6e9	540
tax	0:66300c77c6e9	541	/* (y)our internet address */
tax	0:66300c77c6e9	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
tax	0:66300c77c6e9	543
tax	0:66300c77c6e9	544	#if LWIP_DHCP_BOOTP_FILE
tax	0:66300c77c6e9	545	/* copy boot server address,
tax	0:66300c77c6e9	546	boot file name copied in dhcp_parse_reply if not overloaded */
tax	0:66300c77c6e9	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
tax	0:66300c77c6e9	548	#endif /* LWIP_DHCP_BOOTP_FILE */
tax	0:66300c77c6e9	549
tax	0:66300c77c6e9	550	/* subnet mask given? */
tax	0:66300c77c6e9	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
tax	0:66300c77c6e9	552	/* remember given subnet mask */
tax	0:66300c77c6e9	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
tax	0:66300c77c6e9	554	dhcp->subnet_mask_given = 1;
tax	0:66300c77c6e9	555	} else {
tax	0:66300c77c6e9	556	dhcp->subnet_mask_given = 0;
tax	0:66300c77c6e9	557	}
tax	0:66300c77c6e9	558
tax	0:66300c77c6e9	559	/* gateway router */
tax	0:66300c77c6e9	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
tax	0:66300c77c6e9	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
tax	0:66300c77c6e9	562	}
tax	0:66300c77c6e9	563
tax	0:66300c77c6e9	564	#if LWIP_DNS
tax	0:66300c77c6e9	565	/* DNS servers */
tax	0:66300c77c6e9	566	n = 0;
tax	0:66300c77c6e9	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
tax	0:66300c77c6e9	568	ip_addr_t dns_addr;
tax	0:66300c77c6e9	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
tax	0:66300c77c6e9	570	dns_setserver(n, &dns_addr);
tax	0:66300c77c6e9	571	n++;
tax	0:66300c77c6e9	572	}
tax	0:66300c77c6e9	573	#endif /* LWIP_DNS */
tax	0:66300c77c6e9	574	}
tax	0:66300c77c6e9	575
tax	0:66300c77c6e9	576	/** Set a statically allocated struct dhcp to work with.
tax	0:66300c77c6e9	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
tax	0:66300c77c6e9	578	*
tax	0:66300c77c6e9	579	* @param netif the netif for which to set the struct dhcp
tax	0:66300c77c6e9	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
tax	0:66300c77c6e9	581	*/
tax	0:66300c77c6e9	582	void
tax	0:66300c77c6e9	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
tax	0:66300c77c6e9	584	{
tax	0:66300c77c6e9	585	LWIP_ASSERT("netif != NULL", netif != NULL);
tax	0:66300c77c6e9	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
tax	0:66300c77c6e9	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
tax	0:66300c77c6e9	588
tax	0:66300c77c6e9	589	/* clear data structure */
tax	0:66300c77c6e9	590	memset(dhcp, 0, sizeof(struct dhcp));
tax	0:66300c77c6e9	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
tax	0:66300c77c6e9	592	netif->dhcp = dhcp;
tax	0:66300c77c6e9	593	}
tax	0:66300c77c6e9	594
tax	0:66300c77c6e9	595	/**
tax	0:66300c77c6e9	596	* Start DHCP negotiation for a network interface.
tax	0:66300c77c6e9	597	*
tax	0:66300c77c6e9	598	* If no DHCP client instance was attached to this interface,
tax	0:66300c77c6e9	599	* a new client is created first. If a DHCP client instance
tax	0:66300c77c6e9	600	* was already present, it restarts negotiation.
tax	0:66300c77c6e9	601	*
tax	0:66300c77c6e9	602	* @param netif The lwIP network interface
tax	0:66300c77c6e9	603	* @return lwIP error code
tax	0:66300c77c6e9	604	* - ERR_OK - No error
tax	0:66300c77c6e9	605	* - ERR_MEM - Out of memory
tax	0:66300c77c6e9	606	*/
tax	0:66300c77c6e9	607	err_t
tax	0:66300c77c6e9	608	dhcp_start(struct netif *netif)
tax	0:66300c77c6e9	609	{
tax	0:66300c77c6e9	610	struct dhcp *dhcp;
tax	0:66300c77c6e9	611	err_t result = ERR_OK;
tax	0:66300c77c6e9	612
tax	0:66300c77c6e9	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
tax	0:66300c77c6e9	614	dhcp = netif->dhcp;
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	616	/* Remove the flag that says this netif is handled by DHCP,
tax	0:66300c77c6e9	617	it is set when we succeeded starting. */
tax	0:66300c77c6e9	618	netif->flags &= ~NETIF_FLAG_DHCP;
tax	0:66300c77c6e9	619
tax	0:66300c77c6e9	620	/* check hwtype of the netif */
tax	0:66300c77c6e9	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
tax	0:66300c77c6e9	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
tax	0:66300c77c6e9	623	return ERR_ARG;
tax	0:66300c77c6e9	624	}
tax	0:66300c77c6e9	625
tax	0:66300c77c6e9	626	/* check MTU of the netif */
tax	0:66300c77c6e9	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
tax	0:66300c77c6e9	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
tax	0:66300c77c6e9	629	return ERR_MEM;
tax	0:66300c77c6e9	630	}
tax	0:66300c77c6e9	631
tax	0:66300c77c6e9	632	/* no DHCP client attached yet? */
tax	0:66300c77c6e9	633	if (dhcp == NULL) {
tax	0:66300c77c6e9	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
tax	0:66300c77c6e9	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
tax	0:66300c77c6e9	636	if (dhcp == NULL) {
tax	0:66300c77c6e9	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
tax	0:66300c77c6e9	638	return ERR_MEM;
tax	0:66300c77c6e9	639	}
tax	0:66300c77c6e9	640	/* store this dhcp client in the netif */
tax	0:66300c77c6e9	641	netif->dhcp = dhcp;
tax	0:66300c77c6e9	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
tax	0:66300c77c6e9	643	/* already has DHCP client attached */
tax	0:66300c77c6e9	644	} else {
tax	0:66300c77c6e9	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
tax	0:66300c77c6e9	646	if (dhcp->pcb != NULL) {
tax	0:66300c77c6e9	647	udp_remove(dhcp->pcb);
tax	0:66300c77c6e9	648	}
tax	0:66300c77c6e9	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
tax	0:66300c77c6e9	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
tax	0:66300c77c6e9	651	}
tax	0:66300c77c6e9	652
tax	0:66300c77c6e9	653	/* clear data structure */
tax	0:66300c77c6e9	654	memset(dhcp, 0, sizeof(struct dhcp));
tax	0:66300c77c6e9	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
tax	0:66300c77c6e9	656	/* allocate UDP PCB */
tax	0:66300c77c6e9	657	dhcp->pcb = udp_new();
tax	0:66300c77c6e9	658	if (dhcp->pcb == NULL) {
tax	0:66300c77c6e9	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
tax	0:66300c77c6e9	660	return ERR_MEM;
tax	0:66300c77c6e9	661	}
tax	0:66300c77c6e9	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
tax	0:66300c77c6e9	663	/* set up local and remote port for the pcb */
tax	0:66300c77c6e9	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
tax	0:66300c77c6e9	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
tax	0:66300c77c6e9	666	/* set up the recv callback and argument */
tax	0:66300c77c6e9	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
tax	0:66300c77c6e9	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
tax	0:66300c77c6e9	669	/* (re)start the DHCP negotiation */
tax	0:66300c77c6e9	670	result = dhcp_discover(netif);
tax	0:66300c77c6e9	671	if (result != ERR_OK) {
tax	0:66300c77c6e9	672	/* free resources allocated above */
tax	0:66300c77c6e9	673	dhcp_stop(netif);
tax	0:66300c77c6e9	674	return ERR_MEM;
tax	0:66300c77c6e9	675	}
tax	0:66300c77c6e9	676	/* Set the flag that says this netif is handled by DHCP. */
tax	0:66300c77c6e9	677	netif->flags \|= NETIF_FLAG_DHCP;
tax	0:66300c77c6e9	678	return result;
tax	0:66300c77c6e9	679	}
tax	0:66300c77c6e9	680
tax	0:66300c77c6e9	681	/**
tax	0:66300c77c6e9	682	* Inform a DHCP server of our manual configuration.
