| /* $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 <net/if.h> |
| #include <resolv.h> |
| #include <time.h> |
| |
| #include "netd_resolv/params.h" |
| #include "netd_resolv/resolv.h" |
| #include "netd_resolv/stats.h" |
| #include "resolv_static.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 |
| |
| /* |
| * This used to be defined in res_query.c, now it's in herror.c. |
| * [XXX no it's not. It's in irs/irs_data.c] |
| * It was |
| * never extern'd by any *.h file before it was placed here. For thread |
| * aware programs, the last h_errno value set is stored in res->h_errno. |
| * |
| * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO |
| * (and __h_errno_set) to the public via <resolv.h>. |
| * XXX: __h_errno_set is really part of IRS, not part of the resolver. |
| * If somebody wants to build and use a resolver that doesn't use IRS, |
| * what do they do? Perhaps something like |
| * #ifdef WANT_IRS |
| * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x) |
| * #else |
| * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x)) |
| * #endif |
| */ |
| |
| #define RES_SET_H_ERRNO(r, x) (h_errno = (r)->res_h_errno = (x)) |
| |
| /* |
| * Global defines and variables for resolver stub. |
| */ |
| #define MAXDFLSRCH 3 /* # default domain levels to try */ |
| #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ |
| |
| #define RES_TIMEOUT 5 /* min. seconds between retries */ |
| #define MAXRESOLVSORT 10 /* number of net to sort on */ |
| #define RES_MAXNDOTS 15 /* should reflect bit field size */ |
| #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */ |
| #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */ |
| #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 */ |
| int retrans; /* retransmission time interval */ |
| int retry; /* number of times to retransmit */ |
| 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 */ |
| char* dnsrch[MAXDNSRCH + 1]; /* components of domain to search */ |
| char defdname[256]; /* default domain (deprecated) */ |
| u_long pfcode; /* RES_PRF_ flags - see below. */ |
| 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]; |
| int res_h_errno; /* last one set for this context */ |
| 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]; |
| bool use_local_nameserver; /* DNS-over-TLS bypass */ |
| }; |
| |
| typedef struct __res_state* res_state; |
| |
| /* 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 */ |
| |
| /* |
| * Resolver flags (used to be discrete per-module statics ints). |
| */ |
| #define RES_F_VC 0x00000001 /* socket is TCP */ |
| #define RES_F_CONN 0x00000002 /* socket is connected */ |
| #define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */ |
| #define RES_F__UNUSED 0x00000008 /* (unused) */ |
| #define RES_F_LASTMASK 0x000000F0 /* ordinal server of last res_nsend */ |
| #define RES_F_LASTSHIFT 4 /* bit position of LASTMASK "flag" */ |
| #define RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT) |
| |
| /* res_findzonecut2() options */ |
| #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */ |
| #define RES_IPV4ONLY 0x00000002 /* IPv4 only */ |
| #define RES_IPV6ONLY 0x00000004 /* IPv6 only */ |
| |
| /* |
| * Resolver options (keep these in synch with res_debug.c, please) |
| */ |
| #define RES_INIT 0x00000001 /* address initialized */ |
| #define RES_DEBUG 0x00000002 /* print debug messages */ |
| #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ |
| #define RES_USEVC 0x00000008 /* use virtual circuit */ |
| #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ |
| #define RES_IGNTC 0x00000020 /* ignore trucation errors */ |
| #define RES_RECURSE 0x00000040 /* recursion desired */ |
| #define RES_DEFNAMES 0x00000080 /* use default domain name */ |
| #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ |
| #define RES_DNSRCH 0x00000200 /* search up local domain tree */ |
| #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ |
| #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ |
| #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ |
| #define RES_ROTATE 0x00004000 /* rotate ns list after each query */ |
| #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */ |
| #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */ |
| #define RES_BLAST 0x00020000 /* blast all recursive servers */ |
| #define RES_NOTLDQUERY 0x00100000 /* don't unqualified name as a tld */ |
| #define RES_USE_DNSSEC 0x00200000 /* use DNSSEC using OK bit in OPT */ |
| /* #define RES_DEBUG2 0x00400000 */ /* nslookup internal */ |
| /* KAME extensions: use higher bit to avoid conflict with ISC use */ |
| #define RES_USE_DNAME 0x10000000 /* use DNAME */ |
| #define RES_USE_EDNS0 0x40000000 /* use EDNS0 if configured */ |
| #define RES_NO_NIBBLE2 0x80000000 /* disable alternate nibble lookup */ |
| |
| #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH | RES_NO_NIBBLE2) |
| |
| /* |
| * Resolver "pfcode" values. Used by dig. |
| */ |
| #define RES_PRF_STATS 0x00000001 |
| #define RES_PRF_UPDATE 0x00000002 |
| #define RES_PRF_CLASS 0x00000004 |
| #define RES_PRF_CMD 0x00000008 |
| #define RES_PRF_QUES 0x00000010 |
| #define RES_PRF_ANS 0x00000020 |
| #define RES_PRF_AUTH 0x00000040 |
| #define RES_PRF_ADD 0x00000080 |
| #define RES_PRF_HEAD1 0x00000100 |
| #define RES_PRF_HEAD2 0x00000200 |
| #define RES_PRF_TTLID 0x00000400 |
| #define RES_PRF_HEADX 0x00000800 |
| #define RES_PRF_QUERY 0x00001000 |
| #define RES_PRF_REPLY 0x00002000 |
| #define RES_PRF_INIT 0x00004000 |
| #define RES_PRF_TRUNC 0x00008000 |
| /* 0x00010000 */ |
| |
| 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*); |
| const char* p_class(int); |
| const char* p_type(int); |
| const char* p_rcode(int); |
| const u_char* p_cdnname(const u_char*, const u_char*, int, FILE*); |
| const u_char* p_cdname(const u_char*, const u_char*, FILE*); |
| const u_char* p_fqnname(const u_char*, const u_char*, int, char*, int); |
| const u_char* p_fqname(const u_char*, const u_char*, FILE*); |
| 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*); |
| const char* p_section(int, int); |
| /* Things involving a resolver context. */ |
| int res_ninit(res_state); |
| void res_pquery(const res_state, const u_char*, int, FILE*); |
| 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*); |
| void res_nclose(res_state); |
| int res_nopt(res_state, int, u_char*, int, int); |
| int res_vinit(res_state, 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*); |
| |
| u_int res_randomid(void); |
| |
| 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 herrnoToAiError(int herrno); |
| |
| // Helper function for converting rcode to the error codes visible to netd |
| int rcodeToAiError(int rcode); |
| |
| #endif // NETD_RESOLV_PRIVATE_H |