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https://github.com/logicog/RTLPlayground.git
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DrDoof
67b8c718fb
A small resolver for IPv4 address records, so that clients such as NTP can be given a host name: "dns server <ip> [<ip>]", "dns lookup <name>" and "dns". Without a configured server it uses the one DHCP handed out. A query goes to the servers in turn every two seconds and gives up after six tries; answers with compressed names and CNAME records ahead of the address are understood. A name that already is a dotted address is taken without a query. The resolver sits in BANK3, the command line in BANK2 next to the helpers it uses. The System page shows and sets the servers.
37 lines
938 B
C
37 lines
938 B
C
#ifndef _DNS_H_
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#define _DNS_H_
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#include <stdint.h>
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#define DNS_NAME_LEN 48
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#define DNS_IDLE 0
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#define DNS_PENDING 1
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#define DNS_DONE 2
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#define DNS_FAILED 3
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struct uip_udp_conn;
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struct dns_state {
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uint8_t server[2][4]; /* configured servers, 0.0.0.0 = unused */
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char name[DNS_NAME_LEN]; /* name of the current or last lookup */
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uint8_t addr[4]; /* address found by the last lookup */
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uint8_t status; /* DNS_* */
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uint8_t verbose; /* print the result of the lookup */
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uint8_t tries; /* queries sent for the current lookup */
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uint8_t send; /* a query is due on the connection */
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uint16_t id;
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uint32_t sent; /* ticks when the last query went out */
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struct uip_udp_conn *conn;
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};
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extern __xdata struct dns_state dns_state;
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void dns_init(void) __banked;
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void dns_lookup(void) __banked;
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void dns_show(void) __banked;
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void dns_callback(uint16_t lport) __banked __reentrant;
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void dns_parse(void) __banked __reentrant;
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#endif
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