081db840be
When multiple rules exist covering a given uid the one added most recently will be used. This allows us to handle the simultaneous tuns case where a new tun is coming online for an already running VPN. _resolv_clear_iface_for_uid_range now also takes the iface and removes only that matching (iface, uid range) entry. Bug: 12134439 Change-Id: I9b9cfcfae2f38c409022a8c76ccadad7e2babd78
107 lines
4.7 KiB
C
107 lines
4.7 KiB
C
/*
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* Copyright (C) 2011 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_IFACE_H
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#define _RESOLV_IFACE_H
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/* This header contains declarations related to per-interface 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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* NOTE: <resolv.h> contains the same declarations, this will be removed
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* when we change system/netd to use this header instead.
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*/
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#include <sys/cdefs.h>
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#include <netinet/in.h>
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__BEGIN_DECLS
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/* Use a guard macro until we remove the same definitions from <resolv.h> */
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#ifndef _BIONIC_RESOLV_IFACE_FUNCTIONS_DECLARED
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#define _BIONIC_RESOLV_IFACE_FUNCTIONS_DECLARED
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/* Set name of default interface */
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extern void _resolv_set_default_iface(const char* ifname);
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/* set name servers for an interface */
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extern void _resolv_set_nameservers_for_iface(const char* ifname, const char** servers, int numservers,
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const char *domains);
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/* tell resolver of the address of an interface */
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extern void _resolv_set_addr_of_iface(const char* ifname, struct in_addr* addr);
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/* flush the cache associated with the default interface */
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extern void _resolv_flush_cache_for_default_iface();
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/* flush the cache associated with a certain interface */
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extern void _resolv_flush_cache_for_iface(const char* ifname);
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/* set a pid to use the name servers of the specified interface */
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extern void _resolv_set_iface_for_pid(const char* ifname, int pid);
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/* clear pid from being associated with an interface */
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extern void _resolv_clear_iface_for_pid(int pid);
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/* clear the entire mapping of pids to interfaces. */
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extern void _resolv_clear_iface_pid_mapping();
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/** Gets the name of the interface to which the pid is attached.
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* On error, -1 is returned.
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* If no interface is found, 0 is returned and buff is set to empty ('\0').
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* If an interface is found, the name is copied to buff and the length of the name is returned.
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* Arguments: pid The pid to find an interface for
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* buff A buffer to copy the result to
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* buffLen Length of buff. An interface is at most IF_NAMESIZE in length */
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extern int _resolv_get_pids_associated_interface(int pid, char* buff, int buffLen);
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/** set a uid range to use the name servers of the specified interface */
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extern int _resolv_set_iface_for_uid_range(const char* ifname, int uid_start, int uid_end);
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/** Remove a mapping added by _resolv_set_iface_for_uid_range.
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* If no such rule exists -1 is returned. */
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extern int _resolv_clear_iface_for_uid_range(const char* ifname, int uid_start, int uid_end);
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/* clear the entire mapping of uid ranges to interfaces. */
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extern void _resolv_clear_iface_uid_range_mapping();
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/** Gets the name of the interface to which the uid is attached.
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* On error, -1 is returned.
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* If no interface is found, 0 is returned and buff is set to empty ('\0').
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* If an interface is found, the name is copied to buff and the length of the name is returned.
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* If there are multiple rules covering uid the most recently added rule will be returned.
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* Arguments: uid The uid to find an interface for
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* buff A buffer to copy the result to
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* buffLen Length of buff. An interface is at most IF_NAMESIZE in length */
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extern int _resolv_get_uids_associated_interface(int uid, char* buff, int buffLen);
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#endif /* _BIONIC_RESOLV_IFACE_FUNCTIONS_DECLARED */
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__END_DECLS
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#endif /* _RESOLV_IFACE_H */
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