NetServicesMod - Modified version of NetServices. Fixes an issue w…

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Modified version of NetServices. Fixes an issue where connections failed should the HTTP response status line be received in a packet on its own prior to any further headers. Changes are made to the HTTPClient.cpp file's readHeaders method.

lwip/core/dhcp.c@0:ec559500a63f, 2011-04-08 (annotated)

Committer:: andrewbonney
Date:: Fri Apr 08 14:39:41 2011 +0000
Revision:: 0:ec559500a63f

Who changed what in which revision?

User	Revision	Line number	New contents of line
andrewbonney	0:ec559500a63f	1	/**
andrewbonney	0:ec559500a63f	2	* @file
andrewbonney	0:ec559500a63f	3	* Dynamic Host Configuration Protocol client
andrewbonney	0:ec559500a63f	4	*
andrewbonney	0:ec559500a63f	5	*/
andrewbonney	0:ec559500a63f	6
andrewbonney	0:ec559500a63f	7	/*
andrewbonney	0:ec559500a63f	8	*
andrewbonney	0:ec559500a63f	9	* Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
andrewbonney	0:ec559500a63f	10	* Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
andrewbonney	0:ec559500a63f	11	* All rights reserved.
andrewbonney	0:ec559500a63f	12	*
andrewbonney	0:ec559500a63f	13	* Redistribution and use in source and binary forms, with or without modification,
andrewbonney	0:ec559500a63f	14	* are permitted provided that the following conditions are met:
andrewbonney	0:ec559500a63f	15	*
andrewbonney	0:ec559500a63f	16	* 1. Redistributions of source code must retain the above copyright notice,
andrewbonney	0:ec559500a63f	17	* this list of conditions and the following disclaimer.
andrewbonney	0:ec559500a63f	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
andrewbonney	0:ec559500a63f	19	* this list of conditions and the following disclaimer in the documentation
andrewbonney	0:ec559500a63f	20	* and/or other materials provided with the distribution.
andrewbonney	0:ec559500a63f	21	* 3. The name of the author may not be used to endorse or promote products
andrewbonney	0:ec559500a63f	22	* derived from this software without specific prior written permission.
andrewbonney	0:ec559500a63f	23	*
andrewbonney	0:ec559500a63f	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
andrewbonney	0:ec559500a63f	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
andrewbonney	0:ec559500a63f	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
andrewbonney	0:ec559500a63f	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
andrewbonney	0:ec559500a63f	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
andrewbonney	0:ec559500a63f	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
andrewbonney	0:ec559500a63f	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
andrewbonney	0:ec559500a63f	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
andrewbonney	0:ec559500a63f	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
andrewbonney	0:ec559500a63f	33	* OF SUCH DAMAGE.
andrewbonney	0:ec559500a63f	34	*
andrewbonney	0:ec559500a63f	35	* This file is a contribution to the lwIP TCP/IP stack.
andrewbonney	0:ec559500a63f	36	* The Swedish Institute of Computer Science and Adam Dunkels
andrewbonney	0:ec559500a63f	37	* are specifically granted permission to redistribute this
andrewbonney	0:ec559500a63f	38	* source code.
andrewbonney	0:ec559500a63f	39	*
andrewbonney	0:ec559500a63f	40	* Author: Leon Woestenberg <leon.woestenberg@gmx.net>
andrewbonney	0:ec559500a63f	41	*
andrewbonney	0:ec559500a63f	42	* This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
andrewbonney	0:ec559500a63f	43	* with RFC 2131 and RFC 2132.
andrewbonney	0:ec559500a63f	44	*
andrewbonney	0:ec559500a63f	45	* TODO:
andrewbonney	0:ec559500a63f	46	* - Support for interfaces other than Ethernet (SLIP, PPP, ...)
andrewbonney	0:ec559500a63f	47	*
andrewbonney	0:ec559500a63f	48	* Please coordinate changes and requests with Leon Woestenberg
andrewbonney	0:ec559500a63f	49	* <leon.woestenberg@gmx.net>
andrewbonney	0:ec559500a63f	50	*
andrewbonney	0:ec559500a63f	51	* Integration with your code:
andrewbonney	0:ec559500a63f	52	*
andrewbonney	0:ec559500a63f	53	* In lwip/dhcp.h
andrewbonney	0:ec559500a63f	54	* #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
andrewbonney	0:ec559500a63f	55	* #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
andrewbonney	0:ec559500a63f	56	*
andrewbonney	0:ec559500a63f	57	* Then have your application call dhcp_coarse_tmr() and
andrewbonney	0:ec559500a63f	58	* dhcp_fine_tmr() on the defined intervals.
andrewbonney	0:ec559500a63f	59	*
andrewbonney	0:ec559500a63f	60	* dhcp_start(struct netif *netif);
andrewbonney	0:ec559500a63f	61	* starts a DHCP client instance which configures the interface by
andrewbonney	0:ec559500a63f	62	* obtaining an IP address lease and maintaining it.
andrewbonney	0:ec559500a63f	63	*
andrewbonney	0:ec559500a63f	64	* Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
andrewbonney	0:ec559500a63f	65	* to remove the DHCP client.
andrewbonney	0:ec559500a63f	66	*
andrewbonney	0:ec559500a63f	67	*/
andrewbonney	0:ec559500a63f	68
andrewbonney	0:ec559500a63f	69	#include "lwip/opt.h"
andrewbonney	0:ec559500a63f	70
andrewbonney	0:ec559500a63f	71	#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
andrewbonney	0:ec559500a63f	72
andrewbonney	0:ec559500a63f	73	#include "lwip/stats.h"
andrewbonney	0:ec559500a63f	74	#include "lwip/mem.h"
andrewbonney	0:ec559500a63f	75	#include "lwip/udp.h"
andrewbonney	0:ec559500a63f	76	#include "lwip/ip_addr.h"
andrewbonney	0:ec559500a63f	77	#include "lwip/netif.h"
andrewbonney	0:ec559500a63f	78	#include "lwip/def.h"
andrewbonney	0:ec559500a63f	79	#include "lwip/sys.h"
andrewbonney	0:ec559500a63f	80	#include "lwip/dhcp.h"
andrewbonney	0:ec559500a63f	81	#include "lwip/autoip.h"
andrewbonney	0:ec559500a63f	82	#include "lwip/dns.h"
andrewbonney	0:ec559500a63f	83	#include "netif/etharp.h"
andrewbonney	0:ec559500a63f	84
andrewbonney	0:ec559500a63f	85	#include <string.h>
andrewbonney	0:ec559500a63f	86
andrewbonney	0:ec559500a63f	87	/** Default for DHCP_GLOBAL_XID is 0xABCD0000
andrewbonney	0:ec559500a63f	88	* This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
andrewbonney	0:ec559500a63f	89	* #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
andrewbonney	0:ec559500a63f	90	* #define DHCP_GLOBAL_XID rand()
andrewbonney	0:ec559500a63f	91	*/
andrewbonney	0:ec559500a63f	92	#ifdef DHCP_GLOBAL_XID_HEADER
andrewbonney	0:ec559500a63f	93	#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
andrewbonney	0:ec559500a63f	94	#endif
andrewbonney	0:ec559500a63f	95
andrewbonney	0:ec559500a63f	96	/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
andrewbonney	0:ec559500a63f	97	* MTU is checked to be big enough in dhcp_start */
andrewbonney	0:ec559500a63f	98	#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
andrewbonney	0:ec559500a63f	99	#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
andrewbonney	0:ec559500a63f	100	/** Minimum length for reply before packet is parsed */
andrewbonney	0:ec559500a63f	101	#define DHCP_MIN_REPLY_LEN 44
andrewbonney	0:ec559500a63f	102
andrewbonney	0:ec559500a63f	103	#define REBOOT_TRIES 2
andrewbonney	0:ec559500a63f	104
andrewbonney	0:ec559500a63f	105	/** Option handling: options are parsed in dhcp_parse_reply
andrewbonney	0:ec559500a63f	106	* and saved in an array where other functions can load them from.
andrewbonney	0:ec559500a63f	107	* This might be moved into the struct dhcp (not necessarily since
andrewbonney	0:ec559500a63f	108	* lwIP is single-threaded and the array is only used while in recv
andrewbonney	0:ec559500a63f	109	* callback). */
andrewbonney	0:ec559500a63f	110	#define DHCP_OPTION_IDX_OVERLOAD 0
andrewbonney	0:ec559500a63f	111	#define DHCP_OPTION_IDX_MSG_TYPE 1
andrewbonney	0:ec559500a63f	112	#define DHCP_OPTION_IDX_SERVER_ID 2
andrewbonney	0:ec559500a63f	113	#define DHCP_OPTION_IDX_LEASE_TIME 3
andrewbonney	0:ec559500a63f	114	#define DHCP_OPTION_IDX_T1 4
andrewbonney	0:ec559500a63f	115	#define DHCP_OPTION_IDX_T2 5
andrewbonney	0:ec559500a63f	116	#define DHCP_OPTION_IDX_SUBNET_MASK 6
andrewbonney	0:ec559500a63f	117	#define DHCP_OPTION_IDX_ROUTER 7
andrewbonney	0:ec559500a63f	118	#define DHCP_OPTION_IDX_DNS_SERVER 8
andrewbonney	0:ec559500a63f	119	#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
andrewbonney	0:ec559500a63f	120
andrewbonney	0:ec559500a63f	121	/** Holds the decoded option values, only valid while in dhcp_recv.
andrewbonney	0:ec559500a63f	122	@todo: move this into struct dhcp? */
andrewbonney	0:ec559500a63f	123	u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
andrewbonney	0:ec559500a63f	124	/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
andrewbonney	0:ec559500a63f	125	only valid while in dhcp_recv.
andrewbonney	0:ec559500a63f	126	@todo: move this into struct dhcp? */
andrewbonney	0:ec559500a63f	127	u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
andrewbonney	0:ec559500a63f	128
andrewbonney	0:ec559500a63f	129	#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
andrewbonney	0:ec559500a63f	130	#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
andrewbonney	0:ec559500a63f	131	#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
andrewbonney	0:ec559500a63f	132	#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
andrewbonney	0:ec559500a63f	133	#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
andrewbonney	0:ec559500a63f	134	#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
andrewbonney	0:ec559500a63f	135
andrewbonney	0:ec559500a63f	136
andrewbonney	0:ec559500a63f	137	/* DHCP client state machine functions */
andrewbonney	0:ec559500a63f	138	static err_t dhcp_discover(struct netif *netif);
andrewbonney	0:ec559500a63f	139	static err_t dhcp_select(struct netif *netif);
andrewbonney	0:ec559500a63f	140	static void dhcp_bind(struct netif *netif);
andrewbonney	0:ec559500a63f	141	#if DHCP_DOES_ARP_CHECK
andrewbonney	0:ec559500a63f	142	static err_t dhcp_decline(struct netif *netif);
andrewbonney	0:ec559500a63f	143	#endif /* DHCP_DOES_ARP_CHECK */
andrewbonney	0:ec559500a63f	144	static err_t dhcp_rebind(struct netif *netif);
andrewbonney	0:ec559500a63f	145	static err_t dhcp_reboot(struct netif *netif);
andrewbonney	0:ec559500a63f	146	static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
andrewbonney	0:ec559500a63f	147
andrewbonney	0:ec559500a63f	148	/* receive, unfold, parse and free incoming messages */
andrewbonney	0:ec559500a63f	149	static void dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port);
andrewbonney	0:ec559500a63f	150
andrewbonney	0:ec559500a63f	151	/* set the DHCP timers */
andrewbonney	0:ec559500a63f	152	static void dhcp_timeout(struct netif *netif);
andrewbonney	0:ec559500a63f	153	static void dhcp_t1_timeout(struct netif *netif);
andrewbonney	0:ec559500a63f	154	static void dhcp_t2_timeout(struct netif *netif);
andrewbonney	0:ec559500a63f	155
andrewbonney	0:ec559500a63f	156	/* build outgoing messages */
andrewbonney	0:ec559500a63f	157	/* create a DHCP message, fill in common headers */
andrewbonney	0:ec559500a63f	158	static err_t dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type);
andrewbonney	0:ec559500a63f	159	/* free a DHCP request */
andrewbonney	0:ec559500a63f	160	static void dhcp_delete_msg(struct dhcp *dhcp);
andrewbonney	0:ec559500a63f	161	/* add a DHCP option (type, then length in bytes) */
andrewbonney	0:ec559500a63f	162	static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
andrewbonney	0:ec559500a63f	163	/* add option values */
andrewbonney	0:ec559500a63f	164	static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
andrewbonney	0:ec559500a63f	165	static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
andrewbonney	0:ec559500a63f	166	static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
andrewbonney	0:ec559500a63f	167	/* always add the DHCP options trailer to end and pad */
andrewbonney	0:ec559500a63f	168	static void dhcp_option_trailer(struct dhcp *dhcp);
andrewbonney	0:ec559500a63f	169
andrewbonney	0:ec559500a63f	170	/**
andrewbonney	0:ec559500a63f	171	* Back-off the DHCP client (because of a received NAK response).
andrewbonney	0:ec559500a63f	172	*
andrewbonney	0:ec559500a63f	173	* Back-off the DHCP client because of a received NAK. Receiving a
andrewbonney	0:ec559500a63f	174	* NAK means the client asked for something non-sensible, for
andrewbonney	0:ec559500a63f	175	* example when it tries to renew a lease obtained on another network.
andrewbonney	0:ec559500a63f	176	*
andrewbonney	0:ec559500a63f	177	* We clear any existing set IP address and restart DHCP negotiation
andrewbonney	0:ec559500a63f	178	* afresh (as per RFC2131 3.2.3).
andrewbonney	0:ec559500a63f	179	*
andrewbonney	0:ec559500a63f	180	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	181	*/
andrewbonney	0:ec559500a63f	182	static void
andrewbonney	0:ec559500a63f	183	dhcp_handle_nak(struct netif *netif)
andrewbonney	0:ec559500a63f	184	{
andrewbonney	0:ec559500a63f	185	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
andrewbonney	0:ec559500a63f	187	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
andrewbonney	0:ec559500a63f	188	/* Set the interface down since the address must no longer be used, as per RFC2131 */
andrewbonney	0:ec559500a63f	189	netif_set_down(netif);
andrewbonney	0:ec559500a63f	190	/* remove IP address from interface */
andrewbonney	0:ec559500a63f	191	netif_set_ipaddr(netif, IP_ADDR_ANY);
andrewbonney	0:ec559500a63f	192	netif_set_gw(netif, IP_ADDR_ANY);
andrewbonney	0:ec559500a63f	193	netif_set_netmask(netif, IP_ADDR_ANY);
andrewbonney	0:ec559500a63f	194	/* Change to a defined state */
andrewbonney	0:ec559500a63f	195	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
andrewbonney	0:ec559500a63f	196	/* We can immediately restart discovery */
andrewbonney	0:ec559500a63f	197	dhcp_discover(netif);
andrewbonney	0:ec559500a63f	198	}
andrewbonney	0:ec559500a63f	199
andrewbonney	0:ec559500a63f	200	#if DHCP_DOES_ARP_CHECK
andrewbonney	0:ec559500a63f	201	/**
andrewbonney	0:ec559500a63f	202	* Checks if the offered IP address is already in use.
