You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
214 lines
8.6 KiB
214 lines
8.6 KiB
/* $NetBSD: resolv.h,v 1.31 2005/12/26 19:01:47 perry Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1983, 1987, 1989
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
|
|
* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
|
|
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <android-base/logging.h>
|
|
#include <android-base/unique_fd.h>
|
|
#include <private/android_filesystem_config.h> // AID_DNS
|
|
|
|
#include <net/if.h>
|
|
#include <time.h>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "DnsResolver.h"
|
|
#include "netd_resolv/resolv.h"
|
|
#include "params.h"
|
|
#include "stats.pb.h"
|
|
|
|
// Linux defines MAXHOSTNAMELEN as 64, while the domain name limit in
|
|
// RFC 1034 and RFC 1035 is 255 octets.
|
|
#ifdef MAXHOSTNAMELEN
|
|
#undef MAXHOSTNAMELEN
|
|
#endif
|
|
#define MAXHOSTNAMELEN 256
|
|
|
|
/*
|
|
* Global defines and variables for resolver stub.
|
|
*/
|
|
#define RES_TIMEOUT 5000 /* min. milliseconds between retries */
|
|
#define RES_DFLRETRY 2 /* Default #/tries. */
|
|
|
|
// Flags for res_state->_flags
|
|
#define RES_F_VC 0x00000001 // socket is TCP
|
|
#define RES_F_EDNS0ERR 0x00000004 // EDNS0 caused errors
|
|
|
|
// Holds either a sockaddr_in or a sockaddr_in6.
|
|
union sockaddr_union {
|
|
struct sockaddr sa;
|
|
struct sockaddr_in sin;
|
|
struct sockaddr_in6 sin6;
|
|
};
|
|
constexpr int MAXPACKET = 8 * 1024;
|
|
|
|
struct ResState {
|
|
ResState(const android_net_context* netcontext, android::net::NetworkDnsEventReported* dnsEvent)
|
|
: netid(netcontext->dns_netid),
|
|
uid(netcontext->uid),
|
|
pid(netcontext->pid),
|
|
_mark(netcontext->dns_mark),
|
|
event(dnsEvent),
|
|
netcontext_flags(netcontext->flags) {}
|
|
|
|
ResState clone(android::net::NetworkDnsEventReported* dnsEvent = nullptr) {
|
|
// TODO: Separate non-copyable members to other structures and let default copy
|
|
// constructor do its work for below copyable members.
|
|
ResState copy;
|
|
copy.netid = netid;
|
|
copy.uid = uid;
|
|
copy.pid = pid;
|
|
copy.search_domains = search_domains;
|
|
copy.nsaddrs = nsaddrs;
|
|
copy.ndots = ndots;
|
|
copy._mark = _mark;
|
|
copy._flags = _flags;
|
|
copy.event = (dnsEvent == nullptr) ? event : dnsEvent;
|
|
copy.netcontext_flags = netcontext_flags;
|
|
copy.tc_mode = tc_mode;
|
|
copy.enforce_dns_uid = enforce_dns_uid;
|
|
copy.sort_nameservers = sort_nameservers;
|
|
return copy;
|
|
}
|
|
void closeSockets() {
|
|
tcp_nssock.reset();
|
|
_flags &= ~RES_F_VC;
|
|
|
|
for (auto& sock : nssocks) {
|
|
sock.reset();
|
|
}
|
|
}
|
|
|
|
int nameserverCount() { return nsaddrs.size(); }
|
|
|
|
// clang-format off
|
|
unsigned netid; // NetId: cache key and socket mark
|
|
uid_t uid; // uid of the app that sent the DNS lookup
|
|
pid_t pid; // pid of the app that sent the DNS lookup
|
|
std::vector<std::string> search_domains{}; // domains to search
|
|
std::vector<android::netdutils::IPSockAddr> nsaddrs;
|
|
android::base::unique_fd nssocks[MAXNS]; // UDP sockets to nameservers
|
|
unsigned ndots : 4 = 1; // threshold for initial abs. query
|
|
unsigned _mark; // If non-0 SET_MARK to _mark on all request sockets
|
|
android::base::unique_fd tcp_nssock; // TCP socket (but why not one per nameserver?)
