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The 'do-resolve' action is an http-request or tcp-request content action which allows to run DNS resolution at run time in HAProxy. The name to be resolved can be picked up in the request sent by the client and the result of the resolution is stored in a variable. The time the resolution is being performed, the request is on pause. If the resolution can't provide a suitable result, then the variable will be empty. It's up to the admin to take decisions based on this statement (return 503 to prevent loops). Read carefully the documentation concerning this feature, to ensure your setup is secure and safe to be used in production. This patch creates a global counter to track various errors reported by the action 'do-resolve'.
53 lines
2.1 KiB
C
53 lines
2.1 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/action.h>
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#include <types/dns.h>
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extern struct list dns_resolvers;
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extern unsigned int dns_failed_resolutions;
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struct dns_resolvers *find_resolvers_by_id(const char *id);
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struct dns_srvrq *find_srvrq_by_name(const char *name, struct proxy *px);
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struct dns_srvrq *new_dns_srvrq(struct server *srv, char *fqdn);
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int dns_str_to_dn_label(const char *str, int str_len, char *dn, int dn_len);
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int dns_dn_label_to_str(const char *dn, int dn_len, char *str, int str_len);
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int dns_hostname_validation(const char *string, char **err);
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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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int dns_link_resolution(void *requester, int requester_type, int requester_locked);
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void dns_unlink_resolution(struct dns_requester *requester);
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void dns_trigger_resolution(struct dns_requester *requester);
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enum act_parse_ret dns_parse_do_resolve(const char **args, int *orig_arg, struct proxy *px, struct act_rule *rule, char **err);
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int check_action_do_resolve(struct act_rule *rule, struct proxy *px, char **err);
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#endif // _PROTO_DNS_H
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