uIP hostname resolver functions

The uIP DNS resolver functions are used to lookup a hostname and map it to a numerical IP address. More...

Files
file	resolv.c
	DNS host name to IP address resolver.
Functions
void	resolv_query (const char *name)
	Queues a name so that a question for the name will be sent out.
uip_ipaddr_t *	resolv_lookup (const char *name)
	Look up a hostname in the array of known hostnames.
uip_ipaddr_t *	resolv_getserver (void)
	Obtain the currently configured DNS server.
void	resolv_conf (const uip_ipaddr_t *dnsserver)
	Configure a DNS server.
Variables
process_event_t	resolv_event_found
	Event that is broadcasted when a DNS name has been resolved.

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Detailed Description

The uIP DNS resolver functions are used to lookup a hostname and map it to a numerical IP address.

It maintains a list of resolved hostnames that can be queried with the resolv_lookup() function. New hostnames can be resolved using the resolv_query() function.

The event resolv_event_found is posted when a hostname has been resolved. It is up to the receiving process to determine if the correct hostname has been found by calling the resolv_lookup() function with the hostname.

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Function Documentation

void resolv_conf

(

const uip_ipaddr_t *

dnsserver

)

Configure a DNS server.

Parameters:

dnsserver

A pointer to a 4-byte representation of the IP address of the DNS server to be configured.

Definition at line 509 of file resolv.c.

References process_post(), and uip_ipaddr_copy.

Referenced by main().

uip_ipaddr_t* resolv_getserver

(

void

)

Obtain the currently configured DNS server.

Returns:

A pointer to a 4-byte representation of the IP address of the currently configured DNS server or NULL if no DNS server has been configured.

Definition at line 493 of file resolv.c.

References NULL, and uip_udp_conn::ripaddr.

uip_ipaddr_t* resolv_lookup

(

const char *

name

)

Look up a hostname in the array of known hostnames.

Note:

This function only looks in the internal array of known hostnames, it does not send out a query for the hostname if none was found. The function resolv_query() can be used to send a query for a hostname.

Returns:

A pointer to a 4-byte representation of the hostname's IP address, or NULL if the hostname was not found in the array of hostnames.

Definition at line 467 of file resolv.c.

References NULL.

void resolv_query

(

const char *

name

)

Queues a name so that a question for the name will be sent out.

Parameters:

name	The hostname that is to be queried.

Definition at line 418 of file resolv.c.

References NULL, and tcpip_poll_udp().