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https://github.com/haproxy/haproxy.git
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729c901c3f
Prior this patch, the DNS responses were stored in a pre-allocated memory area (allocated at HAProxy's startup). The problem is that this memory is erased for each new DNS responses received and processed. This patch removes the global memory allocation (which was not thread safe by the way) and introduces a storage of the dns response in the struct resolution. The memory in the struct resolution is also reserved at start up and is thread safe, since each resolution structure will have its own memory area. For now, we simply store the response and use it atomically per response per server.
52 lines
2.3 KiB
C
52 lines
2.3 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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#endif // _PROTO_DNS_H
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