andrewbonney	0:ec559500a63f	203	*
andrewbonney	0:ec559500a63f	204	* It does so by sending an ARP request for the offered address and
andrewbonney	0:ec559500a63f	205	* entering CHECKING state. If no ARP reply is received within a small
andrewbonney	0:ec559500a63f	206	* interval, the address is assumed to be free for use by us.
andrewbonney	0:ec559500a63f	207	*
andrewbonney	0:ec559500a63f	208	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	209	*/
andrewbonney	0:ec559500a63f	210	static void
andrewbonney	0:ec559500a63f	211	dhcp_check(struct netif *netif)
andrewbonney	0:ec559500a63f	212	{
andrewbonney	0:ec559500a63f	213	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	214	err_t result;
andrewbonney	0:ec559500a63f	215	u16_t msecs;
andrewbonney	0:ec559500a63f	216	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
andrewbonney	0:ec559500a63f	217	(s16_t)netif->name[1]));
andrewbonney	0:ec559500a63f	218	dhcp_set_state(dhcp, DHCP_CHECKING);
andrewbonney	0:ec559500a63f	219	/* create an ARP query for the offered IP address, expecting that no host
andrewbonney	0:ec559500a63f	220	responds, as the IP address should not be in use. */
andrewbonney	0:ec559500a63f	221	result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
andrewbonney	0:ec559500a63f	222	if (result != ERR_OK) {
andrewbonney	0:ec559500a63f	223	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
andrewbonney	0:ec559500a63f	224	}
andrewbonney	0:ec559500a63f	225	dhcp->tries++;
andrewbonney	0:ec559500a63f	226	msecs = 500;
andrewbonney	0:ec559500a63f	227	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	228	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	229	}
andrewbonney	0:ec559500a63f	230	#endif /* DHCP_DOES_ARP_CHECK */
andrewbonney	0:ec559500a63f	231
andrewbonney	0:ec559500a63f	232	/**
andrewbonney	0:ec559500a63f	233	* Remember the configuration offered by a DHCP server.
andrewbonney	0:ec559500a63f	234	*
andrewbonney	0:ec559500a63f	235	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	236	*/
andrewbonney	0:ec559500a63f	237	static void
andrewbonney	0:ec559500a63f	238	dhcp_handle_offer(struct netif *netif)
andrewbonney	0:ec559500a63f	239	{
andrewbonney	0:ec559500a63f	240	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	241	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
andrewbonney	0:ec559500a63f	242	(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
andrewbonney	0:ec559500a63f	243	/* obtain the server address */
andrewbonney	0:ec559500a63f	244	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
andrewbonney	0:ec559500a63f	245	ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
andrewbonney	0:ec559500a63f	246	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
andrewbonney	0:ec559500a63f	247	ip4_addr_get_u32(&dhcp->server_ip_addr)));
andrewbonney	0:ec559500a63f	248	/* remember offered address */
andrewbonney	0:ec559500a63f	249	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
andrewbonney	0:ec559500a63f	250	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
andrewbonney	0:ec559500a63f	251	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
andrewbonney	0:ec559500a63f	252
andrewbonney	0:ec559500a63f	253	dhcp_select(netif);
andrewbonney	0:ec559500a63f	254	} else {
andrewbonney	0:ec559500a63f	255	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
andrewbonney	0:ec559500a63f	256	("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
andrewbonney	0:ec559500a63f	257	}
andrewbonney	0:ec559500a63f	258	}
andrewbonney	0:ec559500a63f	259
andrewbonney	0:ec559500a63f	260	/**
andrewbonney	0:ec559500a63f	261	* Select a DHCP server offer out of all offers.
andrewbonney	0:ec559500a63f	262	*
andrewbonney	0:ec559500a63f	263	* Simply select the first offer received.
andrewbonney	0:ec559500a63f	264	*
andrewbonney	0:ec559500a63f	265	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	266	* @return lwIP specific error (see error.h)
andrewbonney	0:ec559500a63f	267	*/
andrewbonney	0:ec559500a63f	268	static err_t
andrewbonney	0:ec559500a63f	269	dhcp_select(struct netif *netif)
andrewbonney	0:ec559500a63f	270	{
andrewbonney	0:ec559500a63f	271	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	272	err_t result;
andrewbonney	0:ec559500a63f	273	u16_t msecs;
andrewbonney	0:ec559500a63f	274
andrewbonney	0:ec559500a63f	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));
andrewbonney	0:ec559500a63f	276	dhcp_set_state(dhcp, DHCP_REQUESTING);
andrewbonney	0:ec559500a63f	277
andrewbonney	0:ec559500a63f	278	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	279	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
andrewbonney	0:ec559500a63f	280	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	281	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
andrewbonney	0:ec559500a63f	282	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
andrewbonney	0:ec559500a63f	283
andrewbonney	0:ec559500a63f	284	/* MUST request the offered IP address */
andrewbonney	0:ec559500a63f	285	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
andrewbonney	0:ec559500a63f	286	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
andrewbonney	0:ec559500a63f	287
andrewbonney	0:ec559500a63f	288	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
andrewbonney	0:ec559500a63f	289	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
andrewbonney	0:ec559500a63f	290
andrewbonney	0:ec559500a63f	291	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
andrewbonney	0:ec559500a63f	292	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
andrewbonney	0:ec559500a63f	293	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
andrewbonney	0:ec559500a63f	294	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
andrewbonney	0:ec559500a63f	295	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
andrewbonney	0:ec559500a63f	296
andrewbonney	0:ec559500a63f	297	#if LWIP_NETIF_HOSTNAME
andrewbonney	0:ec559500a63f	298	if (netif->hostname != NULL) {
andrewbonney	0:ec559500a63f	299	const char p = (const char)netif->hostname;
andrewbonney	0:ec559500a63f	300	u8_t namelen = (u8_t)strlen(p);
andrewbonney	0:ec559500a63f	301	if (namelen > 0) {
andrewbonney	0:ec559500a63f	302	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
andrewbonney	0:ec559500a63f	303	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
andrewbonney	0:ec559500a63f	304	while (*p) {
andrewbonney	0:ec559500a63f	305	dhcp_option_byte(dhcp, *p++);
andrewbonney	0:ec559500a63f	306	}
andrewbonney	0:ec559500a63f	307	}
andrewbonney	0:ec559500a63f	308	}
andrewbonney	0:ec559500a63f	309	#endif /* LWIP_NETIF_HOSTNAME */
andrewbonney	0:ec559500a63f	310
andrewbonney	0:ec559500a63f	311	dhcp_option_trailer(dhcp);
andrewbonney	0:ec559500a63f	312	/* shrink the pbuf to the actual content length */
andrewbonney	0:ec559500a63f	313	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
andrewbonney	0:ec559500a63f	314
andrewbonney	0:ec559500a63f	315	/* send broadcast to any DHCP server */
andrewbonney	0:ec559500a63f	316	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	317	dhcp_delete_msg(dhcp);
andrewbonney	0:ec559500a63f	318	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
andrewbonney	0:ec559500a63f	319	} else {
andrewbonney	0:ec559500a63f	320	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	321	}
andrewbonney	0:ec559500a63f	322	dhcp->tries++;
andrewbonney	0:ec559500a63f	323	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
andrewbonney	0:ec559500a63f	324	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	325	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	326	return result;
andrewbonney	0:ec559500a63f	327	}
andrewbonney	0:ec559500a63f	328
andrewbonney	0:ec559500a63f	329	/**
andrewbonney	0:ec559500a63f	330	* The DHCP timer that checks for lease renewal/rebind timeouts.
andrewbonney	0:ec559500a63f	331	*/
andrewbonney	0:ec559500a63f	332	void
andrewbonney	0:ec559500a63f	333	dhcp_coarse_tmr()
andrewbonney	0:ec559500a63f	334	{
andrewbonney	0:ec559500a63f	335	struct netif *netif = netif_list;
andrewbonney	0:ec559500a63f	336	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
andrewbonney	0:ec559500a63f	337	/* iterate through all network interfaces */
andrewbonney	0:ec559500a63f	338	while (netif != NULL) {
andrewbonney	0:ec559500a63f	339	/* only act on DHCP configured interfaces */
andrewbonney	0:ec559500a63f	340	if (netif->dhcp != NULL) {
andrewbonney	0:ec559500a63f	341	/* timer is active (non zero), and triggers (zeroes) now? */
andrewbonney	0:ec559500a63f	342	if (netif->dhcp->t2_timeout-- == 1) {
andrewbonney	0:ec559500a63f	343	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
andrewbonney	0:ec559500a63f	344	/* this clients' rebind timeout triggered */
andrewbonney	0:ec559500a63f	345	dhcp_t2_timeout(netif);
andrewbonney	0:ec559500a63f	346	/* timer is active (non zero), and triggers (zeroes) now */
andrewbonney	0:ec559500a63f	347	} else if (netif->dhcp->t1_timeout-- == 1) {
andrewbonney	0:ec559500a63f	348	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
andrewbonney	0:ec559500a63f	349	/* this clients' renewal timeout triggered */
andrewbonney	0:ec559500a63f	350	dhcp_t1_timeout(netif);
andrewbonney	0:ec559500a63f	351	}
andrewbonney	0:ec559500a63f	352	}
andrewbonney	0:ec559500a63f	353	/* proceed to next netif */
andrewbonney	0:ec559500a63f	354	netif = netif->next;
andrewbonney	0:ec559500a63f	355	}
andrewbonney	0:ec559500a63f	356	}
andrewbonney	0:ec559500a63f	357
andrewbonney	0:ec559500a63f	358	/**
andrewbonney	0:ec559500a63f	359	* DHCP transaction timeout handling
andrewbonney	0:ec559500a63f	360	*
andrewbonney	0:ec559500a63f	361	* A DHCP server is expected to respond within a short period of time.
andrewbonney	0:ec559500a63f	362	* This timer checks whether an outstanding DHCP request is timed out.
andrewbonney	0:ec559500a63f	363	*/
andrewbonney	0:ec559500a63f	364	void
andrewbonney	0:ec559500a63f	365	dhcp_fine_tmr()
andrewbonney	0:ec559500a63f	366	{
andrewbonney	0:ec559500a63f	367	struct netif *netif = netif_list;
andrewbonney	0:ec559500a63f	368	/* loop through netif's */
andrewbonney	0:ec559500a63f	369	while (netif != NULL) {
andrewbonney	0:ec559500a63f	370	/* only act on DHCP configured interfaces */
andrewbonney	0:ec559500a63f	371	if (netif->dhcp != NULL) {
andrewbonney	0:ec559500a63f	372	/* timer is active (non zero), and is about to trigger now */
andrewbonney	0:ec559500a63f	373	if (netif->dhcp->request_timeout > 1) {
andrewbonney	0:ec559500a63f	374	netif->dhcp->request_timeout--;
andrewbonney	0:ec559500a63f	375	}
andrewbonney	0:ec559500a63f	376	else if (netif->dhcp->request_timeout == 1) {
andrewbonney	0:ec559500a63f	377	netif->dhcp->request_timeout--;
andrewbonney	0:ec559500a63f	378	/* { netif->dhcp->request_timeout == 0 } */
andrewbonney	0:ec559500a63f	379	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
andrewbonney	0:ec559500a63f	380	/* this client's request timeout triggered */
andrewbonney	0:ec559500a63f	381	dhcp_timeout(netif);
andrewbonney	0:ec559500a63f	382	}
andrewbonney	0:ec559500a63f	383	}
andrewbonney	0:ec559500a63f	384	/* proceed to next network interface */
andrewbonney	0:ec559500a63f	385	netif = netif->next;
andrewbonney	0:ec559500a63f	386	}
andrewbonney	0:ec559500a63f	387	}
andrewbonney	0:ec559500a63f	388
andrewbonney	0:ec559500a63f	389	/**
andrewbonney	0:ec559500a63f	390	* A DHCP negotiation transaction, or ARP request, has timed out.
andrewbonney	0:ec559500a63f	391	*
andrewbonney	0:ec559500a63f	392	* The timer that was started with the DHCP or ARP request has
andrewbonney	0:ec559500a63f	393	* timed out, indicating no response was received in time.
andrewbonney	0:ec559500a63f	394	*
andrewbonney	0:ec559500a63f	395	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	396	*/
andrewbonney	0:ec559500a63f	397	static void
andrewbonney	0:ec559500a63f	398	dhcp_timeout(struct netif *netif)
andrewbonney	0:ec559500a63f	399	{
andrewbonney	0:ec559500a63f	400	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	401	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
andrewbonney	0:ec559500a63f	402	/* back-off period has passed, or server selection timed out */
andrewbonney	0:ec559500a63f	403	if ((dhcp->state == DHCP_BACKING_OFF) \|\| (dhcp->state == DHCP_SELECTING)) {
andrewbonney	0:ec559500a63f	404	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
andrewbonney	0:ec559500a63f	405	dhcp_discover(netif);
andrewbonney	0:ec559500a63f	406	/* receiving the requested lease timed out */
andrewbonney	0:ec559500a63f	407	} else if (dhcp->state == DHCP_REQUESTING) {
andrewbonney	0:ec559500a63f	408	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
andrewbonney	0:ec559500a63f	409	if (dhcp->tries <= 5) {
andrewbonney	0:ec559500a63f	410	dhcp_select(netif);
andrewbonney	0:ec559500a63f	411	} else {
andrewbonney	0:ec559500a63f	412	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
andrewbonney	0:ec559500a63f	413	dhcp_release(netif);
andrewbonney	0:ec559500a63f	414	dhcp_discover(netif);
andrewbonney	0:ec559500a63f	415	}
andrewbonney	0:ec559500a63f	416	#if DHCP_DOES_ARP_CHECK
andrewbonney	0:ec559500a63f	417	/* received no ARP reply for the offered address (which is good) */
andrewbonney	0:ec559500a63f	418	} else if (dhcp->state == DHCP_CHECKING) {
andrewbonney	0:ec559500a63f	419	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
andrewbonney	0:ec559500a63f	420	if (dhcp->tries <= 1) {
andrewbonney	0:ec559500a63f	421	dhcp_check(netif);
andrewbonney	0:ec559500a63f	422	/* no ARP replies on the offered address,
andrewbonney	0:ec559500a63f	423	looks like the IP address is indeed free */
andrewbonney	0:ec559500a63f	424	} else {
andrewbonney	0:ec559500a63f	425	/* bind the interface to the offered address */
andrewbonney	0:ec559500a63f	426	dhcp_bind(netif);
andrewbonney	0:ec559500a63f	427	}
andrewbonney	0:ec559500a63f	428	#endif /* DHCP_DOES_ARP_CHECK */
andrewbonney	0:ec559500a63f	429	}
andrewbonney	0:ec559500a63f	430	/* did not get response to renew request? */
andrewbonney	0:ec559500a63f	431	else if (dhcp->state == DHCP_RENEWING) {
andrewbonney	0:ec559500a63f	432	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
andrewbonney	0:ec559500a63f	433	/* just retry renewal */
andrewbonney	0:ec559500a63f	434	/* note that the rebind timer will eventually time-out if renew does not work */
andrewbonney	0:ec559500a63f	435	dhcp_renew(netif);
andrewbonney	0:ec559500a63f	436	/* did not get response to rebind request? */
andrewbonney	0:ec559500a63f	437	} else if (dhcp->state == DHCP_REBINDING) {
andrewbonney	0:ec559500a63f	438	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
andrewbonney	0:ec559500a63f	439	if (dhcp->tries <= 8) {
andrewbonney	0:ec559500a63f	440	dhcp_rebind(netif);
andrewbonney	0:ec559500a63f	441	} else {
andrewbonney	0:ec559500a63f	442	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
andrewbonney	0:ec559500a63f	443	dhcp_release(netif);
andrewbonney	0:ec559500a63f	444	dhcp_discover(netif);
andrewbonney	0:ec559500a63f	445	}
andrewbonney	0:ec559500a63f	446	} else if (dhcp->state == DHCP_REBOOTING) {
andrewbonney	0:ec559500a63f	447	if (dhcp->tries < REBOOT_TRIES) {
andrewbonney	0:ec559500a63f	448	dhcp_reboot(netif);
andrewbonney	0:ec559500a63f	449	} else {
andrewbonney	0:ec559500a63f	450	dhcp_discover(netif);
andrewbonney	0:ec559500a63f	451	}
andrewbonney	0:ec559500a63f	452	}
andrewbonney	0:ec559500a63f	453	}
andrewbonney	0:ec559500a63f	454
andrewbonney	0:ec559500a63f	455	/**
andrewbonney	0:ec559500a63f	456	* The renewal period has timed out.