tax	0:66300c77c6e9	683	*
tax	0:66300c77c6e9	684	* This informs DHCP servers of our fixed IP address configuration
tax	0:66300c77c6e9	685	* by sending an INFORM message. It does not involve DHCP address
tax	0:66300c77c6e9	686	* configuration, it is just here to be nice to the network.
tax	0:66300c77c6e9	687	*
tax	0:66300c77c6e9	688	* @param netif The lwIP network interface
tax	0:66300c77c6e9	689	*/
tax	0:66300c77c6e9	690	void
tax	0:66300c77c6e9	691	dhcp_inform(struct netif *netif)
tax	0:66300c77c6e9	692	{
tax	0:66300c77c6e9	693	struct dhcp dhcp;
tax	0:66300c77c6e9	694	err_t result = ERR_OK;
tax	0:66300c77c6e9	695	struct udp_pcb *pcb;
tax	0:66300c77c6e9	696
tax	0:66300c77c6e9	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
tax	0:66300c77c6e9	698
tax	0:66300c77c6e9	699	memset(&dhcp, 0, sizeof(struct dhcp));
tax	0:66300c77c6e9	700	dhcp_set_state(&dhcp, DHCP_INFORM);
tax	0:66300c77c6e9	701
tax	0:66300c77c6e9	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
tax	0:66300c77c6e9	703	/* re-use existing pcb */
tax	0:66300c77c6e9	704	pcb = netif->dhcp->pcb;
tax	0:66300c77c6e9	705	} else {
tax	0:66300c77c6e9	706	pcb = udp_new();
tax	0:66300c77c6e9	707	if (pcb == NULL) {
tax	0:66300c77c6e9	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
tax	0:66300c77c6e9	709	return;
tax	0:66300c77c6e9	710	}
tax	0:66300c77c6e9	711	dhcp.pcb = pcb;
tax	0:66300c77c6e9	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
tax	0:66300c77c6e9	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
tax	0:66300c77c6e9	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
tax	0:66300c77c6e9	715	}
tax	0:66300c77c6e9	716	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
tax	0:66300c77c6e9	718	if (result == ERR_OK) {
tax	0:66300c77c6e9	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
tax	0:66300c77c6e9	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
tax	0:66300c77c6e9	721
tax	0:66300c77c6e9	722	dhcp_option_trailer(&dhcp);
tax	0:66300c77c6e9	723
tax	0:66300c77c6e9	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
tax	0:66300c77c6e9	725
tax	0:66300c77c6e9	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
tax	0:66300c77c6e9	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	728	dhcp_delete_msg(&dhcp);
tax	0:66300c77c6e9	729	} else {
tax	0:66300c77c6e9	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	731	}
tax	0:66300c77c6e9	732
tax	0:66300c77c6e9	733	if (dhcp.pcb != NULL) {
tax	0:66300c77c6e9	734	/* otherwise, the existing pcb was used */
tax	0:66300c77c6e9	735	udp_remove(dhcp.pcb);
tax	0:66300c77c6e9	736	}
tax	0:66300c77c6e9	737	}
tax	0:66300c77c6e9	738
tax	0:66300c77c6e9	739	/** Handle a possible change in the network configuration.
tax	0:66300c77c6e9	740	*
tax	0:66300c77c6e9	741	* This enters the REBOOTING state to verify that the currently bound
tax	0:66300c77c6e9	742	* address is still valid.
tax	0:66300c77c6e9	743	*/
tax	0:66300c77c6e9	744	void
tax	0:66300c77c6e9	745	dhcp_network_changed(struct netif *netif)
tax	0:66300c77c6e9	746	{
tax	0:66300c77c6e9	747	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	748	if (!dhcp)
tax	0:66300c77c6e9	749	return;
tax	0:66300c77c6e9	750	switch (dhcp->state) {
tax	0:66300c77c6e9	751	case DHCP_REBINDING:
tax	0:66300c77c6e9	752	case DHCP_RENEWING:
tax	0:66300c77c6e9	753	case DHCP_BOUND:
tax	0:66300c77c6e9	754	case DHCP_REBOOTING:
tax	0:66300c77c6e9	755	netif_set_down(netif);
tax	0:66300c77c6e9	756	dhcp->tries = 0;
tax	0:66300c77c6e9	757	dhcp_reboot(netif);
tax	0:66300c77c6e9	758	break;
tax	0:66300c77c6e9	759	case DHCP_OFF:
tax	0:66300c77c6e9	760	/* stay off */
tax	0:66300c77c6e9	761	break;
tax	0:66300c77c6e9	762	default:
tax	0:66300c77c6e9	763	dhcp->tries = 0;
tax	0:66300c77c6e9	764	#if LWIP_DHCP_AUTOIP_COOP
tax	0:66300c77c6e9	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
tax	0:66300c77c6e9	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
tax	0:66300c77c6e9	767	dhcp_discover(netif);
tax	0:66300c77c6e9	768	break;
tax	0:66300c77c6e9	769	}
tax	0:66300c77c6e9	770	}
tax	0:66300c77c6e9	771
tax	0:66300c77c6e9	772	#if DHCP_DOES_ARP_CHECK
tax	0:66300c77c6e9	773	/**
tax	0:66300c77c6e9	774	* Match an ARP reply with the offered IP address.
tax	0:66300c77c6e9	775	*
tax	0:66300c77c6e9	776	* @param netif the network interface on which the reply was received
tax	0:66300c77c6e9	777	* @param addr The IP address we received a reply from
tax	0:66300c77c6e9	778	*/
tax	0:66300c77c6e9	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
tax	0:66300c77c6e9	780	{
tax	0:66300c77c6e9	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
tax	0:66300c77c6e9	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
tax	0:66300c77c6e9	783	/* is a DHCP client doing an ARP check? */
tax	0:66300c77c6e9	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
tax	0:66300c77c6e9	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
tax	0:66300c77c6e9	786	ip4_addr_get_u32(addr)));
tax	0:66300c77c6e9	787	/* did a host respond with the address we
tax	0:66300c77c6e9	788	were offered by the DHCP server? */
tax	0:66300c77c6e9	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
tax	0:66300c77c6e9	790	/* we will not accept the offered address */
tax	0:66300c77c6e9	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
tax	0:66300c77c6e9	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
tax	0:66300c77c6e9	793	dhcp_decline(netif);
tax	0:66300c77c6e9	794	}
tax	0:66300c77c6e9	795	}
tax	0:66300c77c6e9	796	}
tax	0:66300c77c6e9	797
tax	0:66300c77c6e9	798	/**
tax	0:66300c77c6e9	799	* Decline an offered lease.
tax	0:66300c77c6e9	800	*
tax	0:66300c77c6e9	801	* Tell the DHCP server we do not accept the offered address.
tax	0:66300c77c6e9	802	* One reason to decline the lease is when we find out the address
tax	0:66300c77c6e9	803	* is already in use by another host (through ARP).
tax	0:66300c77c6e9	804	*
tax	0:66300c77c6e9	805	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	806	*/
tax	0:66300c77c6e9	807	static err_t
tax	0:66300c77c6e9	808	dhcp_decline(struct netif *netif)
tax	0:66300c77c6e9	809	{
tax	0:66300c77c6e9	810	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	811	err_t result = ERR_OK;
tax	0:66300c77c6e9	812	u16_t msecs;
tax	0:66300c77c6e9	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
tax	0:66300c77c6e9	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
tax	0:66300c77c6e9	815	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
tax	0:66300c77c6e9	817	if (result == ERR_OK) {
tax	0:66300c77c6e9	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
tax	0:66300c77c6e9	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
tax	0:66300c77c6e9	820
tax	0:66300c77c6e9	821	dhcp_option_trailer(dhcp);
tax	0:66300c77c6e9	822	/* resize pbuf to reflect true size of options */
tax	0:66300c77c6e9	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
tax	0:66300c77c6e9	824
tax	0:66300c77c6e9	825	/* per section 4.4.4, broadcast DECLINE messages */
tax	0:66300c77c6e9	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	827	dhcp_delete_msg(dhcp);
tax	0:66300c77c6e9	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
tax	0:66300c77c6e9	829	} else {
tax	0:66300c77c6e9	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	831	("dhcp_decline: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	832	}
tax	0:66300c77c6e9	833	dhcp->tries++;
tax	0:66300c77c6e9	834	msecs = 10*1000;
tax	0:66300c77c6e9	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	837	return result;
tax	0:66300c77c6e9	838	}
tax	0:66300c77c6e9	839	#endif /* DHCP_DOES_ARP_CHECK */
tax	0:66300c77c6e9	840
tax	0:66300c77c6e9	841
tax	0:66300c77c6e9	842	/**
tax	0:66300c77c6e9	843	* Start the DHCP process, discover a DHCP server.
