| /* $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. |
| */ |
| |
| /* |
| * @(#)resolv.h 8.1 (Berkeley) 6/2/93 |
| * Id: resolv.h,v 1.7.2.11.4.2 2004/06/25 00:41:05 marka Exp |
| */ |
| |
| #ifndef NETD_RESOLV_PRIVATE_H |
| #define NETD_RESOLV_PRIVATE_H |
| |
| #include <android-base/logging.h> |
| #include <net/if.h> |
| #include <resolv.h> |
| #include <time.h> |
| #include <string> |
| #include <vector> |
| |
| #include "DnsResolver.h" |
| #include "netd_resolv/params.h" |
| #include "netd_resolv/resolv.h" |
| #include "netd_resolv/stats.h" |
| #include "resolv_static.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 MAXRESOLVSORT 10 /* number of net to sort on */ |
| #define RES_MAXNDOTS 15 /* should reflect bit field size */ |
| #define RES_DFLRETRY 2 /* Default #/tries. */ |
| #define RES_MAXTIME 65535 /* Infinity, in milliseconds. */ |
| |
| struct res_state_ext; |
| |
| struct __res_state { |
| unsigned netid; // NetId: cache key and socket mark |
| uid_t uid; // uid of the app that sent the DNS lookup |
| u_long options; // option flags - see below. |
| int nscount; // number of name srvers |
| struct sockaddr_in nsaddr_list[MAXNS]; // address of name server |
| #define nsaddr nsaddr_list[0] // for backward compatibility |
| u_short id; // current message id |
| std::vector<std::string> search_domains; // domains to search |
| unsigned ndots : 4; // threshold for initial abs. query |
| unsigned nsort : 4; // number of elements in sort_list[] |
| char unused[3]; |
| struct { |
| struct in_addr addr; |
| uint32_t mask; |
| } sort_list[MAXRESOLVSORT]; |
| unsigned _mark; /* If non-0 SET_MARK to _mark on all request sockets */ |
| int _vcsock; /* PRIVATE: for res_send VC i/o */ |
| u_int _flags; /* PRIVATE: see below */ |
| u_int _pad; /* make _u 64 bit aligned */ |
| union { |
| /* On an 32-bit arch this means 512b total. */ |
| char pad[72 - 4 * sizeof(int) - 2 * sizeof(void*)]; |
| struct { |
| uint16_t nscount; |
| uint16_t nstimes[MAXNS]; /* ms. */ |
| int nssocks[MAXNS]; |
| struct res_state_ext* ext; /* extention for IPv6 */ |
| } _ext; |
| } _u; |
| struct res_static rstatic[1]; |
| android::net::NetworkDnsEventReported* event; |
| uint32_t netcontext_flags; |
| }; |
| |
| typedef struct __res_state* res_state; |
| |
| // Holds either a sockaddr_in or a sockaddr_in6. |
| typedef union sockaddr_union { |
| struct sockaddr sa; |
| struct sockaddr_in sin; |
| struct sockaddr_in6 sin6; |
| } sockaddr_union; |
| |
| /* Retrieve a local copy of the stats for the given netid. The buffer must have space for |
| * MAXNS __resolver_stats. Returns the revision id of the resolvers used. |
| */ |
| int resolv_cache_get_resolver_stats(unsigned netid, res_params* params, res_stats stats[MAXNS]); |
| |
| /* Add a sample to the shared struct for the given netid and server, provided that the |
| * revision_id of the stored servers has not changed. |
| */ |
| void _resolv_cache_add_resolver_stats_sample(unsigned netid, int revision_id, int ns, |
| const res_sample* sample, int max_samples); |
| |
| // Calculate the round-trip-time from start time t0 and end time t1. |
| int _res_stats_calculate_rtt(const timespec* t1, const timespec* t0); |
| |
| // Create a sample for calculating server reachability statistics. |
| void _res_stats_set_sample(res_sample* sample, time_t now, int rcode, int rtt); |
| |
| /* End of stats related definitions */ |
| |
| // Flags for res_state->_flags |
| #define RES_F_VC 0x00000001 // socket is TCP |
| #define RES_F_EDNS0ERR 0x00000004 // EDNS0 caused errors |
| |
| /* |
| * 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[]; |
| |
| /* Things involving an internal (static) resolver context. */ |
| struct __res_state* res_get_state(void); |
| |
| int res_hnok(const char*); |
| int res_ownok(const char*); |
| int res_mailok(const char*); |
| int res_dnok(const char*); |
| int dn_skipname(const u_char*, const u_char*); |
| void putlong(uint32_t, u_char*); |
| void putshort(uint16_t, u_char*); |
| |
| // Thread-unsafe functions returning pointers to static buffers :-( |
| // TODO: switch all res_debug to std::string |
| const char* p_class(int); |
| const char* p_type(int); |
| const char* p_rcode(int); |
| const char* p_section(int, int); |
| |
| int res_nameinquery(const char*, int, int, const u_char*, const u_char*); |
| int res_queriesmatch(const u_char*, const u_char*, const u_char*, const u_char*); |
| /* Things involving a resolver context. */ |
| int res_ninit(res_state); |
| void res_pquery(const u_char*, int); |
| |
| int res_nquery(res_state, const char*, int, int, u_char*, int, int*); |
| int res_nsearch(res_state, const char*, int, int, u_char*, int, int*); |
| int res_nquerydomain(res_state, const char*, const char*, int, int, u_char*, int, int*); |
| int res_nmkquery(res_state, int, const char*, int, int, const u_char*, int, const u_char*, u_char*, |
| int); |
| int res_nsend(res_state, const u_char*, int, u_char*, int, int*, uint32_t); |
| void res_nclose(res_state); |
| int res_nopt(res_state, int, u_char*, int, int); |
| void res_ndestroy(res_state); |
| void res_setservers(res_state, const sockaddr_union*, int); |
| int res_getservers(res_state, sockaddr_union*, int); |
| |
| struct android_net_context; /* forward */ |
| void res_setnetcontext(res_state, const struct android_net_context*, |
| android::net::NetworkDnsEventReported* event); |
| |
| 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) { |
| if (android::net::gResNetdCallbacks.tagSocket != nullptr) { |
| if (int err = android::net::gResNetdCallbacks.tagSocket(sock, TAG_SYSTEM_DNS, uid)) { |
| LOG(WARNING) << "Failed to tag socket: " << strerror(-err); |
| } |
| } |
| |
| if (fchown(sock, uid, -1) == -1) { |
| LOG(WARNING) << "Failed to chown socket: " << strerror(errno); |
| } |
| } |
| |
| #endif // NETD_RESOLV_PRIVATE_H |