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fa4a663095
Introduction of a DNS response LRU cache in HAProxy. When a positive response is received from a DNS server, HAProxy stores it in the struct resolution and then also populates a LRU cache with the response. For now, the key in the cache is a XXHASH64 of the hostname in the domain name format concatened to the query type in string format.
55 lines
2.6 KiB
C
55 lines
2.6 KiB
C
/*
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* include/proto/dns.h
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* This file provides functions related to DNS protocol
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*
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* Copyright (C) 2014 Baptiste Assmann <bedis9@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_DNS_H
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#define _PROTO_DNS_H
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#include <types/dns.h>
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#include <types/proto_udp.h>
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char *dns_str_to_dn_label(const char *string, char *dn, int dn_len);
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int dns_str_to_dn_label_len(const char *string);
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int dns_hostname_validation(const char *string, char **err);
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int dns_build_query(int query_id, int query_type, char *hostname_dn, int hostname_dn_len, char *buf, int bufsize);
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struct task *dns_process_resolve(struct task *t);
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int dns_init_resolvers(int close_socket);
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uint16_t dns_rnd16(void);
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int dns_validate_dns_response(unsigned char *resp, unsigned char *bufend, struct dns_resolution *resolution);
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int dns_get_ip_from_response(struct dns_response_packet *dns_p,
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struct dns_options *dns_opts, void *currentip,
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short currentip_sin_family,
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void **newip, short *newip_sin_family,
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void *owner);
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void dns_resolve_send(struct dgram_conn *dgram);
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void dns_resolve_recv(struct dgram_conn *dgram);
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int dns_send_query(struct dns_resolution *resolution);
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void dns_print_current_resolutions(struct dns_resolvers *resolvers);
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void dns_update_resolvers_timeout(struct dns_resolvers *resolvers);
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void dns_reset_resolution(struct dns_resolution *resolution);
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int dns_check_resolution_queue(struct dns_resolvers *resolvers);
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unsigned short dns_response_get_query_id(unsigned char *resp);
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struct dns_resolution *dns_alloc_resolution(void);
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void dns_free_resolution(struct dns_resolution *resolution);
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struct chunk *dns_cache_key(int query_type, char *hostname_dn, int hostname_dn_len, struct chunk *buf);
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struct lru64 *dns_cache_lookup(int query_type, char *hostname_dn, int hostname_dn_len, int valid_period, void *cache_domain);
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#endif // _PROTO_DNS_H
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