tax	0:66300c77c6e9	844	*
tax	0:66300c77c6e9	845	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	846	*/
tax	0:66300c77c6e9	847	static err_t
tax	0:66300c77c6e9	848	dhcp_discover(struct netif *netif)
tax	0:66300c77c6e9	849	{
tax	0:66300c77c6e9	850	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	851	err_t result = ERR_OK;
tax	0:66300c77c6e9	852	u16_t msecs;
tax	0:66300c77c6e9	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
tax	0:66300c77c6e9	854	ip_addr_set_any(&dhcp->offered_ip_addr);
tax	0:66300c77c6e9	855	dhcp_set_state(dhcp, DHCP_SELECTING);
tax	0:66300c77c6e9	856	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
tax	0:66300c77c6e9	858	if (result == ERR_OK) {
tax	0:66300c77c6e9	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
tax	0:66300c77c6e9	860
tax	0:66300c77c6e9	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
tax	0:66300c77c6e9	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
tax	0:66300c77c6e9	863
tax	0:66300c77c6e9	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
tax	0:66300c77c6e9	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
tax	0:66300c77c6e9	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
tax	0:66300c77c6e9	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
tax	0:66300c77c6e9	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
tax	0:66300c77c6e9	869
tax	0:66300c77c6e9	870	dhcp_option_trailer(dhcp);
tax	0:66300c77c6e9	871
tax	0:66300c77c6e9	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
tax	0:66300c77c6e9	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
tax	0:66300c77c6e9	874
tax	0:66300c77c6e9	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
tax	0:66300c77c6e9	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
tax	0:66300c77c6e9	878	dhcp_delete_msg(dhcp);
tax	0:66300c77c6e9	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
tax	0:66300c77c6e9	880	} else {
tax	0:66300c77c6e9	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	882	}
tax	0:66300c77c6e9	883	dhcp->tries++;
tax	0:66300c77c6e9	884	#if LWIP_DHCP_AUTOIP_COOP
tax	0:66300c77c6e9	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
tax	0:66300c77c6e9	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
tax	0:66300c77c6e9	887	autoip_start(netif);
tax	0:66300c77c6e9	888	}
tax	0:66300c77c6e9	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
tax	0:66300c77c6e9	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
tax	0:66300c77c6e9	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	893	return result;
tax	0:66300c77c6e9	894	}
tax	0:66300c77c6e9	895
tax	0:66300c77c6e9	896
tax	0:66300c77c6e9	897	/**
tax	0:66300c77c6e9	898	* Bind the interface to the offered IP address.
tax	0:66300c77c6e9	899	*
tax	0:66300c77c6e9	900	* @param netif network interface to bind to the offered address
tax	0:66300c77c6e9	901	*/
tax	0:66300c77c6e9	902	static void
tax	0:66300c77c6e9	903	dhcp_bind(struct netif *netif)
tax	0:66300c77c6e9	904	{
tax	0:66300c77c6e9	905	u32_t timeout;
tax	0:66300c77c6e9	906	struct dhcp *dhcp;
tax	0:66300c77c6e9	907	ip_addr_t sn_mask, gw_addr;
tax	0:66300c77c6e9	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
tax	0:66300c77c6e9	909	dhcp = netif->dhcp;
tax	0:66300c77c6e9	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	912
tax	0:66300c77c6e9	913	/* temporary DHCP lease? */
tax	0:66300c77c6e9	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
tax	0:66300c77c6e9	915	/* set renewal period timer */
tax	0:66300c77c6e9	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
tax	0:66300c77c6e9	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
tax	0:66300c77c6e9	918	if(timeout > 0xffff) {
tax	0:66300c77c6e9	919	timeout = 0xffff;
tax	0:66300c77c6e9	920	}
tax	0:66300c77c6e9	921	dhcp->t1_timeout = (u16_t)timeout;
tax	0:66300c77c6e9	922	if (dhcp->t1_timeout == 0) {
tax	0:66300c77c6e9	923	dhcp->t1_timeout = 1;
tax	0:66300c77c6e9	924	}
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	926	}
tax	0:66300c77c6e9	927	/* set renewal period timer */
tax	0:66300c77c6e9	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
tax	0:66300c77c6e9	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
tax	0:66300c77c6e9	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
tax	0:66300c77c6e9	931	if(timeout > 0xffff) {
tax	0:66300c77c6e9	932	timeout = 0xffff;
tax	0:66300c77c6e9	933	}
tax	0:66300c77c6e9	934	dhcp->t2_timeout = (u16_t)timeout;
tax	0:66300c77c6e9	935	if (dhcp->t2_timeout == 0) {
tax	0:66300c77c6e9	936	dhcp->t2_timeout = 1;
tax	0:66300c77c6e9	937	}
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	939	}
tax	0:66300c77c6e9	940
tax	0:66300c77c6e9	941	if (dhcp->subnet_mask_given) {
tax	0:66300c77c6e9	942	/* copy offered network mask */
tax	0:66300c77c6e9	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
tax	0:66300c77c6e9	944	} else {
tax	0:66300c77c6e9	945	/* subnet mask not given, choose a safe subnet mask given the network class */
tax	0:66300c77c6e9	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
tax	0:66300c77c6e9	947	if (first_octet <= 127) {
tax	0:66300c77c6e9	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
tax	0:66300c77c6e9	949	} else if (first_octet >= 192) {
tax	0:66300c77c6e9	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
tax	0:66300c77c6e9	951	} else {
tax	0:66300c77c6e9	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
tax	0:66300c77c6e9	953	}
tax	0:66300c77c6e9	954	}
tax	0:66300c77c6e9	955
tax	0:66300c77c6e9	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
tax	0:66300c77c6e9	957	/* gateway address not given? */
tax	0:66300c77c6e9	958	if (ip_addr_isany(&gw_addr)) {
tax	0:66300c77c6e9	959	/* copy network address */
tax	0:66300c77c6e9	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
tax	0:66300c77c6e9	961	/* use first host address on network as gateway */
tax	0:66300c77c6e9	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
tax	0:66300c77c6e9	963	}
tax	0:66300c77c6e9	964
tax	0:66300c77c6e9	965	#if LWIP_DHCP_AUTOIP_COOP
tax	0:66300c77c6e9	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
tax	0:66300c77c6e9	967	autoip_stop(netif);
tax	0:66300c77c6e9	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
tax	0:66300c77c6e9	969	}
tax	0:66300c77c6e9	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
tax	0:66300c77c6e9	971
tax	0:66300c77c6e9	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
tax	0:66300c77c6e9	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
tax	0:66300c77c6e9	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
tax	0:66300c77c6e9	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
tax	0:66300c77c6e9	976	ip4_addr_get_u32(&sn_mask)));
tax	0:66300c77c6e9	977	netif_set_netmask(netif, &sn_mask);
tax	0:66300c77c6e9	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
tax	0:66300c77c6e9	979	ip4_addr_get_u32(&gw_addr)));
tax	0:66300c77c6e9	980	netif_set_gw(netif, &gw_addr);
tax	0:66300c77c6e9	981	/* bring the interface up */
tax	0:66300c77c6e9	982	netif_set_up(netif);
tax	0:66300c77c6e9	983	/* netif is now bound to DHCP leased address */
tax	0:66300c77c6e9	984	dhcp_set_state(dhcp, DHCP_BOUND);
tax	0:66300c77c6e9	985	}
tax	0:66300c77c6e9	986
tax	0:66300c77c6e9	987	/**
tax	0:66300c77c6e9	988	* Renew an existing DHCP lease at the involved DHCP server.