andrewbonney	0:ec559500a63f	457	*
andrewbonney	0:ec559500a63f	458	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	459	*/
andrewbonney	0:ec559500a63f	460	static void
andrewbonney	0:ec559500a63f	461	dhcp_t1_timeout(struct netif *netif)
andrewbonney	0:ec559500a63f	462	{
andrewbonney	0:ec559500a63f	463	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
andrewbonney	0:ec559500a63f	465	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
andrewbonney	0:ec559500a63f	466	(dhcp->state == DHCP_RENEWING)) {
andrewbonney	0:ec559500a63f	467	/* just retry to renew - note that the rebind timer (t2) will
andrewbonney	0:ec559500a63f	468	* eventually time-out if renew tries fail. */
andrewbonney	0:ec559500a63f	469	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
andrewbonney	0:ec559500a63f	470	("dhcp_t1_timeout(): must renew\n"));
andrewbonney	0:ec559500a63f	471	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
andrewbonney	0:ec559500a63f	472	DHCP_RENEWING, not DHCP_BOUND */
andrewbonney	0:ec559500a63f	473	dhcp_renew(netif);
andrewbonney	0:ec559500a63f	474	}
andrewbonney	0:ec559500a63f	475	}
andrewbonney	0:ec559500a63f	476
andrewbonney	0:ec559500a63f	477	/**
andrewbonney	0:ec559500a63f	478	* The rebind period has timed out.
andrewbonney	0:ec559500a63f	479	*
andrewbonney	0:ec559500a63f	480	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	481	*/
andrewbonney	0:ec559500a63f	482	static void
andrewbonney	0:ec559500a63f	483	dhcp_t2_timeout(struct netif *netif)
andrewbonney	0:ec559500a63f	484	{
andrewbonney	0:ec559500a63f	485	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	486	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
andrewbonney	0:ec559500a63f	487	if ((dhcp->state == DHCP_REQUESTING) \|\| (dhcp->state == DHCP_BOUND) \|\|
andrewbonney	0:ec559500a63f	488	(dhcp->state == DHCP_RENEWING)) {
andrewbonney	0:ec559500a63f	489	/* just retry to rebind */
andrewbonney	0:ec559500a63f	490	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
andrewbonney	0:ec559500a63f	491	("dhcp_t2_timeout(): must rebind\n"));
andrewbonney	0:ec559500a63f	492	/* This slightly different to RFC2131: DHCPREQUEST will be sent from state
andrewbonney	0:ec559500a63f	493	DHCP_REBINDING, not DHCP_BOUND */
andrewbonney	0:ec559500a63f	494	dhcp_rebind(netif);
andrewbonney	0:ec559500a63f	495	}
andrewbonney	0:ec559500a63f	496	}
andrewbonney	0:ec559500a63f	497
andrewbonney	0:ec559500a63f	498	/**
andrewbonney	0:ec559500a63f	499	* Handle a DHCP ACK packet
andrewbonney	0:ec559500a63f	500	*
andrewbonney	0:ec559500a63f	501	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	502	*/
andrewbonney	0:ec559500a63f	503	static void
andrewbonney	0:ec559500a63f	504	dhcp_handle_ack(struct netif *netif)
andrewbonney	0:ec559500a63f	505	{
andrewbonney	0:ec559500a63f	506	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	507	#if LWIP_DNS
andrewbonney	0:ec559500a63f	508	u8_t n;
andrewbonney	0:ec559500a63f	509	#endif /* LWIP_DNS */
andrewbonney	0:ec559500a63f	510
andrewbonney	0:ec559500a63f	511	/* clear options we might not get from the ACK */
andrewbonney	0:ec559500a63f	512	ip_addr_set_zero(&dhcp->offered_sn_mask);
andrewbonney	0:ec559500a63f	513	ip_addr_set_zero(&dhcp->offered_gw_addr);
andrewbonney	0:ec559500a63f	514	#if LWIP_DHCP_BOOTP_FILE
andrewbonney	0:ec559500a63f	515	ip_addr_set_zero(&dhcp->offered_si_addr);
andrewbonney	0:ec559500a63f	516	#endif /* LWIP_DHCP_BOOTP_FILE */
andrewbonney	0:ec559500a63f	517
andrewbonney	0:ec559500a63f	518	/* lease time given? */
andrewbonney	0:ec559500a63f	519	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
andrewbonney	0:ec559500a63f	520	/* remember offered lease time */
andrewbonney	0:ec559500a63f	521	dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
andrewbonney	0:ec559500a63f	522	}
andrewbonney	0:ec559500a63f	523	/* renewal period given? */
andrewbonney	0:ec559500a63f	524	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
andrewbonney	0:ec559500a63f	525	/* remember given renewal period */
andrewbonney	0:ec559500a63f	526	dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
andrewbonney	0:ec559500a63f	527	} else {
andrewbonney	0:ec559500a63f	528	/* calculate safe periods for renewal */
andrewbonney	0:ec559500a63f	529	dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
andrewbonney	0:ec559500a63f	530	}
andrewbonney	0:ec559500a63f	531
andrewbonney	0:ec559500a63f	532	/* renewal period given? */
andrewbonney	0:ec559500a63f	533	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
andrewbonney	0:ec559500a63f	534	/* remember given rebind period */
andrewbonney	0:ec559500a63f	535	dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
andrewbonney	0:ec559500a63f	536	} else {
andrewbonney	0:ec559500a63f	537	/* calculate safe periods for rebinding */
andrewbonney	0:ec559500a63f	538	dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
andrewbonney	0:ec559500a63f	539	}
andrewbonney	0:ec559500a63f	540
andrewbonney	0:ec559500a63f	541	/* (y)our internet address */
andrewbonney	0:ec559500a63f	542	ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
andrewbonney	0:ec559500a63f	543
andrewbonney	0:ec559500a63f	544	#if LWIP_DHCP_BOOTP_FILE
andrewbonney	0:ec559500a63f	545	/* copy boot server address,
andrewbonney	0:ec559500a63f	546	boot file name copied in dhcp_parse_reply if not overloaded */
andrewbonney	0:ec559500a63f	547	ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
andrewbonney	0:ec559500a63f	548	#endif /* LWIP_DHCP_BOOTP_FILE */
andrewbonney	0:ec559500a63f	549
andrewbonney	0:ec559500a63f	550	/* subnet mask given? */
andrewbonney	0:ec559500a63f	551	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
andrewbonney	0:ec559500a63f	552	/* remember given subnet mask */
andrewbonney	0:ec559500a63f	553	ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
andrewbonney	0:ec559500a63f	554	dhcp->subnet_mask_given = 1;
andrewbonney	0:ec559500a63f	555	} else {
andrewbonney	0:ec559500a63f	556	dhcp->subnet_mask_given = 0;
andrewbonney	0:ec559500a63f	557	}
andrewbonney	0:ec559500a63f	558
andrewbonney	0:ec559500a63f	559	/* gateway router */
andrewbonney	0:ec559500a63f	560	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
andrewbonney	0:ec559500a63f	561	ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
andrewbonney	0:ec559500a63f	562	}
andrewbonney	0:ec559500a63f	563
andrewbonney	0:ec559500a63f	564	#if LWIP_DNS
andrewbonney	0:ec559500a63f	565	/* DNS servers */
andrewbonney	0:ec559500a63f	566	n = 0;
andrewbonney	0:ec559500a63f	567	while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
andrewbonney	0:ec559500a63f	568	ip_addr_t dns_addr;
andrewbonney	0:ec559500a63f	569	ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
andrewbonney	0:ec559500a63f	570	dns_setserver(n, &dns_addr);
andrewbonney	0:ec559500a63f	571	n++;
andrewbonney	0:ec559500a63f	572	}
andrewbonney	0:ec559500a63f	573	#endif /* LWIP_DNS */
andrewbonney	0:ec559500a63f	574	}
andrewbonney	0:ec559500a63f	575
andrewbonney	0:ec559500a63f	576	/** Set a statically allocated struct dhcp to work with.
andrewbonney	0:ec559500a63f	577	* Using this prevents dhcp_start to allocate it using mem_malloc.
andrewbonney	0:ec559500a63f	578	*
andrewbonney	0:ec559500a63f	579	* @param netif the netif for which to set the struct dhcp
andrewbonney	0:ec559500a63f	580	* @param dhcp (uninitialised) dhcp struct allocated by the application
andrewbonney	0:ec559500a63f	581	*/
andrewbonney	0:ec559500a63f	582	void
andrewbonney	0:ec559500a63f	583	dhcp_set_struct(struct netif netif, struct dhcp dhcp)
andrewbonney	0:ec559500a63f	584	{
andrewbonney	0:ec559500a63f	585	LWIP_ASSERT("netif != NULL", netif != NULL);
andrewbonney	0:ec559500a63f	586	LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
andrewbonney	0:ec559500a63f	587	LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
andrewbonney	0:ec559500a63f	588
andrewbonney	0:ec559500a63f	589	/* clear data structure */
andrewbonney	0:ec559500a63f	590	memset(dhcp, 0, sizeof(struct dhcp));
andrewbonney	0:ec559500a63f	591	/* dhcp_set_state(&dhcp, DHCP_OFF); */
andrewbonney	0:ec559500a63f	592	netif->dhcp = dhcp;
andrewbonney	0:ec559500a63f	593	}
andrewbonney	0:ec559500a63f	594
andrewbonney	0:ec559500a63f	595	/**
andrewbonney	0:ec559500a63f	596	* Start DHCP negotiation for a network interface.
andrewbonney	0:ec559500a63f	597	*
andrewbonney	0:ec559500a63f	598	* If no DHCP client instance was attached to this interface,
andrewbonney	0:ec559500a63f	599	* a new client is created first. If a DHCP client instance
andrewbonney	0:ec559500a63f	600	* was already present, it restarts negotiation.
andrewbonney	0:ec559500a63f	601	*
andrewbonney	0:ec559500a63f	602	* @param netif The lwIP network interface
andrewbonney	0:ec559500a63f	603	* @return lwIP error code
andrewbonney	0:ec559500a63f	604	* - ERR_OK - No error
andrewbonney	0:ec559500a63f	605	* - ERR_MEM - Out of memory
andrewbonney	0:ec559500a63f	606	*/
andrewbonney	0:ec559500a63f	607	err_t
andrewbonney	0:ec559500a63f	608	dhcp_start(struct netif *netif)
andrewbonney	0:ec559500a63f	609	{
andrewbonney	0:ec559500a63f	610	struct dhcp *dhcp;
andrewbonney	0:ec559500a63f	611	err_t result = ERR_OK;
andrewbonney	0:ec559500a63f	612
andrewbonney	0:ec559500a63f	613	LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
andrewbonney	0:ec559500a63f	614	dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	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));
andrewbonney	0:ec559500a63f	616	/* Remove the flag that says this netif is handled by DHCP,
andrewbonney	0:ec559500a63f	617	it is set when we succeeded starting. */
andrewbonney	0:ec559500a63f	618	netif->flags &= ~NETIF_FLAG_DHCP;
andrewbonney	0:ec559500a63f	619
andrewbonney	0:ec559500a63f	620	/* check hwtype of the netif */
andrewbonney	0:ec559500a63f	621	if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
andrewbonney	0:ec559500a63f	622	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
andrewbonney	0:ec559500a63f	623	return ERR_ARG;
andrewbonney	0:ec559500a63f	624	}
andrewbonney	0:ec559500a63f	625
andrewbonney	0:ec559500a63f	626	/* check MTU of the netif */
andrewbonney	0:ec559500a63f	627	if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
andrewbonney	0:ec559500a63f	628	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
andrewbonney	0:ec559500a63f	629	return ERR_MEM;
andrewbonney	0:ec559500a63f	630	}
andrewbonney	0:ec559500a63f	631
andrewbonney	0:ec559500a63f	632	/* no DHCP client attached yet? */
andrewbonney	0:ec559500a63f	633	if (dhcp == NULL) {
andrewbonney	0:ec559500a63f	634	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
andrewbonney	0:ec559500a63f	635	dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
andrewbonney	0:ec559500a63f	636	if (dhcp == NULL) {
andrewbonney	0:ec559500a63f	637	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
andrewbonney	0:ec559500a63f	638	return ERR_MEM;
andrewbonney	0:ec559500a63f	639	}
andrewbonney	0:ec559500a63f	640	/* store this dhcp client in the netif */
andrewbonney	0:ec559500a63f	641	netif->dhcp = dhcp;
andrewbonney	0:ec559500a63f	642	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
andrewbonney	0:ec559500a63f	643	/* already has DHCP client attached */
andrewbonney	0:ec559500a63f	644	} else {
andrewbonney	0:ec559500a63f	645	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
andrewbonney	0:ec559500a63f	646	if (dhcp->pcb != NULL) {
andrewbonney	0:ec559500a63f	647	udp_remove(dhcp->pcb);
andrewbonney	0:ec559500a63f	648	}
andrewbonney	0:ec559500a63f	649	LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
andrewbonney	0:ec559500a63f	650	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
andrewbonney	0:ec559500a63f	651	}
andrewbonney	0:ec559500a63f	652
andrewbonney	0:ec559500a63f	653	/* clear data structure */
andrewbonney	0:ec559500a63f	654	memset(dhcp, 0, sizeof(struct dhcp));
andrewbonney	0:ec559500a63f	655	/* dhcp_set_state(&dhcp, DHCP_OFF); */
andrewbonney	0:ec559500a63f	656	/* allocate UDP PCB */
andrewbonney	0:ec559500a63f	657	dhcp->pcb = udp_new();
andrewbonney	0:ec559500a63f	658	if (dhcp->pcb == NULL) {
andrewbonney	0:ec559500a63f	659	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
andrewbonney	0:ec559500a63f	660	return ERR_MEM;
andrewbonney	0:ec559500a63f	661	}
andrewbonney	0:ec559500a63f	662	dhcp->pcb->so_options \|= SOF_BROADCAST;
andrewbonney	0:ec559500a63f	663	/* set up local and remote port for the pcb */
andrewbonney	0:ec559500a63f	664	udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
andrewbonney	0:ec559500a63f	665	udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
andrewbonney	0:ec559500a63f	666	/* set up the recv callback and argument */
andrewbonney	0:ec559500a63f	667	udp_recv(dhcp->pcb, dhcp_recv, netif);
andrewbonney	0:ec559500a63f	668	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
andrewbonney	0:ec559500a63f	669	/* (re)start the DHCP negotiation */
andrewbonney	0:ec559500a63f	670	result = dhcp_discover(netif);
andrewbonney	0:ec559500a63f	671	if (result != ERR_OK) {
andrewbonney	0:ec559500a63f	672	/* free resources allocated above */
andrewbonney	0:ec559500a63f	673	dhcp_stop(netif);
andrewbonney	0:ec559500a63f	674	return ERR_MEM;
andrewbonney	0:ec559500a63f	675	}
andrewbonney	0:ec559500a63f	676	/* Set the flag that says this netif is handled by DHCP. */
andrewbonney	0:ec559500a63f	677	netif->flags \|= NETIF_FLAG_DHCP;
andrewbonney	0:ec559500a63f	678	return result;
andrewbonney	0:ec559500a63f	679	}
andrewbonney	0:ec559500a63f	680
andrewbonney	0:ec559500a63f	681	/**
andrewbonney	0:ec559500a63f	682	* Inform a DHCP server of our manual configuration.
