114 lines
4.6 KiB
C
114 lines
4.6 KiB
C
/*
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* Copyright (C) 2014 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _RESOLV_NETID_H
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#define _RESOLV_NETID_H
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/* This header contains declarations related to per-network DNS
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* server selection. They are used by system/netd/ and should not be
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* exposed by the C library's public NDK headers.
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*/
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#include <sys/cdefs.h>
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#include <netinet/in.h>
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#include "resolv_params.h"
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#include <stdio.h>
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/*
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* Passing NETID_UNSET as the netId causes system/netd/server/DnsProxyListener.cpp to
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* fill in the appropriate default netId for the query.
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*/
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#define NETID_UNSET 0u
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/*
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* MARK_UNSET represents the default (i.e. unset) value for a socket mark.
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*/
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#define MARK_UNSET 0u
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__BEGIN_DECLS
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struct __res_params;
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struct addrinfo;
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#define __used_in_netd __attribute__((visibility ("default")))
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/*
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* A struct to capture context relevant to network operations.
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*
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* Application and DNS netids/marks can differ from one another under certain
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* circumstances, notably when a VPN applies to the given uid's traffic but the
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* VPN network does not have its own DNS servers explicitly provisioned.
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*
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* The introduction of per-UID routing means the uid is also an essential part
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* of the evaluation context. Its proper uninitialized value is
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* NET_CONTEXT_INVALID_UID.
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*/
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struct android_net_context {
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unsigned app_netid;
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unsigned app_mark;
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unsigned dns_netid;
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unsigned dns_mark;
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uid_t uid;
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unsigned flags;
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res_send_qhook qhook;
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};
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#define NET_CONTEXT_INVALID_UID ((uid_t)-1)
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#define NET_CONTEXT_FLAG_USE_LOCAL_NAMESERVERS 0x00000001
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#define NET_CONTEXT_FLAG_USE_EDNS 0x00000002
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struct hostent *android_gethostbyaddrfornet(const void *, socklen_t, int, unsigned, unsigned) __used_in_netd;
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struct hostent *android_gethostbynamefornet(const char *, int, unsigned, unsigned) __used_in_netd;
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int android_getaddrinfofornet(const char *, const char *, const struct addrinfo *, unsigned,
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unsigned, struct addrinfo **) __used_in_netd;
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/*
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* TODO: consider refactoring android_getaddrinfo_proxy() to serve as an
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* explore_fqdn() dispatch table method, with the below function only making DNS calls.
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*/
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struct hostent *android_gethostbyaddrfornetcontext(const void *, socklen_t, int, const struct android_net_context *) __used_in_netd;
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struct hostent *android_gethostbynamefornetcontext(const char *, int, const struct android_net_context *) __used_in_netd;
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int android_getaddrinfofornetcontext(const char *, const char *, const struct addrinfo *,
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const struct android_net_context *, struct addrinfo **) __used_in_netd;
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/* set name servers for a network */
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extern int _resolv_set_nameservers_for_net(unsigned netid, const char** servers,
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unsigned numservers, const char *domains, const struct __res_params* params) __used_in_netd;
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/* flush the cache associated with a certain network */
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extern void _resolv_flush_cache_for_net(unsigned netid) __used_in_netd;
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/* delete the cache associated with a certain network */
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extern void _resolv_delete_cache_for_net(unsigned netid) __used_in_netd;
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/* Internal use only. */
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struct hostent *android_gethostbyaddrfornetcontext_proxy(const void *, socklen_t, int , const struct android_net_context *) __LIBC_HIDDEN__;
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int android_getnameinfofornet(const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int, unsigned, unsigned) __LIBC_HIDDEN__;
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__END_DECLS
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#endif /* _RESOLV_NETID_H */
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