tax	0:66300c77c6e9	989	*
tax	0:66300c77c6e9	990	* @param netif network interface which must renew its lease
tax	0:66300c77c6e9	991	*/
tax	0:66300c77c6e9	992	err_t
tax	0:66300c77c6e9	993	dhcp_renew(struct netif *netif)
tax	0:66300c77c6e9	994	{
tax	0:66300c77c6e9	995	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	996	err_t result;
tax	0:66300c77c6e9	997	u16_t msecs;
tax	0:66300c77c6e9	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
tax	0:66300c77c6e9	999	dhcp_set_state(dhcp, DHCP_RENEWING);
tax	0:66300c77c6e9	1000
tax	0:66300c77c6e9	1001	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
tax	0:66300c77c6e9	1003	if (result == ERR_OK) {
tax	0:66300c77c6e9	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
tax	0:66300c77c6e9	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
tax	0:66300c77c6e9	1006
tax	0:66300c77c6e9	1007	#if LWIP_NETIF_HOSTNAME
tax	0:66300c77c6e9	1008	if (netif->hostname != NULL) {
tax	0:66300c77c6e9	1009	const char p = (const char)netif->hostname;
tax	0:66300c77c6e9	1010	u8_t namelen = (u8_t)strlen(p);
tax	0:66300c77c6e9	1011	if (namelen > 0) {
tax	0:66300c77c6e9	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
tax	0:66300c77c6e9	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
tax	0:66300c77c6e9	1014	while (*p) {
tax	0:66300c77c6e9	1015	dhcp_option_byte(dhcp, *p++);
tax	0:66300c77c6e9	1016	}
tax	0:66300c77c6e9	1017	}
tax	0:66300c77c6e9	1018	}
tax	0:66300c77c6e9	1019	#endif /* LWIP_NETIF_HOSTNAME */
tax	0:66300c77c6e9	1020
tax	0:66300c77c6e9	1021	#if 0
tax	0:66300c77c6e9	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
tax	0:66300c77c6e9	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
tax	0:66300c77c6e9	1024	#endif
tax	0:66300c77c6e9	1025
tax	0:66300c77c6e9	1026	#if 0
tax	0:66300c77c6e9	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
tax	0:66300c77c6e9	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
tax	0:66300c77c6e9	1029	#endif
tax	0:66300c77c6e9	1030	/* append DHCP message trailer */
tax	0:66300c77c6e9	1031	dhcp_option_trailer(dhcp);
tax	0:66300c77c6e9	1032
tax	0:66300c77c6e9	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
tax	0:66300c77c6e9	1034
tax	0:66300c77c6e9	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	1036	dhcp_delete_msg(dhcp);
tax	0:66300c77c6e9	1037
tax	0:66300c77c6e9	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
tax	0:66300c77c6e9	1039	} else {
tax	0:66300c77c6e9	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	1041	}
tax	0:66300c77c6e9	1042	dhcp->tries++;
tax	0:66300c77c6e9	1043	/* back-off on retries, but to a maximum of 20 seconds */
tax	0:66300c77c6e9	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
tax	0:66300c77c6e9	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	1047	return result;
tax	0:66300c77c6e9	1048	}
tax	0:66300c77c6e9	1049
tax	0:66300c77c6e9	1050	/**
tax	0:66300c77c6e9	1051	* Rebind with a DHCP server for an existing DHCP lease.
tax	0:66300c77c6e9	1052	*
tax	0:66300c77c6e9	1053	* @param netif network interface which must rebind with a DHCP server
tax	0:66300c77c6e9	1054	*/
tax	0:66300c77c6e9	1055	static err_t
tax	0:66300c77c6e9	1056	dhcp_rebind(struct netif *netif)
tax	0:66300c77c6e9	1057	{
tax	0:66300c77c6e9	1058	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	1059	err_t result;
tax	0:66300c77c6e9	1060	u16_t msecs;
tax	0:66300c77c6e9	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
tax	0:66300c77c6e9	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
tax	0:66300c77c6e9	1063
tax	0:66300c77c6e9	1064	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
tax	0:66300c77c6e9	1066	if (result == ERR_OK) {
tax	0:66300c77c6e9	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
tax	0:66300c77c6e9	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
tax	0:66300c77c6e9	1069
tax	0:66300c77c6e9	1070	#if LWIP_NETIF_HOSTNAME
tax	0:66300c77c6e9	1071	if (netif->hostname != NULL) {
tax	0:66300c77c6e9	1072	const char p = (const char)netif->hostname;
tax	0:66300c77c6e9	1073	u8_t namelen = (u8_t)strlen(p);
tax	0:66300c77c6e9	1074	if (namelen > 0) {
tax	0:66300c77c6e9	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
tax	0:66300c77c6e9	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
tax	0:66300c77c6e9	1077	while (*p) {
tax	0:66300c77c6e9	1078	dhcp_option_byte(dhcp, *p++);
tax	0:66300c77c6e9	1079	}
tax	0:66300c77c6e9	1080	}
tax	0:66300c77c6e9	1081	}
tax	0:66300c77c6e9	1082	#endif /* LWIP_NETIF_HOSTNAME */
tax	0:66300c77c6e9	1083
tax	0:66300c77c6e9	1084	#if 0
tax	0:66300c77c6e9	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
tax	0:66300c77c6e9	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
tax	0:66300c77c6e9	1087
tax	0:66300c77c6e9	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
tax	0:66300c77c6e9	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
tax	0:66300c77c6e9	1090	#endif
tax	0:66300c77c6e9	1091
tax	0:66300c77c6e9	1092	dhcp_option_trailer(dhcp);
tax	0:66300c77c6e9	1093
tax	0:66300c77c6e9	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
tax	0:66300c77c6e9	1095
tax	0:66300c77c6e9	1096	/* broadcast to server */
tax	0:66300c77c6e9	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	1098	dhcp_delete_msg(dhcp);
tax	0:66300c77c6e9	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
tax	0:66300c77c6e9	1100	} else {
tax	0:66300c77c6e9	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	1102	}
tax	0:66300c77c6e9	1103	dhcp->tries++;
tax	0:66300c77c6e9	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
tax	0:66300c77c6e9	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	1107	return result;
tax	0:66300c77c6e9	1108	}
tax	0:66300c77c6e9	1109
tax	0:66300c77c6e9	1110	/**
tax	0:66300c77c6e9	1111	* Enter REBOOTING state to verify an existing lease
tax	0:66300c77c6e9	1112	*
tax	0:66300c77c6e9	1113	* @param netif network interface which must reboot
tax	0:66300c77c6e9	1114	*/
tax	0:66300c77c6e9	1115	static err_t
tax	0:66300c77c6e9	1116	dhcp_reboot(struct netif *netif)
tax	0:66300c77c6e9	1117	{
tax	0:66300c77c6e9	1118	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	1119	err_t result;
tax	0:66300c77c6e9	1120	u16_t msecs;
tax	0:66300c77c6e9	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
tax	0:66300c77c6e9	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
tax	0:66300c77c6e9	1123
tax	0:66300c77c6e9	1124	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
tax	0:66300c77c6e9	1126	if (result == ERR_OK) {
tax	0:66300c77c6e9	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
tax	0:66300c77c6e9	1128	dhcp_option_short(dhcp, 576);
tax	0:66300c77c6e9	1129
tax	0:66300c77c6e9	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
tax	0:66300c77c6e9	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
tax	0:66300c77c6e9	1132
tax	0:66300c77c6e9	1133	dhcp_option_trailer(dhcp);
tax	0:66300c77c6e9	1134
tax	0:66300c77c6e9	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
tax	0:66300c77c6e9	1136
tax	0:66300c77c6e9	1137	/* broadcast to server */
tax	0:66300c77c6e9	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	1139	dhcp_delete_msg(dhcp);
tax	0:66300c77c6e9	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
tax	0:66300c77c6e9	1141	} else {
tax	0:66300c77c6e9	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	1143	}
tax	0:66300c77c6e9	1144	dhcp->tries++;
tax	0:66300c77c6e9	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
tax	0:66300c77c6e9	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	1148	return result;
tax	0:66300c77c6e9	1149	}
tax	0:66300c77c6e9	1150
tax	0:66300c77c6e9	1151
tax	0:66300c77c6e9	1152	/**
tax	0:66300c77c6e9	1153	* Release a DHCP lease.
