01e37c9665
Group network context elements in to a single struct and add a version of android_getaddrinfofornet() that accepts it. The introduction of UID-based routing means that the UID is an integral part of the network context when evaluating connectivity, sorting addresses, etc. Also, introduce a distinction between DNS netids/marks and those expected to be used by the application. This can be important when the network an application is using is not the same as the network on which DNS queries will be issued. Additionally, de-duplicate the UDP connect logic (collapse both _test_connect() and _find_src_addr() into just the latter). Bug: 19470192 Bug: 20733156 Bug: 21832279 Change-Id: If16c2f4744695f507993afdac078ca105eb5d3e4
109 lines
4.3 KiB
C
109 lines
4.3 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 <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 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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} __attribute__((packed));
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#define NET_CONTEXT_INVALID_UID ((uid_t)-1)
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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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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 void _resolv_set_nameservers_for_net(unsigned netid,
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const char** servers, int numservers, const char *domains) __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_gethostbyaddrfornet_proxy(const void *, socklen_t, int , unsigned, unsigned) __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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FILE* android_open_proxy(void) __LIBC_HIDDEN__;
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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);
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__END_DECLS
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#endif /* _RESOLV_NETID_H */
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