andrewbonney	0:ec559500a63f	683	*
andrewbonney	0:ec559500a63f	684	* This informs DHCP servers of our fixed IP address configuration
andrewbonney	0:ec559500a63f	685	* by sending an INFORM message. It does not involve DHCP address
andrewbonney	0:ec559500a63f	686	* configuration, it is just here to be nice to the network.
andrewbonney	0:ec559500a63f	687	*
andrewbonney	0:ec559500a63f	688	* @param netif The lwIP network interface
andrewbonney	0:ec559500a63f	689	*/
andrewbonney	0:ec559500a63f	690	void
andrewbonney	0:ec559500a63f	691	dhcp_inform(struct netif *netif)
andrewbonney	0:ec559500a63f	692	{
andrewbonney	0:ec559500a63f	693	struct dhcp dhcp;
andrewbonney	0:ec559500a63f	694	err_t result = ERR_OK;
andrewbonney	0:ec559500a63f	695	struct udp_pcb *pcb;
andrewbonney	0:ec559500a63f	696
andrewbonney	0:ec559500a63f	697	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
andrewbonney	0:ec559500a63f	698
andrewbonney	0:ec559500a63f	699	memset(&dhcp, 0, sizeof(struct dhcp));
andrewbonney	0:ec559500a63f	700	dhcp_set_state(&dhcp, DHCP_INFORM);
andrewbonney	0:ec559500a63f	701
andrewbonney	0:ec559500a63f	702	if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
andrewbonney	0:ec559500a63f	703	/* re-use existing pcb */
andrewbonney	0:ec559500a63f	704	pcb = netif->dhcp->pcb;
andrewbonney	0:ec559500a63f	705	} else {
andrewbonney	0:ec559500a63f	706	pcb = udp_new();
andrewbonney	0:ec559500a63f	707	if (pcb == NULL) {
andrewbonney	0:ec559500a63f	708	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
andrewbonney	0:ec559500a63f	709	return;
andrewbonney	0:ec559500a63f	710	}
andrewbonney	0:ec559500a63f	711	dhcp.pcb = pcb;
andrewbonney	0:ec559500a63f	712	dhcp.pcb->so_options \|= SOF_BROADCAST;
andrewbonney	0:ec559500a63f	713	udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
andrewbonney	0:ec559500a63f	714	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
andrewbonney	0:ec559500a63f	715	}
andrewbonney	0:ec559500a63f	716	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	717	result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
andrewbonney	0:ec559500a63f	718	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	719	dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
andrewbonney	0:ec559500a63f	720	dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
andrewbonney	0:ec559500a63f	721
andrewbonney	0:ec559500a63f	722	dhcp_option_trailer(&dhcp);
andrewbonney	0:ec559500a63f	723
andrewbonney	0:ec559500a63f	724	pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
andrewbonney	0:ec559500a63f	725
andrewbonney	0:ec559500a63f	726	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
andrewbonney	0:ec559500a63f	727	udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	728	dhcp_delete_msg(&dhcp);
andrewbonney	0:ec559500a63f	729	} else {
andrewbonney	0:ec559500a63f	730	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	731	}
andrewbonney	0:ec559500a63f	732
andrewbonney	0:ec559500a63f	733	if (dhcp.pcb != NULL) {
andrewbonney	0:ec559500a63f	734	/* otherwise, the existing pcb was used */
andrewbonney	0:ec559500a63f	735	udp_remove(dhcp.pcb);
andrewbonney	0:ec559500a63f	736	}
andrewbonney	0:ec559500a63f	737	}
andrewbonney	0:ec559500a63f	738
andrewbonney	0:ec559500a63f	739	/** Handle a possible change in the network configuration.
andrewbonney	0:ec559500a63f	740	*
andrewbonney	0:ec559500a63f	741	* This enters the REBOOTING state to verify that the currently bound
andrewbonney	0:ec559500a63f	742	* address is still valid.
andrewbonney	0:ec559500a63f	743	*/
andrewbonney	0:ec559500a63f	744	void
andrewbonney	0:ec559500a63f	745	dhcp_network_changed(struct netif *netif)
andrewbonney	0:ec559500a63f	746	{
andrewbonney	0:ec559500a63f	747	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	748	if (!dhcp)
andrewbonney	0:ec559500a63f	749	return;
andrewbonney	0:ec559500a63f	750	switch (dhcp->state) {
andrewbonney	0:ec559500a63f	751	case DHCP_REBINDING:
andrewbonney	0:ec559500a63f	752	case DHCP_RENEWING:
andrewbonney	0:ec559500a63f	753	case DHCP_BOUND:
andrewbonney	0:ec559500a63f	754	case DHCP_REBOOTING:
andrewbonney	0:ec559500a63f	755	netif_set_down(netif);
andrewbonney	0:ec559500a63f	756	dhcp->tries = 0;
andrewbonney	0:ec559500a63f	757	dhcp_reboot(netif);
andrewbonney	0:ec559500a63f	758	break;
andrewbonney	0:ec559500a63f	759	case DHCP_OFF:
andrewbonney	0:ec559500a63f	760	/* stay off */
andrewbonney	0:ec559500a63f	761	break;
andrewbonney	0:ec559500a63f	762	default:
andrewbonney	0:ec559500a63f	763	dhcp->tries = 0;
andrewbonney	0:ec559500a63f	764	#if LWIP_DHCP_AUTOIP_COOP
andrewbonney	0:ec559500a63f	765	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
andrewbonney	0:ec559500a63f	766	#endif /* LWIP_DHCP_AUTOIP_COOP */
andrewbonney	0:ec559500a63f	767	dhcp_discover(netif);
andrewbonney	0:ec559500a63f	768	break;
andrewbonney	0:ec559500a63f	769	}
andrewbonney	0:ec559500a63f	770	}
andrewbonney	0:ec559500a63f	771
andrewbonney	0:ec559500a63f	772	#if DHCP_DOES_ARP_CHECK
andrewbonney	0:ec559500a63f	773	/**
andrewbonney	0:ec559500a63f	774	* Match an ARP reply with the offered IP address.
andrewbonney	0:ec559500a63f	775	*
andrewbonney	0:ec559500a63f	776	* @param netif the network interface on which the reply was received
andrewbonney	0:ec559500a63f	777	* @param addr The IP address we received a reply from
andrewbonney	0:ec559500a63f	778	*/
andrewbonney	0:ec559500a63f	779	void dhcp_arp_reply(struct netif netif, ip_addr_t addr)
andrewbonney	0:ec559500a63f	780	{
andrewbonney	0:ec559500a63f	781	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
andrewbonney	0:ec559500a63f	782	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
andrewbonney	0:ec559500a63f	783	/* is a DHCP client doing an ARP check? */
andrewbonney	0:ec559500a63f	784	if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
andrewbonney	0:ec559500a63f	785	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
andrewbonney	0:ec559500a63f	786	ip4_addr_get_u32(addr)));
andrewbonney	0:ec559500a63f	787	/* did a host respond with the address we
andrewbonney	0:ec559500a63f	788	were offered by the DHCP server? */
andrewbonney	0:ec559500a63f	789	if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
andrewbonney	0:ec559500a63f	790	/* we will not accept the offered address */
andrewbonney	0:ec559500a63f	791	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| LWIP_DBG_LEVEL_WARNING,
andrewbonney	0:ec559500a63f	792	("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
andrewbonney	0:ec559500a63f	793	dhcp_decline(netif);
andrewbonney	0:ec559500a63f	794	}
andrewbonney	0:ec559500a63f	795	}
andrewbonney	0:ec559500a63f	796	}
andrewbonney	0:ec559500a63f	797
andrewbonney	0:ec559500a63f	798	/**
andrewbonney	0:ec559500a63f	799	* Decline an offered lease.
andrewbonney	0:ec559500a63f	800	*
andrewbonney	0:ec559500a63f	801	* Tell the DHCP server we do not accept the offered address.
andrewbonney	0:ec559500a63f	802	* One reason to decline the lease is when we find out the address
andrewbonney	0:ec559500a63f	803	* is already in use by another host (through ARP).
andrewbonney	0:ec559500a63f	804	*
andrewbonney	0:ec559500a63f	805	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	806	*/
andrewbonney	0:ec559500a63f	807	static err_t
andrewbonney	0:ec559500a63f	808	dhcp_decline(struct netif *netif)
andrewbonney	0:ec559500a63f	809	{
andrewbonney	0:ec559500a63f	810	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	811	err_t result = ERR_OK;
andrewbonney	0:ec559500a63f	812	u16_t msecs;
andrewbonney	0:ec559500a63f	813	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline()\n"));
andrewbonney	0:ec559500a63f	814	dhcp_set_state(dhcp, DHCP_BACKING_OFF);
andrewbonney	0:ec559500a63f	815	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	816	result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
andrewbonney	0:ec559500a63f	817	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	818	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
andrewbonney	0:ec559500a63f	819	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
andrewbonney	0:ec559500a63f	820
andrewbonney	0:ec559500a63f	821	dhcp_option_trailer(dhcp);
andrewbonney	0:ec559500a63f	822	/* resize pbuf to reflect true size of options */
andrewbonney	0:ec559500a63f	823	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
andrewbonney	0:ec559500a63f	824
andrewbonney	0:ec559500a63f	825	/* per section 4.4.4, broadcast DECLINE messages */
andrewbonney	0:ec559500a63f	826	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	827	dhcp_delete_msg(dhcp);
andrewbonney	0:ec559500a63f	828	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
andrewbonney	0:ec559500a63f	829	} else {
andrewbonney	0:ec559500a63f	830	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
andrewbonney	0:ec559500a63f	831	("dhcp_decline: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	832	}
andrewbonney	0:ec559500a63f	833	dhcp->tries++;
andrewbonney	0:ec559500a63f	834	msecs = 10*1000;
andrewbonney	0:ec559500a63f	835	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	836	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	837	return result;
andrewbonney	0:ec559500a63f	838	}
andrewbonney	0:ec559500a63f	839	#endif /* DHCP_DOES_ARP_CHECK */
andrewbonney	0:ec559500a63f	840
andrewbonney	0:ec559500a63f	841
andrewbonney	0:ec559500a63f	842	/**
andrewbonney	0:ec559500a63f	843	* Start the DHCP process, discover a DHCP server.
andrewbonney	0:ec559500a63f	844	*
andrewbonney	0:ec559500a63f	845	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	846	*/
andrewbonney	0:ec559500a63f	847	static err_t
andrewbonney	0:ec559500a63f	848	dhcp_discover(struct netif *netif)
andrewbonney	0:ec559500a63f	849	{
andrewbonney	0:ec559500a63f	850	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	851	err_t result = ERR_OK;
andrewbonney	0:ec559500a63f	852	u16_t msecs;
andrewbonney	0:ec559500a63f	853	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover()\n"));
andrewbonney	0:ec559500a63f	854	ip_addr_set_any(&dhcp->offered_ip_addr);
andrewbonney	0:ec559500a63f	855	dhcp_set_state(dhcp, DHCP_SELECTING);
andrewbonney	0:ec559500a63f	856	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	857	result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
andrewbonney	0:ec559500a63f	858	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	859	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
andrewbonney	0:ec559500a63f	860
andrewbonney	0:ec559500a63f	861	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
andrewbonney	0:ec559500a63f	862	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
andrewbonney	0:ec559500a63f	863
andrewbonney	0:ec559500a63f	864	dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/num options/);
andrewbonney	0:ec559500a63f	865	dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
andrewbonney	0:ec559500a63f	866	dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
andrewbonney	0:ec559500a63f	867	dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
andrewbonney	0:ec559500a63f	868	dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
andrewbonney	0:ec559500a63f	869
andrewbonney	0:ec559500a63f	870	dhcp_option_trailer(dhcp);
andrewbonney	0:ec559500a63f	871
andrewbonney	0:ec559500a63f	872	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
andrewbonney	0:ec559500a63f	873	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
andrewbonney	0:ec559500a63f	874
andrewbonney	0:ec559500a63f	875	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
andrewbonney	0:ec559500a63f	876	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	877	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
andrewbonney	0:ec559500a63f	878	dhcp_delete_msg(dhcp);
andrewbonney	0:ec559500a63f	879	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
andrewbonney	0:ec559500a63f	880	} else {
andrewbonney	0:ec559500a63f	881	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	882	}
andrewbonney	0:ec559500a63f	883	dhcp->tries++;
andrewbonney	0:ec559500a63f	884	#if LWIP_DHCP_AUTOIP_COOP
andrewbonney	0:ec559500a63f	885	if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
andrewbonney	0:ec559500a63f	886	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
andrewbonney	0:ec559500a63f	887	autoip_start(netif);
andrewbonney	0:ec559500a63f	888	}
andrewbonney	0:ec559500a63f	889	#endif /* LWIP_DHCP_AUTOIP_COOP */
andrewbonney	0:ec559500a63f	890	msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
andrewbonney	0:ec559500a63f	891	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	892	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	893	return result;
andrewbonney	0:ec559500a63f	894	}
andrewbonney	0:ec559500a63f	895
andrewbonney	0:ec559500a63f	896
andrewbonney	0:ec559500a63f	897	/**
andrewbonney	0:ec559500a63f	898	* Bind the interface to the offered IP address.