tax	0:66300c77c6e9	1154	*
tax	0:66300c77c6e9	1155	* @param netif network interface which must release its lease
tax	0:66300c77c6e9	1156	*/
tax	0:66300c77c6e9	1157	err_t
tax	0:66300c77c6e9	1158	dhcp_release(struct netif *netif)
tax	0:66300c77c6e9	1159	{
tax	0:66300c77c6e9	1160	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	1161	err_t result;
tax	0:66300c77c6e9	1162	u16_t msecs;
tax	0:66300c77c6e9	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
tax	0:66300c77c6e9	1164
tax	0:66300c77c6e9	1165	/* idle DHCP client */
tax	0:66300c77c6e9	1166	dhcp_set_state(dhcp, DHCP_OFF);
tax	0:66300c77c6e9	1167	/* clean old DHCP offer */
tax	0:66300c77c6e9	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
tax	0:66300c77c6e9	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
tax	0:66300c77c6e9	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
tax	0:66300c77c6e9	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
tax	0:66300c77c6e9	1172	#if LWIP_DHCP_BOOTP_FILE
tax	0:66300c77c6e9	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
tax	0:66300c77c6e9	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
tax	0:66300c77c6e9	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
tax	0:66300c77c6e9	1176
tax	0:66300c77c6e9	1177	/* create and initialize the DHCP message header */
tax	0:66300c77c6e9	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
tax	0:66300c77c6e9	1179	if (result == ERR_OK) {
tax	0:66300c77c6e9	1180	dhcp_option_trailer(dhcp);
tax	0:66300c77c6e9	1181
tax	0:66300c77c6e9	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
tax	0:66300c77c6e9	1183
tax	0:66300c77c6e9	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
tax	0:66300c77c6e9	1185	dhcp_delete_msg(dhcp);
tax	0:66300c77c6e9	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
tax	0:66300c77c6e9	1187	} else {
tax	0:66300c77c6e9	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
tax	0:66300c77c6e9	1189	}
tax	0:66300c77c6e9	1190	dhcp->tries++;
tax	0:66300c77c6e9	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
tax	0:66300c77c6e9	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
tax	0:66300c77c6e9	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
tax	0:66300c77c6e9	1194	/* bring the interface down */
tax	0:66300c77c6e9	1195	netif_set_down(netif);
tax	0:66300c77c6e9	1196	/* remove IP address from interface */
tax	0:66300c77c6e9	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
tax	0:66300c77c6e9	1198	netif_set_gw(netif, IP_ADDR_ANY);
tax	0:66300c77c6e9	1199	netif_set_netmask(netif, IP_ADDR_ANY);
tax	0:66300c77c6e9	1200
tax	0:66300c77c6e9	1201	return result;
tax	0:66300c77c6e9	1202	}
tax	0:66300c77c6e9	1203
tax	0:66300c77c6e9	1204	/**
tax	0:66300c77c6e9	1205	* Remove the DHCP client from the interface.
tax	0:66300c77c6e9	1206	*
tax	0:66300c77c6e9	1207	* @param netif The network interface to stop DHCP on
tax	0:66300c77c6e9	1208	*/
tax	0:66300c77c6e9	1209	void
tax	0:66300c77c6e9	1210	dhcp_stop(struct netif *netif)
tax	0:66300c77c6e9	1211	{
tax	0:66300c77c6e9	1212	struct dhcp *dhcp;
tax	0:66300c77c6e9	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
tax	0:66300c77c6e9	1214	dhcp = netif->dhcp;
tax	0:66300c77c6e9	1215	/* Remove the flag that says this netif is handled by DHCP. */
tax	0:66300c77c6e9	1216	netif->flags &= ~NETIF_FLAG_DHCP;
tax	0:66300c77c6e9	1217
tax	0:66300c77c6e9	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
tax	0:66300c77c6e9	1219	/* netif is DHCP configured? */
tax	0:66300c77c6e9	1220	if (dhcp != NULL) {
tax	0:66300c77c6e9	1221	#if LWIP_DHCP_AUTOIP_COOP
tax	0:66300c77c6e9	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
tax	0:66300c77c6e9	1223	autoip_stop(netif);
tax	0:66300c77c6e9	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
tax	0:66300c77c6e9	1225	}
tax	0:66300c77c6e9	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
tax	0:66300c77c6e9	1227
tax	0:66300c77c6e9	1228	if (dhcp->pcb != NULL) {
tax	0:66300c77c6e9	1229	udp_remove(dhcp->pcb);
tax	0:66300c77c6e9	1230	dhcp->pcb = NULL;
tax	0:66300c77c6e9	1231	}
tax	0:66300c77c6e9	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
tax	0:66300c77c6e9	1233	dhcp_set_state(dhcp, DHCP_OFF);
tax	0:66300c77c6e9	1234	}
tax	0:66300c77c6e9	1235	}
tax	0:66300c77c6e9	1236
tax	0:66300c77c6e9	1237	/*
tax	0:66300c77c6e9	1238	* Set the DHCP state of a DHCP client.
tax	0:66300c77c6e9	1239	*
tax	0:66300c77c6e9	1240	* If the state changed, reset the number of tries.
tax	0:66300c77c6e9	1241	*/
tax	0:66300c77c6e9	1242	static void
tax	0:66300c77c6e9	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
tax	0:66300c77c6e9	1244	{
tax	0:66300c77c6e9	1245	if (new_state != dhcp->state) {
tax	0:66300c77c6e9	1246	dhcp->state = new_state;
tax	0:66300c77c6e9	1247	dhcp->tries = 0;
tax	0:66300c77c6e9	1248	dhcp->request_timeout = 0;
tax	0:66300c77c6e9	1249	}
tax	0:66300c77c6e9	1250	}
tax	0:66300c77c6e9	1251
tax	0:66300c77c6e9	1252	/*
tax	0:66300c77c6e9	1253	* Concatenate an option type and length field to the outgoing
tax	0:66300c77c6e9	1254	* DHCP message.
tax	0:66300c77c6e9	1255	*
tax	0:66300c77c6e9	1256	*/
tax	0:66300c77c6e9	1257	static void
tax	0:66300c77c6e9	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
tax	0:66300c77c6e9	1259	{
tax	0:66300c77c6e9	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);
tax	0:66300c77c6e9	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
tax	0:66300c77c6e9	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
tax	0:66300c77c6e9	1263	}
tax	0:66300c77c6e9	1264	/*
tax	0:66300c77c6e9	1265	* Concatenate a single byte to the outgoing DHCP message.
tax	0:66300c77c6e9	1266	*
tax	0:66300c77c6e9	1267	*/
tax	0:66300c77c6e9	1268	static void
tax	0:66300c77c6e9	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
tax	0:66300c77c6e9	1270	{
tax	0:66300c77c6e9	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
tax	0:66300c77c6e9	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
tax	0:66300c77c6e9	1273	}
tax	0:66300c77c6e9	1274
tax	0:66300c77c6e9	1275	static void
tax	0:66300c77c6e9	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
tax	0:66300c77c6e9	1277	{
tax	0:66300c77c6e9	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
tax	0:66300c77c6e9	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
tax	0:66300c77c6e9	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
tax	0:66300c77c6e9	1281	}
tax	0:66300c77c6e9	1282
tax	0:66300c77c6e9	1283	static void
tax	0:66300c77c6e9	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
tax	0:66300c77c6e9	1285	{
tax	0:66300c77c6e9	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
tax	0:66300c77c6e9	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
tax	0:66300c77c6e9	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
tax	0:66300c77c6e9	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
tax	0:66300c77c6e9	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
tax	0:66300c77c6e9	1291	}
tax	0:66300c77c6e9	1292
tax	0:66300c77c6e9	1293	/**
tax	0:66300c77c6e9	1294	* Extract the DHCP message and the DHCP options.
tax	0:66300c77c6e9	1295	*
tax	0:66300c77c6e9	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
tax	0:66300c77c6e9	1297	* piece of memory. As a DHCP message is variable sized by its options,
tax	0:66300c77c6e9	1298	* and also allows overriding some fields for options, the easy approach
tax	0:66300c77c6e9	1299	* is to first unfold the options into a conitguous piece of memory, and
tax	0:66300c77c6e9	1300	* use that further on.