|
|
uint32_t _flags = 0; // See RES_F_* defines below
|
|
android::net::NetworkDnsEventReported* event;
|
|
uint32_t netcontext_flags;
|
|
int tc_mode = 0;
|
|
bool enforce_dns_uid = false;
|
|
bool sort_nameservers = false; // A flag to indicate whether nsaddrs has been
|
|
// sorted or not.
|
|
// clang-format on
|
|
private:
|
|
ResState() {}
|
|
};
|
|
|
|
// TODO: remove these legacy aliases
|
|
typedef ResState* res_state;
|
|
|
|
/* End of stats related definitions */
|
|
|
|
/*
|
|
* Error code extending h_errno codes defined in bionic/libc/include/netdb.h.
|
|
*
|
|
* This error code, including legacy h_errno, is returned from res_nquery(), res_nsearch(),
|
|
* res_nquerydomain(), res_queryN(), res_searchN() and res_querydomainN() for DNS metrics.
|
|
*
|
|
* TODO: Consider mapping legacy and extended h_errno into a unified resolver error code mapping.
|
|
*/
|
|
#define NETD_RESOLV_H_ERRNO_EXT_TIMEOUT RCODE_TIMEOUT
|
|
|
|
extern const char* const _res_opcodes[];
|
|
|
|
int res_nameinquery(const char*, int, int, const uint8_t*, const uint8_t*);
|
|
int res_queriesmatch(const uint8_t*, const uint8_t*, const uint8_t*, const uint8_t*);
|
|
|
|
int res_nquery(res_state, const char*, int, int, uint8_t*, int, int*);
|
|
int res_nsearch(res_state, const char*, int, int, uint8_t*, int, int*);
|
|
int res_nquerydomain(res_state, const char*, const char*, int, int, uint8_t*, int, int*);
|
|
int res_nmkquery(int op, const char* qname, int cl, int type, const uint8_t* data, int datalen,
|
|
uint8_t* buf, int buflen, int netcontext_flags);
|
|
int res_nsend(res_state statp, const uint8_t* buf, int buflen, uint8_t* ans, int anssiz, int* rcode,
|
|
uint32_t flags, std::chrono::milliseconds sleepTimeMs = {});
|
|
int res_nopt(res_state, int, uint8_t*, int, int);
|
|
|
|
int getaddrinfo_numeric(const char* hostname, const char* servname, addrinfo hints,
|
|
addrinfo** result);
|
|
|
|
// Helper function for converting h_errno to the error codes visible to netd
|
|
int herrnoToAiErrno(int herrno);
|
|
|
|
// switch resolver log severity
|
|
android::base::LogSeverity logSeverityStrToEnum(const std::string& logSeverityStr);
|
|
|
|
template <typename Dest>
|
|
Dest saturate_cast(int64_t x) {
|
|
using DestLimits = std::numeric_limits<Dest>;
|
|
if (x > DestLimits::max()) return DestLimits::max();
|
|
if (x < DestLimits::min()) return DestLimits::min();
|
|
return static_cast<Dest>(x);
|
|
}
|
|
|
|
android::net::NsType getQueryType(const uint8_t* msg, size_t msgLen);
|
|
|
|
android::net::IpVersion ipFamilyToIPVersion(int ipFamily);
|
|
|
|
inline void resolv_tag_socket(int sock, uid_t uid, pid_t pid) {
|
|
// This is effectively equivalent to testing for R+
|
|
if (android::net::gResNetdCallbacks.tagSocket != nullptr) {
|
|
if (int err = android::net::gResNetdCallbacks.tagSocket(sock, TAG_SYSTEM_DNS, uid, pid)) {
|
|
LOG(WARNING) << "Failed to tag socket: " << strerror(-err);
|
|
}
|
|
}
|
|
|
|
// fchown() apps' uid only in R+, since it's incompatible with Q's ebpf vpn isolation feature.
|
|
if (fchown(sock, (android::net::gApiLevel >= 30) ? uid : AID_DNS, -1) == -1) {
|
|
PLOG(WARNING) << "Failed to chown socket";
|
|
}
|
|
}
|