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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @addtogroup Networking
* @{
*/
/**
* @file multinetwork.h
*/
#ifndef ANDROID_MULTINETWORK_H
#define ANDROID_MULTINETWORK_H
#include <netdb.h>
#include <stdlib.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
/**
* The corresponding C type for android.net.Network#getNetworkHandle() return
* values. The Java signed long value can be safely cast to a net_handle_t:
*
* [C] ((net_handle_t) java_long_network_handle)
* [C++] static_cast<net_handle_t>(java_long_network_handle)
*
* as appropriate.
*/
typedef uint64_t net_handle_t;
/**
* The value NETWORK_UNSPECIFIED indicates no specific network.
*
* For some functions (documented below), a previous binding may be cleared
* by an invocation with NETWORK_UNSPECIFIED.
*
* Depending on the context it may indicate an error. It is expressly
* not used to indicate some notion of the "current default network".
*/
#define NETWORK_UNSPECIFIED ((net_handle_t)0)
/**
* All functions below that return an int return 0 on success or -1
* on failure with an appropriate errno value set.
*/
#if __ANDROID_API__ >= 23
/**
* Set the network to be used by the given socket file descriptor.
*
* To clear a previous socket binding, invoke with NETWORK_UNSPECIFIED.
*
* This is the equivalent of: [android.net.Network#bindSocket()](https://developer.android.com/reference/android/net/Network.html#bindSocket(java.net.Socket))
*
*/
int android_setsocknetwork(net_handle_t network, int fd) __INTRODUCED_IN(23);
/**
* Binds the current process to |network|. All sockets created in the future
* (and not explicitly bound via android_setsocknetwork()) will be bound to
* |network|. All host name resolutions will be limited to |network| as well.
* Note that if the network identified by |network| ever disconnects, all
* sockets created in this way will cease to work and all host name
* resolutions will fail. This is by design so an application doesn't
* accidentally use sockets it thinks are still bound to a particular network.
*
* To clear a previous process binding, invoke with NETWORK_UNSPECIFIED.
*
* This is the equivalent of: [android.net.ConnectivityManager#setProcessDefaultNetwork()](https://developer.android.com/reference/android/net/ConnectivityManager.html#setProcessDefaultNetwork(android.net.Network))
*
*/
int android_setprocnetwork(net_handle_t network) __INTRODUCED_IN(23);
/**
* Perform hostname resolution via the DNS servers associated with |network|.
*
* All arguments (apart from |network|) are used identically as those passed
* to getaddrinfo(3). Return and error values are identical to those of
* getaddrinfo(3), and in particular gai_strerror(3) can be used as expected.
* Similar to getaddrinfo(3):
* - |hints| may be NULL (in which case man page documented defaults apply)
* - either |node| or |service| may be NULL, but not both
* - |res| must not be NULL
*
* This is the equivalent of: [android.net.Network#getAllByName()](https://developer.android.com/reference/android/net/Network.html#getAllByName(java.lang.String))
*
*/
int android_getaddrinfofornetwork(net_handle_t network,
const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res) __INTRODUCED_IN(23);
#endif /* __ANDROID_API__ >= 23 */
#if __ANDROID_API__ >= 29
/**
* Possible values of the flags argument to android_res_nsend and android_res_nquery.
* Values are ORed together.
*/
enum ResNsendFlags : uint32_t {
/**
* Send a single request to a single resolver and fail on timeout or network errors
*/
ANDROID_RESOLV_NO_RETRY = 1 << 0,
/**
* Do not cache the result of the lookup. The lookup may return a result that is already
* in the cache, unless the ANDROID_RESOLV_NO_CACHE_LOOKUP flag is also specified.
*/
ANDROID_RESOLV_NO_CACHE_STORE = 1 << 1,
/**
* Don't lookup the request in cache.
*/
ANDROID_RESOLV_NO_CACHE_LOOKUP = 1 << 2,
};
/**
* Look up the {|ns_class|, |ns_type|} Resource Record (RR) associated
* with Domain Name |dname| on the given |network|.
* The typical value for |ns_class| is ns_c_in, while |type| can be any
* record type (for instance, ns_t_aaaa or ns_t_txt).
* |flags| is a additional config to control actual querying behavior, see
* ResNsendFlags for detail.
*
* Returns a file descriptor to watch for read events, or a negative
* POSIX error code (see errno.h) if an immediate error occurs.
*/
int android_res_nquery(net_handle_t network,
const char *dname, int ns_class, int ns_type, uint32_t flags) __INTRODUCED_IN(29);
/**
* Issue the query |msg| on the given |network|.
* |flags| is a additional config to control actual querying behavior, see
* ResNsendFlags for detail.
*
* Returns a file descriptor to watch for read events, or a negative
* POSIX error code (see errno.h) if an immediate error occurs.
*/
int android_res_nsend(net_handle_t network,
const uint8_t *msg, size_t msglen, uint32_t flags) __INTRODUCED_IN(29);
/**
* Read a result for the query associated with the |fd| descriptor.
* Closes |fd| before returning.
*
* Returns:
* < 0: negative POSIX error code (see errno.h for possible values). |rcode| is not set.
* >= 0: length of |answer|. |rcode| is the resolver return code (e.g., ns_r_nxdomain)
*/
int android_res_nresult(int fd,
int *rcode, uint8_t *answer, size_t anslen) __INTRODUCED_IN(29);
/**
* Attempts to cancel the in-progress query associated with the |nsend_fd|
* descriptor.
*/
void android_res_cancel(int nsend_fd) __INTRODUCED_IN(29);
#endif /* __ANDROID_API__ >= 29 */
__END_DECLS
#endif // ANDROID_MULTINETWORK_H
/** @} */
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