tax	0:66300c77c6e9	1301	*
tax	0:66300c77c6e9	1302	*/
tax	0:66300c77c6e9	1303	static err_t
tax	0:66300c77c6e9	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
tax	0:66300c77c6e9	1305	{
tax	0:66300c77c6e9	1306	u8_t *options;
tax	0:66300c77c6e9	1307	u16_t offset;
tax	0:66300c77c6e9	1308	u16_t offset_max;
tax	0:66300c77c6e9	1309	u16_t options_idx;
tax	0:66300c77c6e9	1310	u16_t options_idx_max;
tax	0:66300c77c6e9	1311	struct pbuf *q;
tax	0:66300c77c6e9	1312	int parse_file_as_options = 0;
tax	0:66300c77c6e9	1313	int parse_sname_as_options = 0;
tax	0:66300c77c6e9	1314
tax	0:66300c77c6e9	1315	/* clear received options */
tax	0:66300c77c6e9	1316	dhcp_clear_all_options(dhcp);
tax	0:66300c77c6e9	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
tax	0:66300c77c6e9	1318	if (p->len < DHCP_SNAME_OFS) {
tax	0:66300c77c6e9	1319	return ERR_BUF;
tax	0:66300c77c6e9	1320	}
tax	0:66300c77c6e9	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
tax	0:66300c77c6e9	1322	#if LWIP_DHCP_BOOTP_FILE
tax	0:66300c77c6e9	1323	/* clear boot file name */
tax	0:66300c77c6e9	1324	dhcp->boot_file_name[0] = 0;
tax	0:66300c77c6e9	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
tax	0:66300c77c6e9	1326
tax	0:66300c77c6e9	1327	/* parse options */
tax	0:66300c77c6e9	1328
tax	0:66300c77c6e9	1329	/* start with options field */
tax	0:66300c77c6e9	1330	options_idx = DHCP_OPTIONS_OFS;
tax	0:66300c77c6e9	1331	/* parse options to the end of the received packet */
tax	0:66300c77c6e9	1332	options_idx_max = p->tot_len;
tax	0:66300c77c6e9	1333	again:
tax	0:66300c77c6e9	1334	q = p;
tax	0:66300c77c6e9	1335	while((q != NULL) && (options_idx >= q->len)) {
tax	0:66300c77c6e9	1336	options_idx -= q->len;
tax	0:66300c77c6e9	1337	options_idx_max -= q->len;
tax	0:66300c77c6e9	1338	q = q->next;
tax	0:66300c77c6e9	1339	}
tax	0:66300c77c6e9	1340	if (q == NULL) {
tax	0:66300c77c6e9	1341	return ERR_BUF;
tax	0:66300c77c6e9	1342	}
tax	0:66300c77c6e9	1343	offset = options_idx;
tax	0:66300c77c6e9	1344	offset_max = options_idx_max;
tax	0:66300c77c6e9	1345	options = (u8_t*)q->payload;
tax	0:66300c77c6e9	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
tax	0:66300c77c6e9	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
tax	0:66300c77c6e9	1348	u8_t op = options[offset];
tax	0:66300c77c6e9	1349	u8_t len;
tax	0:66300c77c6e9	1350	u8_t decode_len = 0;
tax	0:66300c77c6e9	1351	int decode_idx = -1;
tax	0:66300c77c6e9	1352	u16_t val_offset = offset + 2;
tax	0:66300c77c6e9	1353	/* len byte might be in the next pbuf */
tax	0:66300c77c6e9	1354	if (offset + 1 < q->len) {
tax	0:66300c77c6e9	1355	len = options[offset + 1];
tax	0:66300c77c6e9	1356	} else {
tax	0:66300c77c6e9	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
tax	0:66300c77c6e9	1358	}
tax	0:66300c77c6e9	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
tax	0:66300c77c6e9	1360	decode_len = len;
tax	0:66300c77c6e9	1361	switch(op) {
tax	0:66300c77c6e9	1362	/* case(DHCP_OPTION_END): handled above */
tax	0:66300c77c6e9	1363	case(DHCP_OPTION_PAD):
tax	0:66300c77c6e9	1364	/* special option: no len encoded */
tax	0:66300c77c6e9	1365	decode_len = len = 0;
tax	0:66300c77c6e9	1366	/* will be increased below */
tax	0:66300c77c6e9	1367	offset--;
tax	0:66300c77c6e9	1368	break;
tax	0:66300c77c6e9	1369	case(DHCP_OPTION_SUBNET_MASK):
tax	0:66300c77c6e9	1370	LWIP_ASSERT("len == 4", len == 4);
tax	0:66300c77c6e9	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
tax	0:66300c77c6e9	1372	break;
tax	0:66300c77c6e9	1373	case(DHCP_OPTION_ROUTER):
tax	0:66300c77c6e9	1374	decode_len = 4; /* only copy the first given router */
tax	0:66300c77c6e9	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
tax	0:66300c77c6e9	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
tax	0:66300c77c6e9	1377	break;
tax	0:66300c77c6e9	1378	case(DHCP_OPTION_DNS_SERVER):
tax	0:66300c77c6e9	1379	/* special case: there might be more than one server */
tax	0:66300c77c6e9	1380	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
tax	0:66300c77c6e9	1381	/* limit number of DNS servers */
tax	0:66300c77c6e9	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
tax	0:66300c77c6e9	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
tax	0:66300c77c6e9	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
tax	0:66300c77c6e9	1385	break;
tax	0:66300c77c6e9	1386	case(DHCP_OPTION_LEASE_TIME):
tax	0:66300c77c6e9	1387	LWIP_ASSERT("len == 4", len == 4);
tax	0:66300c77c6e9	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
tax	0:66300c77c6e9	1389	break;
tax	0:66300c77c6e9	1390	case(DHCP_OPTION_OVERLOAD):
tax	0:66300c77c6e9	1391	LWIP_ASSERT("len == 1", len == 1);
tax	0:66300c77c6e9	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
tax	0:66300c77c6e9	1393	break;
tax	0:66300c77c6e9	1394	case(DHCP_OPTION_MESSAGE_TYPE):
tax	0:66300c77c6e9	1395	LWIP_ASSERT("len == 1", len == 1);
tax	0:66300c77c6e9	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
tax	0:66300c77c6e9	1397	break;
tax	0:66300c77c6e9	1398	case(DHCP_OPTION_SERVER_ID):
tax	0:66300c77c6e9	1399	LWIP_ASSERT("len == 4", len == 4);
tax	0:66300c77c6e9	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
tax	0:66300c77c6e9	1401	break;
tax	0:66300c77c6e9	1402	case(DHCP_OPTION_T1):
tax	0:66300c77c6e9	1403	LWIP_ASSERT("len == 4", len == 4);
tax	0:66300c77c6e9	1404	decode_idx = DHCP_OPTION_IDX_T1;
tax	0:66300c77c6e9	1405	break;
tax	0:66300c77c6e9	1406	case(DHCP_OPTION_T2):
tax	0:66300c77c6e9	1407	LWIP_ASSERT("len == 4", len == 4);
tax	0:66300c77c6e9	1408	decode_idx = DHCP_OPTION_IDX_T2;
tax	0:66300c77c6e9	1409	break;
tax	0:66300c77c6e9	1410	default:
tax	0:66300c77c6e9	1411	decode_len = 0;
tax	0:66300c77c6e9	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
tax	0:66300c77c6e9	1413	break;
tax	0:66300c77c6e9	1414	}
tax	0:66300c77c6e9	1415	offset += len + 2;
tax	0:66300c77c6e9	1416	if (decode_len > 0) {
tax	0:66300c77c6e9	1417	u32_t value = 0;
tax	0:66300c77c6e9	1418	u16_t copy_len;
tax	0:66300c77c6e9	1419	decode_next:
tax	0:66300c77c6e9	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
tax	0:66300c77c6e9	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
tax	0:66300c77c6e9	1422	copy_len = LWIP_MIN(decode_len, 4);
tax	0:66300c77c6e9	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
tax	0:66300c77c6e9	1424	if (decode_len > 4) {
tax	0:66300c77c6e9	1425	/* decode more than one u32_t */
tax	0:66300c77c6e9	1426	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
tax	0:66300c77c6e9	1427	dhcp_got_option(dhcp, decode_idx);
tax	0:66300c77c6e9	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
tax	0:66300c77c6e9	1429	decode_len -= 4;
tax	0:66300c77c6e9	1430	val_offset += 4;
tax	0:66300c77c6e9	1431	decode_idx++;
tax	0:66300c77c6e9	1432	goto decode_next;
tax	0:66300c77c6e9	1433	} else if (decode_len == 4) {
tax	0:66300c77c6e9	1434	value = ntohl(value);
tax	0:66300c77c6e9	1435	} else {
tax	0:66300c77c6e9	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
tax	0:66300c77c6e9	1437	value = ((u8_t*)&value)[0];
tax	0:66300c77c6e9	1438	}
tax	0:66300c77c6e9	1439	dhcp_got_option(dhcp, decode_idx);
tax	0:66300c77c6e9	1440	dhcp_set_option_value(dhcp, decode_idx, value);
tax	0:66300c77c6e9	1441	}
tax	0:66300c77c6e9	1442	if (offset >= q->len) {
tax	0:66300c77c6e9	1443	offset -= q->len;
tax	0:66300c77c6e9	1444	offset_max -= q->len;
tax	0:66300c77c6e9	1445	q = q->next;
tax	0:66300c77c6e9	1446	options = (u8_t*)q->payload;
tax	0:66300c77c6e9	1447	}
tax	0:66300c77c6e9	1448	}
tax	0:66300c77c6e9	1449	/* is this an overloaded message? */
tax	0:66300c77c6e9	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
tax	0:66300c77c6e9	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
tax	0:66300c77c6e9	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
tax	0:66300c77c6e9	1453	if (overload == DHCP_OVERLOAD_FILE) {
tax	0:66300c77c6e9	1454	parse_file_as_options = 1;
tax	0:66300c77c6e9	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
tax	0:66300c77c6e9	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
tax	0:66300c77c6e9	1457	parse_sname_as_options = 1;