andrewbonney	0:ec559500a63f	899	*
andrewbonney	0:ec559500a63f	900	* @param netif network interface to bind to the offered address
andrewbonney	0:ec559500a63f	901	*/
andrewbonney	0:ec559500a63f	902	static void
andrewbonney	0:ec559500a63f	903	dhcp_bind(struct netif *netif)
andrewbonney	0:ec559500a63f	904	{
andrewbonney	0:ec559500a63f	905	u32_t timeout;
andrewbonney	0:ec559500a63f	906	struct dhcp *dhcp;
andrewbonney	0:ec559500a63f	907	ip_addr_t sn_mask, gw_addr;
andrewbonney	0:ec559500a63f	908	LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
andrewbonney	0:ec559500a63f	909	dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	910	LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
andrewbonney	0:ec559500a63f	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));
andrewbonney	0:ec559500a63f	912
andrewbonney	0:ec559500a63f	913	/* temporary DHCP lease? */
andrewbonney	0:ec559500a63f	914	if (dhcp->offered_t1_renew != 0xffffffffUL) {
andrewbonney	0:ec559500a63f	915	/* set renewal period timer */
andrewbonney	0:ec559500a63f	916	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
andrewbonney	0:ec559500a63f	917	timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
andrewbonney	0:ec559500a63f	918	if(timeout > 0xffff) {
andrewbonney	0:ec559500a63f	919	timeout = 0xffff;
andrewbonney	0:ec559500a63f	920	}
andrewbonney	0:ec559500a63f	921	dhcp->t1_timeout = (u16_t)timeout;
andrewbonney	0:ec559500a63f	922	if (dhcp->t1_timeout == 0) {
andrewbonney	0:ec559500a63f	923	dhcp->t1_timeout = 1;
andrewbonney	0:ec559500a63f	924	}
andrewbonney	0:ec559500a63f	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));
andrewbonney	0:ec559500a63f	926	}
andrewbonney	0:ec559500a63f	927	/* set renewal period timer */
andrewbonney	0:ec559500a63f	928	if (dhcp->offered_t2_rebind != 0xffffffffUL) {
andrewbonney	0:ec559500a63f	929	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
andrewbonney	0:ec559500a63f	930	timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
andrewbonney	0:ec559500a63f	931	if(timeout > 0xffff) {
andrewbonney	0:ec559500a63f	932	timeout = 0xffff;
andrewbonney	0:ec559500a63f	933	}
andrewbonney	0:ec559500a63f	934	dhcp->t2_timeout = (u16_t)timeout;
andrewbonney	0:ec559500a63f	935	if (dhcp->t2_timeout == 0) {
andrewbonney	0:ec559500a63f	936	dhcp->t2_timeout = 1;
andrewbonney	0:ec559500a63f	937	}
andrewbonney	0:ec559500a63f	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));
andrewbonney	0:ec559500a63f	939	}
andrewbonney	0:ec559500a63f	940
andrewbonney	0:ec559500a63f	941	if (dhcp->subnet_mask_given) {
andrewbonney	0:ec559500a63f	942	/* copy offered network mask */
andrewbonney	0:ec559500a63f	943	ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
andrewbonney	0:ec559500a63f	944	} else {
andrewbonney	0:ec559500a63f	945	/* subnet mask not given, choose a safe subnet mask given the network class */
andrewbonney	0:ec559500a63f	946	u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
andrewbonney	0:ec559500a63f	947	if (first_octet <= 127) {
andrewbonney	0:ec559500a63f	948	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
andrewbonney	0:ec559500a63f	949	} else if (first_octet >= 192) {
andrewbonney	0:ec559500a63f	950	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
andrewbonney	0:ec559500a63f	951	} else {
andrewbonney	0:ec559500a63f	952	ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
andrewbonney	0:ec559500a63f	953	}
andrewbonney	0:ec559500a63f	954	}
andrewbonney	0:ec559500a63f	955
andrewbonney	0:ec559500a63f	956	ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
andrewbonney	0:ec559500a63f	957	/* gateway address not given? */
andrewbonney	0:ec559500a63f	958	if (ip_addr_isany(&gw_addr)) {
andrewbonney	0:ec559500a63f	959	/* copy network address */
andrewbonney	0:ec559500a63f	960	ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
andrewbonney	0:ec559500a63f	961	/* use first host address on network as gateway */
andrewbonney	0:ec559500a63f	962	ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) \| PP_HTONL(0x00000001));
andrewbonney	0:ec559500a63f	963	}
andrewbonney	0:ec559500a63f	964
andrewbonney	0:ec559500a63f	965	#if LWIP_DHCP_AUTOIP_COOP
andrewbonney	0:ec559500a63f	966	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
andrewbonney	0:ec559500a63f	967	autoip_stop(netif);
andrewbonney	0:ec559500a63f	968	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
andrewbonney	0:ec559500a63f	969	}
andrewbonney	0:ec559500a63f	970	#endif /* LWIP_DHCP_AUTOIP_COOP */
andrewbonney	0:ec559500a63f	971
andrewbonney	0:ec559500a63f	972	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
andrewbonney	0:ec559500a63f	973	ip4_addr_get_u32(&dhcp->offered_ip_addr)));
andrewbonney	0:ec559500a63f	974	netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
andrewbonney	0:ec559500a63f	975	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
andrewbonney	0:ec559500a63f	976	ip4_addr_get_u32(&sn_mask)));
andrewbonney	0:ec559500a63f	977	netif_set_netmask(netif, &sn_mask);
andrewbonney	0:ec559500a63f	978	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
andrewbonney	0:ec559500a63f	979	ip4_addr_get_u32(&gw_addr)));
andrewbonney	0:ec559500a63f	980	netif_set_gw(netif, &gw_addr);
andrewbonney	0:ec559500a63f	981	/* bring the interface up */
andrewbonney	0:ec559500a63f	982	netif_set_up(netif);
andrewbonney	0:ec559500a63f	983	/* netif is now bound to DHCP leased address */
andrewbonney	0:ec559500a63f	984	dhcp_set_state(dhcp, DHCP_BOUND);
andrewbonney	0:ec559500a63f	985	}
andrewbonney	0:ec559500a63f	986
andrewbonney	0:ec559500a63f	987	/**
andrewbonney	0:ec559500a63f	988	* Renew an existing DHCP lease at the involved DHCP server.
andrewbonney	0:ec559500a63f	989	*
andrewbonney	0:ec559500a63f	990	* @param netif network interface which must renew its lease
andrewbonney	0:ec559500a63f	991	*/
andrewbonney	0:ec559500a63f	992	err_t
andrewbonney	0:ec559500a63f	993	dhcp_renew(struct netif *netif)
andrewbonney	0:ec559500a63f	994	{
andrewbonney	0:ec559500a63f	995	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	996	err_t result;
andrewbonney	0:ec559500a63f	997	u16_t msecs;
andrewbonney	0:ec559500a63f	998	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_renew()\n"));
andrewbonney	0:ec559500a63f	999	dhcp_set_state(dhcp, DHCP_RENEWING);
andrewbonney	0:ec559500a63f	1000
andrewbonney	0:ec559500a63f	1001	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	1002	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
andrewbonney	0:ec559500a63f	1003	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	1004	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
andrewbonney	0:ec559500a63f	1005	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
andrewbonney	0:ec559500a63f	1006
andrewbonney	0:ec559500a63f	1007	#if LWIP_NETIF_HOSTNAME
andrewbonney	0:ec559500a63f	1008	if (netif->hostname != NULL) {
andrewbonney	0:ec559500a63f	1009	const char p = (const char)netif->hostname;
andrewbonney	0:ec559500a63f	1010	u8_t namelen = (u8_t)strlen(p);
andrewbonney	0:ec559500a63f	1011	if (namelen > 0) {
andrewbonney	0:ec559500a63f	1012	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
andrewbonney	0:ec559500a63f	1013	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
andrewbonney	0:ec559500a63f	1014	while (*p) {
andrewbonney	0:ec559500a63f	1015	dhcp_option_byte(dhcp, *p++);
andrewbonney	0:ec559500a63f	1016	}
andrewbonney	0:ec559500a63f	1017	}
andrewbonney	0:ec559500a63f	1018	}
andrewbonney	0:ec559500a63f	1019	#endif /* LWIP_NETIF_HOSTNAME */
andrewbonney	0:ec559500a63f	1020
andrewbonney	0:ec559500a63f	1021	#if 0
andrewbonney	0:ec559500a63f	1022	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
andrewbonney	0:ec559500a63f	1023	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
andrewbonney	0:ec559500a63f	1024	#endif
andrewbonney	0:ec559500a63f	1025
andrewbonney	0:ec559500a63f	1026	#if 0
andrewbonney	0:ec559500a63f	1027	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
andrewbonney	0:ec559500a63f	1028	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
andrewbonney	0:ec559500a63f	1029	#endif
andrewbonney	0:ec559500a63f	1030	/* append DHCP message trailer */
andrewbonney	0:ec559500a63f	1031	dhcp_option_trailer(dhcp);
andrewbonney	0:ec559500a63f	1032
andrewbonney	0:ec559500a63f	1033	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
andrewbonney	0:ec559500a63f	1034
andrewbonney	0:ec559500a63f	1035	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	1036	dhcp_delete_msg(dhcp);
andrewbonney	0:ec559500a63f	1037
andrewbonney	0:ec559500a63f	1038	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
andrewbonney	0:ec559500a63f	1039	} else {
andrewbonney	0:ec559500a63f	1040	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	1041	}
andrewbonney	0:ec559500a63f	1042	dhcp->tries++;
andrewbonney	0:ec559500a63f	1043	/* back-off on retries, but to a maximum of 20 seconds */
andrewbonney	0:ec559500a63f	1044	msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
andrewbonney	0:ec559500a63f	1045	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	1046	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	1047	return result;
andrewbonney	0:ec559500a63f	1048	}
andrewbonney	0:ec559500a63f	1049
andrewbonney	0:ec559500a63f	1050	/**
andrewbonney	0:ec559500a63f	1051	* Rebind with a DHCP server for an existing DHCP lease.
andrewbonney	0:ec559500a63f	1052	*
andrewbonney	0:ec559500a63f	1053	* @param netif network interface which must rebind with a DHCP server
andrewbonney	0:ec559500a63f	1054	*/
andrewbonney	0:ec559500a63f	1055	static err_t
andrewbonney	0:ec559500a63f	1056	dhcp_rebind(struct netif *netif)
andrewbonney	0:ec559500a63f	1057	{
andrewbonney	0:ec559500a63f	1058	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	1059	err_t result;
andrewbonney	0:ec559500a63f	1060	u16_t msecs;
andrewbonney	0:ec559500a63f	1061	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind()\n"));
andrewbonney	0:ec559500a63f	1062	dhcp_set_state(dhcp, DHCP_REBINDING);
andrewbonney	0:ec559500a63f	1063
andrewbonney	0:ec559500a63f	1064	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	1065	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
andrewbonney	0:ec559500a63f	1066	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	1067	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
andrewbonney	0:ec559500a63f	1068	dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
andrewbonney	0:ec559500a63f	1069
andrewbonney	0:ec559500a63f	1070	#if LWIP_NETIF_HOSTNAME
andrewbonney	0:ec559500a63f	1071	if (netif->hostname != NULL) {
andrewbonney	0:ec559500a63f	1072	const char p = (const char)netif->hostname;
andrewbonney	0:ec559500a63f	1073	u8_t namelen = (u8_t)strlen(p);
andrewbonney	0:ec559500a63f	1074	if (namelen > 0) {
andrewbonney	0:ec559500a63f	1075	LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
andrewbonney	0:ec559500a63f	1076	dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
andrewbonney	0:ec559500a63f	1077	while (*p) {
andrewbonney	0:ec559500a63f	1078	dhcp_option_byte(dhcp, *p++);
andrewbonney	0:ec559500a63f	1079	}
andrewbonney	0:ec559500a63f	1080	}
andrewbonney	0:ec559500a63f	1081	}
andrewbonney	0:ec559500a63f	1082	#endif /* LWIP_NETIF_HOSTNAME */
andrewbonney	0:ec559500a63f	1083
andrewbonney	0:ec559500a63f	1084	#if 0
andrewbonney	0:ec559500a63f	1085	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
andrewbonney	0:ec559500a63f	1086	dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
andrewbonney	0:ec559500a63f	1087
andrewbonney	0:ec559500a63f	1088	dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
andrewbonney	0:ec559500a63f	1089	dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
andrewbonney	0:ec559500a63f	1090	#endif
andrewbonney	0:ec559500a63f	1091
andrewbonney	0:ec559500a63f	1092	dhcp_option_trailer(dhcp);
andrewbonney	0:ec559500a63f	1093
andrewbonney	0:ec559500a63f	1094	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
andrewbonney	0:ec559500a63f	1095
andrewbonney	0:ec559500a63f	1096	/* broadcast to server */
andrewbonney	0:ec559500a63f	1097	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	1098	dhcp_delete_msg(dhcp);
andrewbonney	0:ec559500a63f	1099	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
andrewbonney	0:ec559500a63f	1100	} else {
andrewbonney	0:ec559500a63f	1101	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	1102	}
andrewbonney	0:ec559500a63f	1103	dhcp->tries++;
andrewbonney	0:ec559500a63f	1104	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
andrewbonney	0:ec559500a63f	1105	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	1106	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	1107	return result;
andrewbonney	0:ec559500a63f	1108	}
andrewbonney	0:ec559500a63f	1109
andrewbonney	0:ec559500a63f	1110	/**
andrewbonney	0:ec559500a63f	1111	* Enter REBOOTING state to verify an existing lease
andrewbonney	0:ec559500a63f	1112	*
andrewbonney	0:ec559500a63f	1113	* @param netif network interface which must reboot
andrewbonney	0:ec559500a63f	1114	*/
andrewbonney	0:ec559500a63f	1115	static err_t
andrewbonney	0:ec559500a63f	1116	dhcp_reboot(struct netif *netif)
andrewbonney	0:ec559500a63f	1117	{
andrewbonney	0:ec559500a63f	1118	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	1119	err_t result;
andrewbonney	0:ec559500a63f	1120	u16_t msecs;
andrewbonney	0:ec559500a63f	1121	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot()\n"));
andrewbonney	0:ec559500a63f	1122	dhcp_set_state(dhcp, DHCP_REBOOTING);
andrewbonney	0:ec559500a63f	1123
andrewbonney	0:ec559500a63f	1124	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	1125	result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
andrewbonney	0:ec559500a63f	1126	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	1127	dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
andrewbonney	0:ec559500a63f	1128	dhcp_option_short(dhcp, 576);
andrewbonney	0:ec559500a63f	1129
andrewbonney	0:ec559500a63f	1130	dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
andrewbonney	0:ec559500a63f	1131	dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
andrewbonney	0:ec559500a63f	1132
andrewbonney	0:ec559500a63f	1133	dhcp_option_trailer(dhcp);
andrewbonney	0:ec559500a63f	1134
andrewbonney	0:ec559500a63f	1135	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
andrewbonney	0:ec559500a63f	1136
andrewbonney	0:ec559500a63f	1137	/* broadcast to server */
andrewbonney	0:ec559500a63f	1138	udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	1139	dhcp_delete_msg(dhcp);
andrewbonney	0:ec559500a63f	1140	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
andrewbonney	0:ec559500a63f	1141	} else {
andrewbonney	0:ec559500a63f	1142	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	1143	}
andrewbonney	0:ec559500a63f	1144	dhcp->tries++;
andrewbonney	0:ec559500a63f	1145	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
andrewbonney	0:ec559500a63f	1146	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	1147	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	1148	return result;
andrewbonney	0:ec559500a63f	1149	}
andrewbonney	0:ec559500a63f	1150
andrewbonney	0:ec559500a63f	1151
andrewbonney	0:ec559500a63f	1152	/**
andrewbonney	0:ec559500a63f	1153	* Release a DHCP lease.
