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dhcp_service_api.h File Reference
Typedefs | Functions

dhcp_service_api.h File Reference

DHCP server connection interfaces. More...

Go to the source code of this file.

Typedefs

typedef int( dhcp_service_receive_req_cb )(uint16_t instance_id, uint32_t msg_tr_id, uint8_t msg_name, uint8_t *msg_ptr, uint16_t msg_len)
 DHCP Service receive callback.
typedef int( dhcp_service_receive_resp_cb )(uint16_t instance_id, void *ptr, uint8_t msg_name, uint8_t *msg_ptr, uint16_t msg_len)
 DHCP Service Message Response callback.

Functions

uint16_t dhcp_service_init (int8_t interface_id, dhcp_instance_type_e instance_type, dhcp_service_receive_req_cb *receive_req_cb)
 Initialize a new DHCP service instance.
void dhcp_service_delete (uint16_t instance)
 Deletes a server instance.
int dhcp_service_send_resp (uint32_t msg_tr_id, uint8_t options, uint8_t *msg_ptr, uint16_t msg_len)
 Sends a DHCP response message.
uint32_t dhcp_service_send_req (uint16_t instance_id, uint8_t options, void *ptr, const uint8_t addr[static 16], uint8_t *msg_ptr, uint16_t msg_len, dhcp_service_receive_resp_cb *receive_resp_cb)
 Sends DHCP request message.
void dhcp_service_set_retry_timers (uint32_t msg_tr_id, uint16_t timeout_init, uint16_t timeout_max, uint8_t retrans_max)
 Setting retransmission parameters.
void dhcp_service_req_remove (uint32_t msg_tr_id)
 Stops transactions for a message (retransmissions).
bool dhcp_service_timer_tick (uint16_t ticks)
 Timer tick function for retransmissions.

Detailed Description

DHCP server connection interfaces.

DHCP Service Instance

DHCP Service Messages

DHCP Service Timers (retry timers)

Definition in file dhcp_service_api.h.

Typedef Documentation

typedef int( dhcp_service_receive_req_cb)(uint16_t instance_id, uint32_t msg_tr_id, uint8_t msg_name, uint8_t *msg_ptr, uint16_t msg_len)

DHCP Service receive callback.

When the DHCP service receives a DHCP message it will go through a list of registered DHCP services instances until some instance acknowledges that the message belongs to it.

Parameters:
instance_idAn instance of registered server.
msg_tr_idThe message transaction ID.
msg_ptrAn allocated message pointer. Should not deallocate unless RET_MSG_ACCEPTED returned (then responsibility of client).
msg_lenThe length of the message.

Return values

Returns:
RET_MSG_ACCEPTED - Message is handled.
RET_MSG_CORRUPTED - Message is corrupted.
RET_MSG_NOT_MINE - Message belongs to someone else.

Definition at line 84 of file dhcp_service_api.h.

typedef int( dhcp_service_receive_resp_cb)(uint16_t instance_id, void *ptr, uint8_t msg_name, uint8_t *msg_ptr, uint16_t msg_len)

DHCP Service Message Response callback.

When the DHCP service receives a response to a DHCP message, this callback receives it.

Parameters:
instance_idAn instance of a registered server.
ptrA pointer for the client object.
msg_ptrAn allocated message pointer. Should not deallocate unless RET_MSG_ACCEPTED returned (then responsibility of client).
msg_lenThe length of the message.

Return values

Returns:
RET_MSG_ACCEPTED - Message is handled
RET_MSG_WAIT_ANOTHER - This message was not the last one for this transaction and a new reply is expected.

Definition at line 101 of file dhcp_service_api.h.

Function Documentation

void dhcp_service_delete ( uint16_t  instance )

Deletes a server instance.

Removes all data related to this instance.

Parameters:
instanceThe instance ID of the registered server.
uint16_t dhcp_service_init ( int8_t  interface_id,
dhcp_instance_type_e  instance_type,
dhcp_service_receive_req_cb *  receive_req_cb 
)

Initialize a new DHCP service instance.

Creates and shares the socket for other DHCP services.

Parameters:
interface_idInterface for the new DHCP instance.
instance_typeThe type of the new DHCP instance.
Acallback function to receive DHCP messages.
Returns:
Instance ID that is used to identify the service.
void dhcp_service_req_remove ( uint32_t  msg_tr_id )

Stops transactions for a message (retransmissions).

Clears off sending retransmissions for a particular message transaction by finding it via its message transaction ID.

Parameters:
msg_tr_idThe message transaction ID.
uint32_t dhcp_service_send_req ( uint16_t  instance_id,
uint8_t  options,
void *  ptr,
const uint8_t  addr[static 16],
uint8_t *  msg_ptr,
uint16_t  msg_len,
dhcp_service_receive_resp_cb *  receive_resp_cb 
)

Sends DHCP request message.

Service takes care of retransmissions.

Parameters:
instance_idThe instance ID of the registered server.
optionsOptions for this request.
ptrA void pointer to the client object.
addrThe address of the server.
msg_ptrAn allocated message pointer. This pointer is the responsibility of the service after this call.
msg_lenThe length of the message.
receive_resp_cbCallback pointer
Returns:
Transaction ID of the DHCP transaction
0, if error occurred.
int dhcp_service_send_resp ( uint32_t  msg_tr_id,
uint8_t  options,
uint8_t *  msg_ptr,
uint16_t  msg_len 
)

Sends a DHCP response message.

Parameters:
msg_tr_idThe message transaction ID.
optionsOptions for this request.
msg_ptrAn allocated message pointer. Should not deallocate unless RET_MSG_ACCEPTED returned (then responsibility of client).
msg_lenThe length of the message.
Returns:
0, if everything went fine.
-1, if error occurred.
void dhcp_service_set_retry_timers ( uint32_t  msg_tr_id,
uint16_t  timeout_init,
uint16_t  timeout_max,
uint8_t  retrans_max 
)

Setting retransmission parameters.

Sets the retransmission parameters for this transaction.

Parameters:
msg_tr_idThe message transaction ID.
timeout_initAn initial timeout value.
timeout_maxThe maximum timeout value when initial timeout is doubled with every retry.
retrans_maxThe maximum number of retries after which an error is received.
bool dhcp_service_timer_tick ( uint16_t  ticks )

Timer tick function for retransmissions.

Retransmission timer ticks should be increased with 100ms interval, if necessary. One tick is one millisecond.

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