tax	0:66300c77c6e9	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
tax	0:66300c77c6e9	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
tax	0:66300c77c6e9	1460	parse_sname_as_options = 1;
tax	0:66300c77c6e9	1461	parse_file_as_options = 1;
tax	0:66300c77c6e9	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
tax	0:66300c77c6e9	1463	} else {
tax	0:66300c77c6e9	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
tax	0:66300c77c6e9	1465	}
tax	0:66300c77c6e9	1466	#if LWIP_DHCP_BOOTP_FILE
tax	0:66300c77c6e9	1467	if (!parse_file_as_options) {
tax	0:66300c77c6e9	1468	/* only do this for ACK messages */
tax	0:66300c77c6e9	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
tax	0:66300c77c6e9	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
tax	0:66300c77c6e9	1471	/* copy bootp file name, don't care for sname (server hostname) */
tax	0:66300c77c6e9	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
tax	0:66300c77c6e9	1473	/* make sure the string is really NULL-terminated */
tax	0:66300c77c6e9	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
tax	0:66300c77c6e9	1475	}
tax	0:66300c77c6e9	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
tax	0:66300c77c6e9	1477	}
tax	0:66300c77c6e9	1478	if (parse_file_as_options) {
tax	0:66300c77c6e9	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
tax	0:66300c77c6e9	1480	parse_file_as_options = 0;
tax	0:66300c77c6e9	1481	options_idx = DHCP_FILE_OFS;
tax	0:66300c77c6e9	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
tax	0:66300c77c6e9	1483	goto again;
tax	0:66300c77c6e9	1484	} else if (parse_sname_as_options) {
tax	0:66300c77c6e9	1485	parse_sname_as_options = 0;
tax	0:66300c77c6e9	1486	options_idx = DHCP_SNAME_OFS;
tax	0:66300c77c6e9	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
tax	0:66300c77c6e9	1488	goto again;
tax	0:66300c77c6e9	1489	}
tax	0:66300c77c6e9	1490	return ERR_OK;
tax	0:66300c77c6e9	1491	}
tax	0:66300c77c6e9	1492
tax	0:66300c77c6e9	1493	/**
tax	0:66300c77c6e9	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
tax	0:66300c77c6e9	1495	*/
tax	0:66300c77c6e9	1496	static void
tax	0:66300c77c6e9	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
tax	0:66300c77c6e9	1498	{
tax	0:66300c77c6e9	1499	struct netif netif = (struct netif )arg;
tax	0:66300c77c6e9	1500	struct dhcp *dhcp = netif->dhcp;
tax	0:66300c77c6e9	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
tax	0:66300c77c6e9	1502	u8_t msg_type;
tax	0:66300c77c6e9	1503	u8_t i;
tax	0:66300c77c6e9	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,
tax	0:66300c77c6e9	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
tax	0:66300c77c6e9	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
tax	0:66300c77c6e9	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
tax	0:66300c77c6e9	1508	/* prevent warnings about unused arguments */
tax	0:66300c77c6e9	1509	LWIP_UNUSED_ARG(pcb);
tax	0:66300c77c6e9	1510	LWIP_UNUSED_ARG(addr);
tax	0:66300c77c6e9	1511	LWIP_UNUSED_ARG(port);
tax	0:66300c77c6e9	1512
tax	0:66300c77c6e9	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
tax	0:66300c77c6e9	1514
tax	0:66300c77c6e9	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
tax	0:66300c77c6e9	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
tax	0:66300c77c6e9	1517	goto free_pbuf_and_return;
tax	0:66300c77c6e9	1518	}
tax	0:66300c77c6e9	1519
tax	0:66300c77c6e9	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	1522	goto free_pbuf_and_return;
tax	0:66300c77c6e9	1523	}
tax	0:66300c77c6e9	1524	/* iterate through hardware address and match against DHCP message */
tax	0:66300c77c6e9	1525	for (i = 0; i < netif->hwaddr_len; i++) {
tax	0:66300c77c6e9	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
tax	0:66300c77c6e9	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
tax	0:66300c77c6e9	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
tax	0:66300c77c6e9	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
tax	0:66300c77c6e9	1530	goto free_pbuf_and_return;
tax	0:66300c77c6e9	1531	}
tax	0:66300c77c6e9	1532	}
tax	0:66300c77c6e9	1533	/* match transaction ID against what we expected */
tax	0:66300c77c6e9	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
tax	0:66300c77c6e9	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
tax	0:66300c77c6e9	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
tax	0:66300c77c6e9	1537	goto free_pbuf_and_return;
tax	0:66300c77c6e9	1538	}
tax	0:66300c77c6e9	1539	/* option fields could be unfold? */
tax	0:66300c77c6e9	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
tax	0:66300c77c6e9	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	1542	("problem unfolding DHCP message - too short on memory?\n"));
tax	0:66300c77c6e9	1543	goto free_pbuf_and_return;
tax	0:66300c77c6e9	1544	}
tax	0:66300c77c6e9	1545
tax	0:66300c77c6e9	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
tax	0:66300c77c6e9	1547	/* obtain pointer to DHCP message type */
tax	0:66300c77c6e9	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
tax	0:66300c77c6e9	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
tax	0:66300c77c6e9	1550	goto free_pbuf_and_return;
tax	0:66300c77c6e9	1551	}
tax	0:66300c77c6e9	1552
tax	0:66300c77c6e9	1553	/* read DHCP message type */
tax	0:66300c77c6e9	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
tax	0:66300c77c6e9	1555	/* message type is DHCP ACK? */
tax	0:66300c77c6e9	1556	if (msg_type == DHCP_ACK) {
tax	0:66300c77c6e9	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
tax	0:66300c77c6e9	1558	/* in requesting state? */
tax	0:66300c77c6e9	1559	if (dhcp->state == DHCP_REQUESTING) {
tax	0:66300c77c6e9	1560	dhcp_handle_ack(netif);
tax	0:66300c77c6e9	1561	#if DHCP_DOES_ARP_CHECK
tax	0:66300c77c6e9	1562	/* check if the acknowledged lease address is already in use */
tax	0:66300c77c6e9	1563	dhcp_check(netif);
tax	0:66300c77c6e9	1564	#else
tax	0:66300c77c6e9	1565	/* bind interface to the acknowledged lease address */
tax	0:66300c77c6e9	1566	dhcp_bind(netif);
tax	0:66300c77c6e9	1567	#endif
tax	0:66300c77c6e9	1568	}
tax	0:66300c77c6e9	1569	/* already bound to the given lease address? */
tax	0:66300c77c6e9	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
tax	0:66300c77c6e9	1571	dhcp_bind(netif);
tax	0:66300c77c6e9	1572	}
tax	0:66300c77c6e9	1573	}
tax	0:66300c77c6e9	1574	/* received a DHCP_NAK in appropriate state? */
tax	0:66300c77c6e9	1575	else if ((msg_type == DHCP_NAK) &&
tax	0:66300c77c6e9	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
tax	0:66300c77c6e9	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
tax	0:66300c77c6e9	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
tax	0:66300c77c6e9	1579	dhcp_handle_nak(netif);
tax	0:66300c77c6e9	1580	}
tax	0:66300c77c6e9	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
tax	0:66300c77c6e9	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
tax	0:66300c77c6e9	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
tax	0:66300c77c6e9	1584	dhcp->request_timeout = 0;
tax	0:66300c77c6e9	1585	/* remember offered lease */
tax	0:66300c77c6e9	1586	dhcp_handle_offer(netif);
tax	0:66300c77c6e9	1587	}
tax	0:66300c77c6e9	1588	free_pbuf_and_return:
tax	0:66300c77c6e9	1589	dhcp->msg_in = NULL;
tax	0:66300c77c6e9	1590	pbuf_free(p);
tax	0:66300c77c6e9	1591	}
tax	0:66300c77c6e9	1592
tax	0:66300c77c6e9	1593	/**
tax	0:66300c77c6e9	1594	* Create a DHCP request, fill in common headers
tax	0:66300c77c6e9	1595	*
tax	0:66300c77c6e9	1596	* @param netif the netif under DHCP control
tax	0:66300c77c6e9	1597	* @param dhcp dhcp control struct
tax	0:66300c77c6e9	1598	* @param message_type message type of the request
tax	0:66300c77c6e9	1599	*/
tax	0:66300c77c6e9	1600	static err_t
tax	0:66300c77c6e9	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
tax	0:66300c77c6e9	1602	{
tax	0:66300c77c6e9	1603	u16_t i;
tax	0:66300c77c6e9	1604	#ifndef DHCP_GLOBAL_XID
tax	0:66300c77c6e9	1605	/** default global transaction identifier starting value (easy to match
tax	0:66300c77c6e9	1606	* with a packet analyser). We simply increment for each new request.