andrewbonney	0:ec559500a63f	1154	*
andrewbonney	0:ec559500a63f	1155	* @param netif network interface which must release its lease
andrewbonney	0:ec559500a63f	1156	*/
andrewbonney	0:ec559500a63f	1157	err_t
andrewbonney	0:ec559500a63f	1158	dhcp_release(struct netif *netif)
andrewbonney	0:ec559500a63f	1159	{
andrewbonney	0:ec559500a63f	1160	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	1161	err_t result;
andrewbonney	0:ec559500a63f	1162	u16_t msecs;
andrewbonney	0:ec559500a63f	1163	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_release()\n"));
andrewbonney	0:ec559500a63f	1164
andrewbonney	0:ec559500a63f	1165	/* idle DHCP client */
andrewbonney	0:ec559500a63f	1166	dhcp_set_state(dhcp, DHCP_OFF);
andrewbonney	0:ec559500a63f	1167	/* clean old DHCP offer */
andrewbonney	0:ec559500a63f	1168	ip_addr_set_zero(&dhcp->server_ip_addr);
andrewbonney	0:ec559500a63f	1169	ip_addr_set_zero(&dhcp->offered_ip_addr);
andrewbonney	0:ec559500a63f	1170	ip_addr_set_zero(&dhcp->offered_sn_mask);
andrewbonney	0:ec559500a63f	1171	ip_addr_set_zero(&dhcp->offered_gw_addr);
andrewbonney	0:ec559500a63f	1172	#if LWIP_DHCP_BOOTP_FILE
andrewbonney	0:ec559500a63f	1173	ip_addr_set_zero(&dhcp->offered_si_addr);
andrewbonney	0:ec559500a63f	1174	#endif /* LWIP_DHCP_BOOTP_FILE */
andrewbonney	0:ec559500a63f	1175	dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
andrewbonney	0:ec559500a63f	1176
andrewbonney	0:ec559500a63f	1177	/* create and initialize the DHCP message header */
andrewbonney	0:ec559500a63f	1178	result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
andrewbonney	0:ec559500a63f	1179	if (result == ERR_OK) {
andrewbonney	0:ec559500a63f	1180	dhcp_option_trailer(dhcp);
andrewbonney	0:ec559500a63f	1181
andrewbonney	0:ec559500a63f	1182	pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
andrewbonney	0:ec559500a63f	1183
andrewbonney	0:ec559500a63f	1184	udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
andrewbonney	0:ec559500a63f	1185	dhcp_delete_msg(dhcp);
andrewbonney	0:ec559500a63f	1186	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
andrewbonney	0:ec559500a63f	1187	} else {
andrewbonney	0:ec559500a63f	1188	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
andrewbonney	0:ec559500a63f	1189	}
andrewbonney	0:ec559500a63f	1190	dhcp->tries++;
andrewbonney	0:ec559500a63f	1191	msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
andrewbonney	0:ec559500a63f	1192	dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
andrewbonney	0:ec559500a63f	1193	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
andrewbonney	0:ec559500a63f	1194	/* bring the interface down */
andrewbonney	0:ec559500a63f	1195	netif_set_down(netif);
andrewbonney	0:ec559500a63f	1196	/* remove IP address from interface */
andrewbonney	0:ec559500a63f	1197	netif_set_ipaddr(netif, IP_ADDR_ANY);
andrewbonney	0:ec559500a63f	1198	netif_set_gw(netif, IP_ADDR_ANY);
andrewbonney	0:ec559500a63f	1199	netif_set_netmask(netif, IP_ADDR_ANY);
andrewbonney	0:ec559500a63f	1200
andrewbonney	0:ec559500a63f	1201	return result;
andrewbonney	0:ec559500a63f	1202	}
andrewbonney	0:ec559500a63f	1203
andrewbonney	0:ec559500a63f	1204	/**
andrewbonney	0:ec559500a63f	1205	* Remove the DHCP client from the interface.
andrewbonney	0:ec559500a63f	1206	*
andrewbonney	0:ec559500a63f	1207	* @param netif The network interface to stop DHCP on
andrewbonney	0:ec559500a63f	1208	*/
andrewbonney	0:ec559500a63f	1209	void
andrewbonney	0:ec559500a63f	1210	dhcp_stop(struct netif *netif)
andrewbonney	0:ec559500a63f	1211	{
andrewbonney	0:ec559500a63f	1212	struct dhcp *dhcp;
andrewbonney	0:ec559500a63f	1213	LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
andrewbonney	0:ec559500a63f	1214	dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	1215	/* Remove the flag that says this netif is handled by DHCP. */
andrewbonney	0:ec559500a63f	1216	netif->flags &= ~NETIF_FLAG_DHCP;
andrewbonney	0:ec559500a63f	1217
andrewbonney	0:ec559500a63f	1218	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("dhcp_stop()\n"));
andrewbonney	0:ec559500a63f	1219	/* netif is DHCP configured? */
andrewbonney	0:ec559500a63f	1220	if (dhcp != NULL) {
andrewbonney	0:ec559500a63f	1221	#if LWIP_DHCP_AUTOIP_COOP
andrewbonney	0:ec559500a63f	1222	if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
andrewbonney	0:ec559500a63f	1223	autoip_stop(netif);
andrewbonney	0:ec559500a63f	1224	dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
andrewbonney	0:ec559500a63f	1225	}
andrewbonney	0:ec559500a63f	1226	#endif /* LWIP_DHCP_AUTOIP_COOP */
andrewbonney	0:ec559500a63f	1227
andrewbonney	0:ec559500a63f	1228	if (dhcp->pcb != NULL) {
andrewbonney	0:ec559500a63f	1229	udp_remove(dhcp->pcb);
andrewbonney	0:ec559500a63f	1230	dhcp->pcb = NULL;
andrewbonney	0:ec559500a63f	1231	}
andrewbonney	0:ec559500a63f	1232	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
andrewbonney	0:ec559500a63f	1233	dhcp_set_state(dhcp, DHCP_OFF);
andrewbonney	0:ec559500a63f	1234	}
andrewbonney	0:ec559500a63f	1235	}
andrewbonney	0:ec559500a63f	1236
andrewbonney	0:ec559500a63f	1237	/*
andrewbonney	0:ec559500a63f	1238	* Set the DHCP state of a DHCP client.
andrewbonney	0:ec559500a63f	1239	*
andrewbonney	0:ec559500a63f	1240	* If the state changed, reset the number of tries.
andrewbonney	0:ec559500a63f	1241	*/
andrewbonney	0:ec559500a63f	1242	static void
andrewbonney	0:ec559500a63f	1243	dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
andrewbonney	0:ec559500a63f	1244	{
andrewbonney	0:ec559500a63f	1245	if (new_state != dhcp->state) {
andrewbonney	0:ec559500a63f	1246	dhcp->state = new_state;
andrewbonney	0:ec559500a63f	1247	dhcp->tries = 0;
andrewbonney	0:ec559500a63f	1248	dhcp->request_timeout = 0;
andrewbonney	0:ec559500a63f	1249	}
andrewbonney	0:ec559500a63f	1250	}
andrewbonney	0:ec559500a63f	1251
andrewbonney	0:ec559500a63f	1252	/*
andrewbonney	0:ec559500a63f	1253	* Concatenate an option type and length field to the outgoing
andrewbonney	0:ec559500a63f	1254	* DHCP message.
andrewbonney	0:ec559500a63f	1255	*
andrewbonney	0:ec559500a63f	1256	*/
andrewbonney	0:ec559500a63f	1257	static void
andrewbonney	0:ec559500a63f	1258	dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
andrewbonney	0:ec559500a63f	1259	{
andrewbonney	0:ec559500a63f	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);
andrewbonney	0:ec559500a63f	1261	dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
andrewbonney	0:ec559500a63f	1262	dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
andrewbonney	0:ec559500a63f	1263	}
andrewbonney	0:ec559500a63f	1264	/*
andrewbonney	0:ec559500a63f	1265	* Concatenate a single byte to the outgoing DHCP message.
andrewbonney	0:ec559500a63f	1266	*
andrewbonney	0:ec559500a63f	1267	*/
andrewbonney	0:ec559500a63f	1268	static void
andrewbonney	0:ec559500a63f	1269	dhcp_option_byte(struct dhcp *dhcp, u8_t value)
andrewbonney	0:ec559500a63f	1270	{
andrewbonney	0:ec559500a63f	1271	LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
andrewbonney	0:ec559500a63f	1272	dhcp->msg_out->options[dhcp->options_out_len++] = value;
andrewbonney	0:ec559500a63f	1273	}
andrewbonney	0:ec559500a63f	1274
andrewbonney	0:ec559500a63f	1275	static void
andrewbonney	0:ec559500a63f	1276	dhcp_option_short(struct dhcp *dhcp, u16_t value)
andrewbonney	0:ec559500a63f	1277	{
andrewbonney	0:ec559500a63f	1278	LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
andrewbonney	0:ec559500a63f	1279	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
andrewbonney	0:ec559500a63f	1280	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
andrewbonney	0:ec559500a63f	1281	}
andrewbonney	0:ec559500a63f	1282
andrewbonney	0:ec559500a63f	1283	static void
andrewbonney	0:ec559500a63f	1284	dhcp_option_long(struct dhcp *dhcp, u32_t value)
andrewbonney	0:ec559500a63f	1285	{
andrewbonney	0:ec559500a63f	1286	LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
andrewbonney	0:ec559500a63f	1287	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
andrewbonney	0:ec559500a63f	1288	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
andrewbonney	0:ec559500a63f	1289	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
andrewbonney	0:ec559500a63f	1290	dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
andrewbonney	0:ec559500a63f	1291	}
andrewbonney	0:ec559500a63f	1292
andrewbonney	0:ec559500a63f	1293	/**
andrewbonney	0:ec559500a63f	1294	* Extract the DHCP message and the DHCP options.
andrewbonney	0:ec559500a63f	1295	*
andrewbonney	0:ec559500a63f	1296	* Extract the DHCP message and the DHCP options, each into a contiguous
andrewbonney	0:ec559500a63f	1297	* piece of memory. As a DHCP message is variable sized by its options,
andrewbonney	0:ec559500a63f	1298	* and also allows overriding some fields for options, the easy approach
andrewbonney	0:ec559500a63f	1299	* is to first unfold the options into a conitguous piece of memory, and
andrewbonney	0:ec559500a63f	1300	* use that further on.
