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lwip: Add dhcp servers post processing hook

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In order to access DHCP messages from clients in different states
and possibly to implement custom handlers that alter the current state,
e.g. reject a client with specific hostname using NAK.
This commit is contained in:
David Cermak 2022-01-04 16:44:26 +01:00
parent e3d71c984a
commit 05911fd4a1
2 changed files with 22 additions and 1 deletions
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8
components/lwip/apps/dhcpserver/dhcpserver.c
View File

@ -955,6 +955,7 @@ static void handle_dhcp(void *arg,
u16_t dhcps_msg_cnt = 0;
u8_t *p_dhcps_msg = NULL;
u8_t *data;
s16_t state;
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> receive a packet\n");
@ -1026,7 +1027,12 @@ static void handle_dhcp(void *arg,
DHCPS_LOG("dhcps: handle_dhcp-> parse_msg(p)\n");
#endif
switch (parse_msg(pmsg_dhcps, tlen - 240)) {
state = parse_msg(pmsg_dhcps, tlen - 240);
#ifdef LWIP_HOOK_DHCPS_POST_STATE
state = LWIP_HOOK_DHCPS_POST_STATE(pmsg_dhcps, malloc_len, state);
#endif /* LWIP_HOOK_DHCPS_POST_STATE */
switch (state) {
case DHCPS_STATE_OFFER://1
#if DHCPS_DEBUG
DHCPS_LOG("dhcps: handle_dhcp-> DHCPD_STATE_OFFER\n");

15
components/lwip/include/apps/dhcpserver/dhcpserver.h
View File

@ -45,6 +45,21 @@ enum dhcps_offer_option{
OFFER_END
};
/** @brief DHCP server's description of compile time configuration values in dhcpserver.c
*
* - DHCPS_DEBUG: Prints very detailed debug messages if set to 1, hardcoded to 0
* - USE_CLASS_B_NET: Use class B network mask if enabled, not-defined (could be enabled as CC_FLAGS)
* - MAX_STATION_NUM: Maximum number of clients, set to Kconfig value CONFIG_LWIP_DHCPS_MAX_STATION_NUM
* - LWIP_HOOK_DHCPS_POST_STATE: Used to inject user code after parsing DHCP message, not defined
* - could be enabled in lwipopts.h or via CC_FLAGS
* - basic usage of the hook to print hex representation of the entire option field is below:
* #define LWIP_HOOK_DHCPS_POST_STATE(msg, len, state) \
* ({ s16_t ret = state; if (state == DHCPS_STATE_ACK) { ESP_LOG_BUFFER_HEXDUMP("DHCPS",msg->options, 312, ESP_LOG_INFO);} ret; })
*/
/**
* @brief Definitions related to lease time, units and limits
*/
#define DHCPS_COARSE_TIMER_SECS 1
#define DHCPS_MAX_LEASE 0x64
#define DHCPS_LEASE_TIME_DEF (120)