tax	0:66300c77c6e9	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
tax	0:66300c77c6e9	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
tax	0:66300c77c6e9	1609	static u32_t xid = 0xABCD0000;
tax	0:66300c77c6e9	1610	#else
tax	0:66300c77c6e9	1611	static u32_t xid;
tax	0:66300c77c6e9	1612	static u8_t xid_initialised = 0;
tax	0:66300c77c6e9	1613	if (!xid_initialised) {
tax	0:66300c77c6e9	1614	xid = DHCP_GLOBAL_XID;
tax	0:66300c77c6e9	1615	xid_initialised = !xid_initialised;
tax	0:66300c77c6e9	1616	}
tax	0:66300c77c6e9	1617	#endif
tax	0:66300c77c6e9	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
tax	0:66300c77c6e9	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
tax	0:66300c77c6e9	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
tax	0:66300c77c6e9	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
tax	0:66300c77c6e9	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
tax	0:66300c77c6e9	1623	if (dhcp->p_out == NULL) {
tax	0:66300c77c6e9	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
tax	0:66300c77c6e9	1626	return ERR_MEM;
tax	0:66300c77c6e9	1627	}
tax	0:66300c77c6e9	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
tax	0:66300c77c6e9	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
tax	0:66300c77c6e9	1630
tax	0:66300c77c6e9	1631	/* reuse transaction identifier in retransmissions */
tax	0:66300c77c6e9	1632	if (dhcp->tries == 0) {
tax	0:66300c77c6e9	1633	xid++;
tax	0:66300c77c6e9	1634	}
tax	0:66300c77c6e9	1635	dhcp->xid = xid;
tax	0:66300c77c6e9	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	1637	("transaction id xid(%"X32_F")\n", xid));
tax	0:66300c77c6e9	1638
tax	0:66300c77c6e9	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
tax	0:66300c77c6e9	1640
tax	0:66300c77c6e9	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
tax	0:66300c77c6e9	1642	/* TODO: make link layer independent */
tax	0:66300c77c6e9	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
tax	0:66300c77c6e9	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
tax	0:66300c77c6e9	1645	dhcp->msg_out->hops = 0;
tax	0:66300c77c6e9	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
tax	0:66300c77c6e9	1647	dhcp->msg_out->secs = 0;
tax	0:66300c77c6e9	1648	/* we don't need the broadcast flag since we can receive unicast traffic
tax	0:66300c77c6e9	1649	before being fully configured! */
tax	0:66300c77c6e9	1650	dhcp->msg_out->flags = 0;
tax	0:66300c77c6e9	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
tax	0:66300c77c6e9	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
tax	0:66300c77c6e9	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
tax	0:66300c77c6e9	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
tax	0:66300c77c6e9	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
tax	0:66300c77c6e9	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
tax	0:66300c77c6e9	1657	}
tax	0:66300c77c6e9	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
tax	0:66300c77c6e9	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
tax	0:66300c77c6e9	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
tax	0:66300c77c6e9	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
tax	0:66300c77c6e9	1662	/* copy netif hardware address, pad with zeroes */
tax	0:66300c77c6e9	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
tax	0:66300c77c6e9	1664	}
tax	0:66300c77c6e9	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
tax	0:66300c77c6e9	1666	dhcp->msg_out->sname[i] = 0;
tax	0:66300c77c6e9	1667	}
tax	0:66300c77c6e9	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
tax	0:66300c77c6e9	1669	dhcp->msg_out->file[i] = 0;
tax	0:66300c77c6e9	1670	}
tax	0:66300c77c6e9	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
tax	0:66300c77c6e9	1672	dhcp->options_out_len = 0;
tax	0:66300c77c6e9	1673	/* fill options field with an incrementing array (for debugging purposes) */
tax	0:66300c77c6e9	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
tax	0:66300c77c6e9	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
tax	0:66300c77c6e9	1676	}
tax	0:66300c77c6e9	1677	/* Add option MESSAGE_TYPE */
tax	0:66300c77c6e9	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
tax	0:66300c77c6e9	1679	dhcp_option_byte(dhcp, message_type);
tax	0:66300c77c6e9	1680	return ERR_OK;
tax	0:66300c77c6e9	1681	}
tax	0:66300c77c6e9	1682
tax	0:66300c77c6e9	1683	/**
tax	0:66300c77c6e9	1684	* Free previously allocated memory used to send a DHCP request.
tax	0:66300c77c6e9	1685	*
tax	0:66300c77c6e9	1686	* @param dhcp the dhcp struct to free the request from
tax	0:66300c77c6e9	1687	*/
tax	0:66300c77c6e9	1688	static void
tax	0:66300c77c6e9	1689	dhcp_delete_msg(struct dhcp *dhcp)
tax	0:66300c77c6e9	1690	{
tax	0:66300c77c6e9	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
tax	0:66300c77c6e9	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
tax	0:66300c77c6e9	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
tax	0:66300c77c6e9	1694	if (dhcp->p_out != NULL) {
tax	0:66300c77c6e9	1695	pbuf_free(dhcp->p_out);
tax	0:66300c77c6e9	1696	}
tax	0:66300c77c6e9	1697	dhcp->p_out = NULL;
tax	0:66300c77c6e9	1698	dhcp->msg_out = NULL;
tax	0:66300c77c6e9	1699	}
tax	0:66300c77c6e9	1700
tax	0:66300c77c6e9	1701	/**
tax	0:66300c77c6e9	1702	* Add a DHCP message trailer
tax	0:66300c77c6e9	1703	*
tax	0:66300c77c6e9	1704	* Adds the END option to the DHCP message, and if
tax	0:66300c77c6e9	1705	* necessary, up to three padding bytes.
tax	0:66300c77c6e9	1706	*
tax	0:66300c77c6e9	1707	* @param dhcp DHCP state structure
tax	0:66300c77c6e9	1708	*/
tax	0:66300c77c6e9	1709	static void
tax	0:66300c77c6e9	1710	dhcp_option_trailer(struct dhcp *dhcp)
tax	0:66300c77c6e9	1711	{
tax	0:66300c77c6e9	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
tax	0:66300c77c6e9	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
tax	0:66300c77c6e9	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
tax	0:66300c77c6e9	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
tax	0:66300c77c6e9	1716	/* packet is too small, or not 4 byte aligned? */
tax	0:66300c77c6e9	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
tax	0:66300c77c6e9	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)); */
tax	0:66300c77c6e9	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
tax	0:66300c77c6e9	1720	/* add a fill/padding byte */
tax	0:66300c77c6e9	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
tax	0:66300c77c6e9	1722	}
tax	0:66300c77c6e9	1723	}
tax	0:66300c77c6e9	1724
tax	0:66300c77c6e9	1725	#endif /* LWIP_DHCP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/core/dhcp.c@0:66300c77c6e9, 2011-03-29 (annotated)

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