andrewbonney	0:ec559500a63f	1301	*
andrewbonney	0:ec559500a63f	1302	*/
andrewbonney	0:ec559500a63f	1303	static err_t
andrewbonney	0:ec559500a63f	1304	dhcp_parse_reply(struct dhcp dhcp, struct pbuf p)
andrewbonney	0:ec559500a63f	1305	{
andrewbonney	0:ec559500a63f	1306	u8_t *options;
andrewbonney	0:ec559500a63f	1307	u16_t offset;
andrewbonney	0:ec559500a63f	1308	u16_t offset_max;
andrewbonney	0:ec559500a63f	1309	u16_t options_idx;
andrewbonney	0:ec559500a63f	1310	u16_t options_idx_max;
andrewbonney	0:ec559500a63f	1311	struct pbuf *q;
andrewbonney	0:ec559500a63f	1312	int parse_file_as_options = 0;
andrewbonney	0:ec559500a63f	1313	int parse_sname_as_options = 0;
andrewbonney	0:ec559500a63f	1314
andrewbonney	0:ec559500a63f	1315	/* clear received options */
andrewbonney	0:ec559500a63f	1316	dhcp_clear_all_options(dhcp);
andrewbonney	0:ec559500a63f	1317	/* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
andrewbonney	0:ec559500a63f	1318	if (p->len < DHCP_SNAME_OFS) {
andrewbonney	0:ec559500a63f	1319	return ERR_BUF;
andrewbonney	0:ec559500a63f	1320	}
andrewbonney	0:ec559500a63f	1321	dhcp->msg_in = (struct dhcp_msg *)p->payload;
andrewbonney	0:ec559500a63f	1322	#if LWIP_DHCP_BOOTP_FILE
andrewbonney	0:ec559500a63f	1323	/* clear boot file name */
andrewbonney	0:ec559500a63f	1324	dhcp->boot_file_name[0] = 0;
andrewbonney	0:ec559500a63f	1325	#endif /* LWIP_DHCP_BOOTP_FILE */
andrewbonney	0:ec559500a63f	1326
andrewbonney	0:ec559500a63f	1327	/* parse options */
andrewbonney	0:ec559500a63f	1328
andrewbonney	0:ec559500a63f	1329	/* start with options field */
andrewbonney	0:ec559500a63f	1330	options_idx = DHCP_OPTIONS_OFS;
andrewbonney	0:ec559500a63f	1331	/* parse options to the end of the received packet */
andrewbonney	0:ec559500a63f	1332	options_idx_max = p->tot_len;
andrewbonney	0:ec559500a63f	1333	again:
andrewbonney	0:ec559500a63f	1334	q = p;
andrewbonney	0:ec559500a63f	1335	while((q != NULL) && (options_idx >= q->len)) {
andrewbonney	0:ec559500a63f	1336	options_idx -= q->len;
andrewbonney	0:ec559500a63f	1337	options_idx_max -= q->len;
andrewbonney	0:ec559500a63f	1338	q = q->next;
andrewbonney	0:ec559500a63f	1339	}
andrewbonney	0:ec559500a63f	1340	if (q == NULL) {
andrewbonney	0:ec559500a63f	1341	return ERR_BUF;
andrewbonney	0:ec559500a63f	1342	}
andrewbonney	0:ec559500a63f	1343	offset = options_idx;
andrewbonney	0:ec559500a63f	1344	offset_max = options_idx_max;
andrewbonney	0:ec559500a63f	1345	options = (u8_t*)q->payload;
andrewbonney	0:ec559500a63f	1346	/* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
andrewbonney	0:ec559500a63f	1347	while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
andrewbonney	0:ec559500a63f	1348	u8_t op = options[offset];
andrewbonney	0:ec559500a63f	1349	u8_t len;
andrewbonney	0:ec559500a63f	1350	u8_t decode_len = 0;
andrewbonney	0:ec559500a63f	1351	int decode_idx = -1;
andrewbonney	0:ec559500a63f	1352	u16_t val_offset = offset + 2;
andrewbonney	0:ec559500a63f	1353	/* len byte might be in the next pbuf */
andrewbonney	0:ec559500a63f	1354	if (offset + 1 < q->len) {
andrewbonney	0:ec559500a63f	1355	len = options[offset + 1];
andrewbonney	0:ec559500a63f	1356	} else {
andrewbonney	0:ec559500a63f	1357	len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
andrewbonney	0:ec559500a63f	1358	}
andrewbonney	0:ec559500a63f	1359	/* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
andrewbonney	0:ec559500a63f	1360	decode_len = len;
andrewbonney	0:ec559500a63f	1361	switch(op) {
andrewbonney	0:ec559500a63f	1362	/* case(DHCP_OPTION_END): handled above */
andrewbonney	0:ec559500a63f	1363	case(DHCP_OPTION_PAD):
andrewbonney	0:ec559500a63f	1364	/* special option: no len encoded */
andrewbonney	0:ec559500a63f	1365	decode_len = len = 0;
andrewbonney	0:ec559500a63f	1366	/* will be increased below */
andrewbonney	0:ec559500a63f	1367	offset--;
andrewbonney	0:ec559500a63f	1368	break;
andrewbonney	0:ec559500a63f	1369	case(DHCP_OPTION_SUBNET_MASK):
andrewbonney	0:ec559500a63f	1370	LWIP_ASSERT("len == 4", len == 4);
andrewbonney	0:ec559500a63f	1371	decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
andrewbonney	0:ec559500a63f	1372	break;
andrewbonney	0:ec559500a63f	1373	case(DHCP_OPTION_ROUTER):
andrewbonney	0:ec559500a63f	1374	decode_len = 4; /* only copy the first given router */
andrewbonney	0:ec559500a63f	1375	LWIP_ASSERT("len >= decode_len", len >= decode_len);
andrewbonney	0:ec559500a63f	1376	decode_idx = DHCP_OPTION_IDX_ROUTER;
andrewbonney	0:ec559500a63f	1377	break;
andrewbonney	0:ec559500a63f	1378	case(DHCP_OPTION_DNS_SERVER):
andrewbonney	0:ec559500a63f	1379	/* special case: there might be more than one server */
andrewbonney	0:ec559500a63f	1380	LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
andrewbonney	0:ec559500a63f	1381	/* limit number of DNS servers */
andrewbonney	0:ec559500a63f	1382	decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
andrewbonney	0:ec559500a63f	1383	LWIP_ASSERT("len >= decode_len", len >= decode_len);
andrewbonney	0:ec559500a63f	1384	decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
andrewbonney	0:ec559500a63f	1385	break;
andrewbonney	0:ec559500a63f	1386	case(DHCP_OPTION_LEASE_TIME):
andrewbonney	0:ec559500a63f	1387	LWIP_ASSERT("len == 4", len == 4);
andrewbonney	0:ec559500a63f	1388	decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
andrewbonney	0:ec559500a63f	1389	break;
andrewbonney	0:ec559500a63f	1390	case(DHCP_OPTION_OVERLOAD):
andrewbonney	0:ec559500a63f	1391	LWIP_ASSERT("len == 1", len == 1);
andrewbonney	0:ec559500a63f	1392	decode_idx = DHCP_OPTION_IDX_OVERLOAD;
andrewbonney	0:ec559500a63f	1393	break;
andrewbonney	0:ec559500a63f	1394	case(DHCP_OPTION_MESSAGE_TYPE):
andrewbonney	0:ec559500a63f	1395	LWIP_ASSERT("len == 1", len == 1);
andrewbonney	0:ec559500a63f	1396	decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
andrewbonney	0:ec559500a63f	1397	break;
andrewbonney	0:ec559500a63f	1398	case(DHCP_OPTION_SERVER_ID):
andrewbonney	0:ec559500a63f	1399	LWIP_ASSERT("len == 4", len == 4);
andrewbonney	0:ec559500a63f	1400	decode_idx = DHCP_OPTION_IDX_SERVER_ID;
andrewbonney	0:ec559500a63f	1401	break;
andrewbonney	0:ec559500a63f	1402	case(DHCP_OPTION_T1):
andrewbonney	0:ec559500a63f	1403	LWIP_ASSERT("len == 4", len == 4);
andrewbonney	0:ec559500a63f	1404	decode_idx = DHCP_OPTION_IDX_T1;
andrewbonney	0:ec559500a63f	1405	break;
andrewbonney	0:ec559500a63f	1406	case(DHCP_OPTION_T2):
andrewbonney	0:ec559500a63f	1407	LWIP_ASSERT("len == 4", len == 4);
andrewbonney	0:ec559500a63f	1408	decode_idx = DHCP_OPTION_IDX_T2;
andrewbonney	0:ec559500a63f	1409	break;
andrewbonney	0:ec559500a63f	1410	default:
andrewbonney	0:ec559500a63f	1411	decode_len = 0;
andrewbonney	0:ec559500a63f	1412	LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
andrewbonney	0:ec559500a63f	1413	break;
andrewbonney	0:ec559500a63f	1414	}
andrewbonney	0:ec559500a63f	1415	offset += len + 2;
andrewbonney	0:ec559500a63f	1416	if (decode_len > 0) {
andrewbonney	0:ec559500a63f	1417	u32_t value = 0;
andrewbonney	0:ec559500a63f	1418	u16_t copy_len;
andrewbonney	0:ec559500a63f	1419	decode_next:
andrewbonney	0:ec559500a63f	1420	LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
andrewbonney	0:ec559500a63f	1421	LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
andrewbonney	0:ec559500a63f	1422	copy_len = LWIP_MIN(decode_len, 4);
andrewbonney	0:ec559500a63f	1423	pbuf_copy_partial(q, &value, copy_len, val_offset);
andrewbonney	0:ec559500a63f	1424	if (decode_len > 4) {
andrewbonney	0:ec559500a63f	1425	/* decode more than one u32_t */
andrewbonney	0:ec559500a63f	1426	LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
andrewbonney	0:ec559500a63f	1427	dhcp_got_option(dhcp, decode_idx);
andrewbonney	0:ec559500a63f	1428	dhcp_set_option_value(dhcp, decode_idx, htonl(value));
andrewbonney	0:ec559500a63f	1429	decode_len -= 4;
andrewbonney	0:ec559500a63f	1430	val_offset += 4;
andrewbonney	0:ec559500a63f	1431	decode_idx++;
andrewbonney	0:ec559500a63f	1432	goto decode_next;
andrewbonney	0:ec559500a63f	1433	} else if (decode_len == 4) {
andrewbonney	0:ec559500a63f	1434	value = ntohl(value);
andrewbonney	0:ec559500a63f	1435	} else {
andrewbonney	0:ec559500a63f	1436	LWIP_ASSERT("invalid decode_len", decode_len == 1);
andrewbonney	0:ec559500a63f	1437	value = ((u8_t*)&value)[0];
andrewbonney	0:ec559500a63f	1438	}
andrewbonney	0:ec559500a63f	1439	dhcp_got_option(dhcp, decode_idx);
andrewbonney	0:ec559500a63f	1440	dhcp_set_option_value(dhcp, decode_idx, value);
andrewbonney	0:ec559500a63f	1441	}
andrewbonney	0:ec559500a63f	1442	if (offset >= q->len) {
andrewbonney	0:ec559500a63f	1443	offset -= q->len;
andrewbonney	0:ec559500a63f	1444	offset_max -= q->len;
andrewbonney	0:ec559500a63f	1445	q = q->next;
andrewbonney	0:ec559500a63f	1446	options = (u8_t*)q->payload;
andrewbonney	0:ec559500a63f	1447	}
andrewbonney	0:ec559500a63f	1448	}
andrewbonney	0:ec559500a63f	1449	/* is this an overloaded message? */
andrewbonney	0:ec559500a63f	1450	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
andrewbonney	0:ec559500a63f	1451	u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
andrewbonney	0:ec559500a63f	1452	dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
andrewbonney	0:ec559500a63f	1453	if (overload == DHCP_OVERLOAD_FILE) {
andrewbonney	0:ec559500a63f	1454	parse_file_as_options = 1;
andrewbonney	0:ec559500a63f	1455	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded file field\n"));
andrewbonney	0:ec559500a63f	1456	} else if (overload == DHCP_OVERLOAD_SNAME) {
andrewbonney	0:ec559500a63f	1457	parse_sname_as_options = 1;
andrewbonney	0:ec559500a63f	1458	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname field\n"));
andrewbonney	0:ec559500a63f	1459	} else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
andrewbonney	0:ec559500a63f	1460	parse_sname_as_options = 1;
andrewbonney	0:ec559500a63f	1461	parse_file_as_options = 1;
andrewbonney	0:ec559500a63f	1462	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
andrewbonney	0:ec559500a63f	1463	} else {
andrewbonney	0:ec559500a63f	1464	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
andrewbonney	0:ec559500a63f	1465	}
andrewbonney	0:ec559500a63f	1466	#if LWIP_DHCP_BOOTP_FILE
andrewbonney	0:ec559500a63f	1467	if (!parse_file_as_options) {
andrewbonney	0:ec559500a63f	1468	/* only do this for ACK messages */
andrewbonney	0:ec559500a63f	1469	if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
andrewbonney	0:ec559500a63f	1470	(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
andrewbonney	0:ec559500a63f	1471	/* copy bootp file name, don't care for sname (server hostname) */
andrewbonney	0:ec559500a63f	1472	pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
andrewbonney	0:ec559500a63f	1473	/* make sure the string is really NULL-terminated */
andrewbonney	0:ec559500a63f	1474	dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
andrewbonney	0:ec559500a63f	1475	}
andrewbonney	0:ec559500a63f	1476	#endif /* LWIP_DHCP_BOOTP_FILE */
andrewbonney	0:ec559500a63f	1477	}
andrewbonney	0:ec559500a63f	1478	if (parse_file_as_options) {
andrewbonney	0:ec559500a63f	1479	/* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
andrewbonney	0:ec559500a63f	1480	parse_file_as_options = 0;
andrewbonney	0:ec559500a63f	1481	options_idx = DHCP_FILE_OFS;
andrewbonney	0:ec559500a63f	1482	options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
andrewbonney	0:ec559500a63f	1483	goto again;
andrewbonney	0:ec559500a63f	1484	} else if (parse_sname_as_options) {
andrewbonney	0:ec559500a63f	1485	parse_sname_as_options = 0;
andrewbonney	0:ec559500a63f	1486	options_idx = DHCP_SNAME_OFS;
andrewbonney	0:ec559500a63f	1487	options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
andrewbonney	0:ec559500a63f	1488	goto again;
andrewbonney	0:ec559500a63f	1489	}
andrewbonney	0:ec559500a63f	1490	return ERR_OK;
andrewbonney	0:ec559500a63f	1491	}
andrewbonney	0:ec559500a63f	1492
andrewbonney	0:ec559500a63f	1493	/**
andrewbonney	0:ec559500a63f	1494	* If an incoming DHCP message is in response to us, then trigger the state machine
andrewbonney	0:ec559500a63f	1495	*/
andrewbonney	0:ec559500a63f	1496	static void
andrewbonney	0:ec559500a63f	1497	dhcp_recv(void arg, struct udp_pcb pcb, struct pbuf p, ip_addr_t addr, u16_t port)
andrewbonney	0:ec559500a63f	1498	{
andrewbonney	0:ec559500a63f	1499	struct netif netif = (struct netif )arg;
andrewbonney	0:ec559500a63f	1500	struct dhcp *dhcp = netif->dhcp;
andrewbonney	0:ec559500a63f	1501	struct dhcp_msg reply_msg = (struct dhcp_msg )p->payload;
andrewbonney	0:ec559500a63f	1502	u8_t msg_type;
andrewbonney	0:ec559500a63f	1503	u8_t i;
andrewbonney	0:ec559500a63f	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,
andrewbonney	0:ec559500a63f	1505	ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
andrewbonney	0:ec559500a63f	1506	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
andrewbonney	0:ec559500a63f	1507	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
andrewbonney	0:ec559500a63f	1508	/* prevent warnings about unused arguments */
andrewbonney	0:ec559500a63f	1509	LWIP_UNUSED_ARG(pcb);
andrewbonney	0:ec559500a63f	1510	LWIP_UNUSED_ARG(addr);
andrewbonney	0:ec559500a63f	1511	LWIP_UNUSED_ARG(port);
andrewbonney	0:ec559500a63f	1512
andrewbonney	0:ec559500a63f	1513	LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
andrewbonney	0:ec559500a63f	1514
andrewbonney	0:ec559500a63f	1515	if (p->len < DHCP_MIN_REPLY_LEN) {
andrewbonney	0:ec559500a63f	1516	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
andrewbonney	0:ec559500a63f	1517	goto free_pbuf_and_return;
andrewbonney	0:ec559500a63f	1518	}
andrewbonney	0:ec559500a63f	1519
andrewbonney	0:ec559500a63f	1520	if (reply_msg->op != DHCP_BOOTREPLY) {
andrewbonney	0:ec559500a63f	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));
