int wait_dhcp(int tries) {
fnet_netif_desc_t netif;
struct fnet_dhcp_params dhcp_params;
struct callback_params_t callback_params;
/* Get Default netif */
netif = fnet_netif_get_default();
if (!netif) {
return -1;
}
/* Clear params struct */
fnet_memset_zero(&dhcp_params, sizeof(struct fnet_dhcp_params));
/* Turn on link-local support */
dhcp_params.retries_until_link_local = tries;
/* Initialise DHCP client */
if(fnet_dhcp_init(netif, &dhcp_params) == FNET_ERR) {
return -1;
}
/* Setup param for callbacks */
callback_params.max_tries = tries + 1; /* Add one so we get link local before timeout */
callback_params.cur_try = 1;
callback_params.state = WAITING;
/* Print message */
fnet_printf("\nDHCP: Waiting for server \n");
/* Register call backs */
fnet_dhcp_handler_updated_set(handler_updated, &callback_params);
fnet_dhcp_handler_discover_set(handler_discover, &callback_params);
/* Poll background services until address found or n_tries exceeded */
while (callback_params.state == WAITING) {
fnet_poll_services();
}
/* Now evaluate response */
if (callback_params.state == SUCCESS) {
fnet_printf("DHCP: Success! \n");
return 0; /* Success */
}
else {
fnet_printf("DHCP: Failed! Using link local address \n");
/* Keep DHCP server running in background */
return -1; /* Failure */
}
}
/************************************************************************
* NAME: fapp_dhcp_cmd
*
* DESCRIPTION: Enable DHCP client.
************************************************************************/
void fapp_dhcp_cmd( fnet_shell_desc_t desc, fnet_index_t argc, fnet_char_t ** argv )
{
struct fnet_dhcp_params dhcp_params;
fnet_dhcp_desc_t dhcp_desc;
fnet_netif_desc_t netif = fnet_netif_get_default();
if(argc == 1u /* By default is "init".*/
#if 0 /* DHCP reboot feature not used too much. */
|| fnet_strcasecmp(&FAPP_DHCP_COMMAND_REBOOT[0], argv[1]) == 0
#endif
) /* [reboot] */
{
fnet_memset_zero(&dhcp_params, sizeof(struct fnet_dhcp_params));
fapp_dhcp_discover_counter = FAPP_CFG_DHCP_CMD_DISCOVER_MAX; /* reset counter.*/
#if 0 /* DHCP reboot feature not used too much. */
if(fnet_strcasecmp(&FAPP_DHCP_COMMAND_REBOOT[0], argv[1]) == 0) /* [reboot] */
dhcp_params.requested_ip_address.s_addr = fnet_netif_get_ip4_addr(netif);
#endif
fapp_dhcp_ip_old = fnet_netif_get_ip4_addr(netif); /* Save ip to restore if cancelled. */
/* Enable DHCP client */
dhcp_desc = fnet_dhcp_init(netif, &dhcp_params);
if(dhcp_desc != FNET_ERR)
{
fapp_dhcp_desc = dhcp_desc;
/* Register DHCP event handlers. */
fnet_dhcp_handler_updated_set(fapp_dhcp_desc, fapp_dhcp_handler_updated, (void *)desc);
fnet_dhcp_handler_discover_set(fapp_dhcp_desc, fapp_dhcp_handler_discover, (void *)desc);
fnet_shell_println(desc, FAPP_TOCANCEL_STR);
fnet_shell_block(desc, fapp_dhcp_on_ctrlc); /* Block shell. */
}
else
{
fnet_shell_println(desc, FAPP_INIT_ERR, "DHCP");
}
}
else if((argc == 2u) && (fnet_strcasecmp(&FAPP_COMMAND_RELEASE[0], argv[1]) == 0)) /* [release] */
{
fapp_dhcp_release();
}
else
{
fnet_shell_println(desc, FAPP_PARAM_ERR, argv[1]);
}
}
/************************************************************************
* NAME: fapp_dhcp_handler_updated
*
* DESCRIPTION: Event handler on new IP from DHCP client.
************************************************************************/
static void fapp_dhcp_handler_updated(fnet_dhcp_desc_t dhcp_desc, fnet_netif_desc_t netif, void *shl_desc )
{
fnet_shell_desc_t desc = (fnet_shell_desc_t) shl_desc;
fapp_dhcp_discover_counter = -1; /* Infinite for future. */
/* Optionally, unregister DHCP event handlers, just to do not
* disturb a user. */
fnet_dhcp_handler_updated_set(dhcp_desc, 0, 0);
fnet_dhcp_handler_discover_set(dhcp_desc, 0, 0);
fnet_shell_unblock((fnet_shell_desc_t)shl_desc); /* Unblock the shell. */
/* Print updated parameters info. */
fnet_shell_println( desc, "\n%s", FAPP_DELIMITER_STR);
fnet_shell_println( desc, FAPP_DHCP_NEWIP_STR);
fnet_shell_println( desc, FAPP_DELIMITER_STR);
fapp_netif_info_print( desc, netif );
}
