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contrib/addons: Add example of using DHCP extra options hooks

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This commit is contained in:
David Cermak
2022-04-05 11:18:12 +02:00
committed by Simon Goldschmidt
parent f50c87da6f
commit 187e4ededd
3 changed files with 157 additions and 0 deletions
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contrib/addons/dhcp_extra_opts/dhcp_extra_opts.h Normal file
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/*
* Copyright (c) Espressif Systems (Shanghai) CO LTD
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* To use these additional DHCP options, make sure this file is included in LWIP_HOOK_FILENAME
* and define these hooks:
*
* #define LWIP_HOOK_DHCP_PARSE_OPTION(netif, dhcp, state, msg, msg_type, option, len, pbuf, offset) \
* do { LWIP_UNUSED_ARG(msg); \
* dhcp_parse_extra_opts(dhcp, state, option, len, pbuf, offset); \
* } while(0)
*
* #define LWIP_HOOK_DHCP_APPEND_OPTIONS(netif, dhcp, state, msg, msg_type, options_len_ptr) \
* dhcp_append_extra_opts(netif, state, msg, options_len_ptr);
*
* To enable (disable) these option, please set one or both of the below macros to 1 (0)
* #define LWIP_DHCP_ENABLE_MTU_UPDATE 1
* #define LWIP_DHCP_ENABLE_CLIENT_ID 1
*/
#ifndef LWIP_HDR_CONTRIB_ADDONS_DHCP_OPTS_H
#define LWIP_HDR_CONTRIB_ADDONS_DHCP_OPTS_H
/* Add standard integers so the header could be included before lwip */
#include <stdint.h>
/* Forward declare lwip structs */
struct dhcp;
struct pbuf;
struct dhcp;
struct netif;
struct dhcp_msg;
/* Internal hook functions */
void dhcp_parse_extra_opts(struct dhcp *dhcp, uint8_t state, uint8_t option, uint8_t len, struct pbuf* p, uint16_t offset);
void dhcp_append_extra_opts(struct netif *netif, uint8_t state, struct dhcp_msg *msg_out, uint16_t *options_out_len);
#endif /* LWIP_HDR_CONTRIB_ADDONS_DHCP_OPTS_H */