andrewbonney	0:ec559500a63f	1522	goto free_pbuf_and_return;
andrewbonney	0:ec559500a63f	1523	}
andrewbonney	0:ec559500a63f	1524	/* iterate through hardware address and match against DHCP message */
andrewbonney	0:ec559500a63f	1525	for (i = 0; i < netif->hwaddr_len; i++) {
andrewbonney	0:ec559500a63f	1526	if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
andrewbonney	0:ec559500a63f	1527	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
andrewbonney	0:ec559500a63f	1528	("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
andrewbonney	0:ec559500a63f	1529	(u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
andrewbonney	0:ec559500a63f	1530	goto free_pbuf_and_return;
andrewbonney	0:ec559500a63f	1531	}
andrewbonney	0:ec559500a63f	1532	}
andrewbonney	0:ec559500a63f	1533	/* match transaction ID against what we expected */
andrewbonney	0:ec559500a63f	1534	if (ntohl(reply_msg->xid) != dhcp->xid) {
andrewbonney	0:ec559500a63f	1535	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
andrewbonney	0:ec559500a63f	1536	("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
andrewbonney	0:ec559500a63f	1537	goto free_pbuf_and_return;
andrewbonney	0:ec559500a63f	1538	}
andrewbonney	0:ec559500a63f	1539	/* option fields could be unfold? */
andrewbonney	0:ec559500a63f	1540	if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
andrewbonney	0:ec559500a63f	1541	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
andrewbonney	0:ec559500a63f	1542	("problem unfolding DHCP message - too short on memory?\n"));
andrewbonney	0:ec559500a63f	1543	goto free_pbuf_and_return;
andrewbonney	0:ec559500a63f	1544	}
andrewbonney	0:ec559500a63f	1545
andrewbonney	0:ec559500a63f	1546	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
andrewbonney	0:ec559500a63f	1547	/* obtain pointer to DHCP message type */
andrewbonney	0:ec559500a63f	1548	if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
andrewbonney	0:ec559500a63f	1549	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
andrewbonney	0:ec559500a63f	1550	goto free_pbuf_and_return;
andrewbonney	0:ec559500a63f	1551	}
andrewbonney	0:ec559500a63f	1552
andrewbonney	0:ec559500a63f	1553	/* read DHCP message type */
andrewbonney	0:ec559500a63f	1554	msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
andrewbonney	0:ec559500a63f	1555	/* message type is DHCP ACK? */
andrewbonney	0:ec559500a63f	1556	if (msg_type == DHCP_ACK) {
andrewbonney	0:ec559500a63f	1557	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
andrewbonney	0:ec559500a63f	1558	/* in requesting state? */
andrewbonney	0:ec559500a63f	1559	if (dhcp->state == DHCP_REQUESTING) {
andrewbonney	0:ec559500a63f	1560	dhcp_handle_ack(netif);
andrewbonney	0:ec559500a63f	1561	#if DHCP_DOES_ARP_CHECK
andrewbonney	0:ec559500a63f	1562	/* check if the acknowledged lease address is already in use */
andrewbonney	0:ec559500a63f	1563	dhcp_check(netif);
andrewbonney	0:ec559500a63f	1564	#else
andrewbonney	0:ec559500a63f	1565	/* bind interface to the acknowledged lease address */
andrewbonney	0:ec559500a63f	1566	dhcp_bind(netif);
andrewbonney	0:ec559500a63f	1567	#endif
andrewbonney	0:ec559500a63f	1568	}
andrewbonney	0:ec559500a63f	1569	/* already bound to the given lease address? */
andrewbonney	0:ec559500a63f	1570	else if ((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING)) {
andrewbonney	0:ec559500a63f	1571	dhcp_bind(netif);
andrewbonney	0:ec559500a63f	1572	}
andrewbonney	0:ec559500a63f	1573	}
andrewbonney	0:ec559500a63f	1574	/* received a DHCP_NAK in appropriate state? */
andrewbonney	0:ec559500a63f	1575	else if ((msg_type == DHCP_NAK) &&
andrewbonney	0:ec559500a63f	1576	((dhcp->state == DHCP_REBOOTING) \|\| (dhcp->state == DHCP_REQUESTING) \|\|
andrewbonney	0:ec559500a63f	1577	(dhcp->state == DHCP_REBINDING) \|\| (dhcp->state == DHCP_RENEWING ))) {
andrewbonney	0:ec559500a63f	1578	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
andrewbonney	0:ec559500a63f	1579	dhcp_handle_nak(netif);
andrewbonney	0:ec559500a63f	1580	}
andrewbonney	0:ec559500a63f	1581	/* received a DHCP_OFFER in DHCP_SELECTING state? */
andrewbonney	0:ec559500a63f	1582	else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
andrewbonney	0:ec559500a63f	1583	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
andrewbonney	0:ec559500a63f	1584	dhcp->request_timeout = 0;
andrewbonney	0:ec559500a63f	1585	/* remember offered lease */
andrewbonney	0:ec559500a63f	1586	dhcp_handle_offer(netif);
andrewbonney	0:ec559500a63f	1587	}
andrewbonney	0:ec559500a63f	1588	free_pbuf_and_return:
andrewbonney	0:ec559500a63f	1589	dhcp->msg_in = NULL;
andrewbonney	0:ec559500a63f	1590	pbuf_free(p);
andrewbonney	0:ec559500a63f	1591	}
andrewbonney	0:ec559500a63f	1592
andrewbonney	0:ec559500a63f	1593	/**
andrewbonney	0:ec559500a63f	1594	* Create a DHCP request, fill in common headers
andrewbonney	0:ec559500a63f	1595	*
andrewbonney	0:ec559500a63f	1596	* @param netif the netif under DHCP control
andrewbonney	0:ec559500a63f	1597	* @param dhcp dhcp control struct
andrewbonney	0:ec559500a63f	1598	* @param message_type message type of the request
andrewbonney	0:ec559500a63f	1599	*/
andrewbonney	0:ec559500a63f	1600	static err_t
andrewbonney	0:ec559500a63f	1601	dhcp_create_msg(struct netif netif, struct dhcp dhcp, u8_t message_type)
andrewbonney	0:ec559500a63f	1602	{
andrewbonney	0:ec559500a63f	1603	u16_t i;
andrewbonney	0:ec559500a63f	1604	#ifndef DHCP_GLOBAL_XID
andrewbonney	0:ec559500a63f	1605	/** default global transaction identifier starting value (easy to match
andrewbonney	0:ec559500a63f	1606	* with a packet analyser). We simply increment for each new request.
andrewbonney	0:ec559500a63f	1607	* Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
andrewbonney	0:ec559500a63f	1608	* at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
andrewbonney	0:ec559500a63f	1609	static u32_t xid = 0xABCD0000;
andrewbonney	0:ec559500a63f	1610	#else
andrewbonney	0:ec559500a63f	1611	static u32_t xid;
andrewbonney	0:ec559500a63f	1612	static u8_t xid_initialised = 0;
andrewbonney	0:ec559500a63f	1613	if (!xid_initialised) {
andrewbonney	0:ec559500a63f	1614	xid = DHCP_GLOBAL_XID;
andrewbonney	0:ec559500a63f	1615	xid_initialised = !xid_initialised;
andrewbonney	0:ec559500a63f	1616	}
andrewbonney	0:ec559500a63f	1617	#endif
andrewbonney	0:ec559500a63f	1618	LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
andrewbonney	0:ec559500a63f	1619	LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
andrewbonney	0:ec559500a63f	1620	LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
andrewbonney	0:ec559500a63f	1621	LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
andrewbonney	0:ec559500a63f	1622	dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
andrewbonney	0:ec559500a63f	1623	if (dhcp->p_out == NULL) {
andrewbonney	0:ec559500a63f	1624	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
andrewbonney	0:ec559500a63f	1625	("dhcp_create_msg(): could not allocate pbuf\n"));
andrewbonney	0:ec559500a63f	1626	return ERR_MEM;
andrewbonney	0:ec559500a63f	1627	}
andrewbonney	0:ec559500a63f	1628	LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
andrewbonney	0:ec559500a63f	1629	(dhcp->p_out->len >= sizeof(struct dhcp_msg)));
andrewbonney	0:ec559500a63f	1630
andrewbonney	0:ec559500a63f	1631	/* reuse transaction identifier in retransmissions */
andrewbonney	0:ec559500a63f	1632	if (dhcp->tries == 0) {
andrewbonney	0:ec559500a63f	1633	xid++;
andrewbonney	0:ec559500a63f	1634	}
andrewbonney	0:ec559500a63f	1635	dhcp->xid = xid;
andrewbonney	0:ec559500a63f	1636	LWIP_DEBUGF(DHCP_DEBUG \| LWIP_DBG_TRACE,
andrewbonney	0:ec559500a63f	1637	("transaction id xid(%"X32_F")\n", xid));
andrewbonney	0:ec559500a63f	1638
andrewbonney	0:ec559500a63f	1639	dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
andrewbonney	0:ec559500a63f	1640
andrewbonney	0:ec559500a63f	1641	dhcp->msg_out->op = DHCP_BOOTREQUEST;
andrewbonney	0:ec559500a63f	1642	/* TODO: make link layer independent */
andrewbonney	0:ec559500a63f	1643	dhcp->msg_out->htype = DHCP_HTYPE_ETH;
andrewbonney	0:ec559500a63f	1644	dhcp->msg_out->hlen = netif->hwaddr_len;
andrewbonney	0:ec559500a63f	1645	dhcp->msg_out->hops = 0;
andrewbonney	0:ec559500a63f	1646	dhcp->msg_out->xid = htonl(dhcp->xid);
andrewbonney	0:ec559500a63f	1647	dhcp->msg_out->secs = 0;
andrewbonney	0:ec559500a63f	1648	/* we don't need the broadcast flag since we can receive unicast traffic
andrewbonney	0:ec559500a63f	1649	before being fully configured! */
andrewbonney	0:ec559500a63f	1650	dhcp->msg_out->flags = 0;
andrewbonney	0:ec559500a63f	1651	ip_addr_set_zero(&dhcp->msg_out->ciaddr);
andrewbonney	0:ec559500a63f	1652	/* set ciaddr to netif->ip_addr based on message_type and state */
andrewbonney	0:ec559500a63f	1653	if ((message_type == DHCP_INFORM) \|\| (message_type == DHCP_DECLINE) \|\|
andrewbonney	0:ec559500a63f	1654	((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
andrewbonney	0:ec559500a63f	1655	((dhcp->state==DHCP_RENEWING) \|\| dhcp->state==DHCP_REBINDING))) {
andrewbonney	0:ec559500a63f	1656	ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
andrewbonney	0:ec559500a63f	1657	}
andrewbonney	0:ec559500a63f	1658	ip_addr_set_zero(&dhcp->msg_out->yiaddr);
andrewbonney	0:ec559500a63f	1659	ip_addr_set_zero(&dhcp->msg_out->siaddr);
andrewbonney	0:ec559500a63f	1660	ip_addr_set_zero(&dhcp->msg_out->giaddr);
andrewbonney	0:ec559500a63f	1661	for (i = 0; i < DHCP_CHADDR_LEN; i++) {
andrewbonney	0:ec559500a63f	1662	/* copy netif hardware address, pad with zeroes */
andrewbonney	0:ec559500a63f	1663	dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
andrewbonney	0:ec559500a63f	1664	}
andrewbonney	0:ec559500a63f	1665	for (i = 0; i < DHCP_SNAME_LEN; i++) {
andrewbonney	0:ec559500a63f	1666	dhcp->msg_out->sname[i] = 0;
andrewbonney	0:ec559500a63f	1667	}
andrewbonney	0:ec559500a63f	1668	for (i = 0; i < DHCP_FILE_LEN; i++) {
andrewbonney	0:ec559500a63f	1669	dhcp->msg_out->file[i] = 0;
andrewbonney	0:ec559500a63f	1670	}
andrewbonney	0:ec559500a63f	1671	dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
andrewbonney	0:ec559500a63f	1672	dhcp->options_out_len = 0;
andrewbonney	0:ec559500a63f	1673	/* fill options field with an incrementing array (for debugging purposes) */
andrewbonney	0:ec559500a63f	1674	for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
andrewbonney	0:ec559500a63f	1675	dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
andrewbonney	0:ec559500a63f	1676	}
andrewbonney	0:ec559500a63f	1677	/* Add option MESSAGE_TYPE */
andrewbonney	0:ec559500a63f	1678	dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
andrewbonney	0:ec559500a63f	1679	dhcp_option_byte(dhcp, message_type);
andrewbonney	0:ec559500a63f	1680	return ERR_OK;
andrewbonney	0:ec559500a63f	1681	}
andrewbonney	0:ec559500a63f	1682
andrewbonney	0:ec559500a63f	1683	/**
andrewbonney	0:ec559500a63f	1684	* Free previously allocated memory used to send a DHCP request.
andrewbonney	0:ec559500a63f	1685	*
andrewbonney	0:ec559500a63f	1686	* @param dhcp the dhcp struct to free the request from
andrewbonney	0:ec559500a63f	1687	*/
andrewbonney	0:ec559500a63f	1688	static void
andrewbonney	0:ec559500a63f	1689	dhcp_delete_msg(struct dhcp *dhcp)
andrewbonney	0:ec559500a63f	1690	{
andrewbonney	0:ec559500a63f	1691	LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
andrewbonney	0:ec559500a63f	1692	LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
andrewbonney	0:ec559500a63f	1693	LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
andrewbonney	0:ec559500a63f	1694	if (dhcp->p_out != NULL) {
andrewbonney	0:ec559500a63f	1695	pbuf_free(dhcp->p_out);
andrewbonney	0:ec559500a63f	1696	}
andrewbonney	0:ec559500a63f	1697	dhcp->p_out = NULL;
andrewbonney	0:ec559500a63f	1698	dhcp->msg_out = NULL;
andrewbonney	0:ec559500a63f	1699	}
andrewbonney	0:ec559500a63f	1700
andrewbonney	0:ec559500a63f	1701	/**
andrewbonney	0:ec559500a63f	1702	* Add a DHCP message trailer
andrewbonney	0:ec559500a63f	1703	*
andrewbonney	0:ec559500a63f	1704	* Adds the END option to the DHCP message, and if
andrewbonney	0:ec559500a63f	1705	* necessary, up to three padding bytes.
andrewbonney	0:ec559500a63f	1706	*
andrewbonney	0:ec559500a63f	1707	* @param dhcp DHCP state structure
andrewbonney	0:ec559500a63f	1708	*/
andrewbonney	0:ec559500a63f	1709	static void
andrewbonney	0:ec559500a63f	1710	dhcp_option_trailer(struct dhcp *dhcp)
andrewbonney	0:ec559500a63f	1711	{
andrewbonney	0:ec559500a63f	1712	LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
andrewbonney	0:ec559500a63f	1713	LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
andrewbonney	0:ec559500a63f	1714	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
andrewbonney	0:ec559500a63f	1715	dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
andrewbonney	0:ec559500a63f	1716	/* packet is too small, or not 4 byte aligned? */
andrewbonney	0:ec559500a63f	1717	while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) \|\| (dhcp->options_out_len & 3)) {
andrewbonney	0:ec559500a63f	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)); */
andrewbonney	0:ec559500a63f	1719	LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
andrewbonney	0:ec559500a63f	1720	/* add a fill/padding byte */
andrewbonney	0:ec559500a63f	1721	dhcp->msg_out->options[dhcp->options_out_len++] = 0;
andrewbonney	0:ec559500a63f	1722	}
andrewbonney	0:ec559500a63f	1723	}
andrewbonney	0:ec559500a63f	1724
andrewbonney	0:ec559500a63f	1725	#endif /* LWIP_DHCP */

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Type:	Library
Created:	08 Apr 2011
Imports:	86
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	3

lwip/core/dhcp.c@0:ec559500a63f, 2011-04-08 (annotated)

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