| /* $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 <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 { |
| 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 |
| uint16_t id; // current message id |
| 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; // 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; |
| // clang-format on |
| }; |
| |
| // 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) { |
| 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); |
| } |
| } |
| |
| if (fchown(sock, uid, -1) == -1) { |
| LOG(WARNING) << "Failed to chown socket: " << strerror(errno); |
| } |
| } |
| |
| inline std::string addrToString(const sockaddr_storage* addr) { |
| char out[INET6_ADDRSTRLEN] = {0}; |
| getnameinfo((const sockaddr*)addr, sizeof(sockaddr_storage), out, INET6_ADDRSTRLEN, nullptr, 0, |
| NI_NUMERICHOST); |
| return std::string(out); |
| } |