Annotation of embedaddon/dhcp/includes/minires/resolv.h, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (c) 1983, 1987, 1989
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. All advertising materials mentioning features or use of this software
! 14: * must display the following acknowledgement:
! 15: * This product includes software developed by the University of
! 16: * California, Berkeley and its contributors.
! 17: * 4. Neither the name of the University nor the names of its contributors
! 18: * may be used to endorse or promote products derived from this software
! 19: * without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 31: * SUCH DAMAGE.
! 32: */
! 33:
! 34: /*
! 35: * Portions Copyright (c) 2004,2007-2009 by Internet Systems Consortium,
! 36: * Inc. ("ISC")
! 37: * Portions Copyright (c) 1995-2003 by Internet Software Consortium
! 38: *
! 39: * Permission to use, copy, modify, and distribute this software for any
! 40: * purpose with or without fee is hereby granted, provided that the above
! 41: * copyright notice and this permission notice appear in all copies.
! 42: *
! 43: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
! 44: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 45: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
! 46: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 47: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 48: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
! 49: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 50: *
! 51: * Internet Systems Consortium, Inc.
! 52: * 950 Charter Street
! 53: * Redwood City, CA 94063
! 54: * <info@isc.org>
! 55: * https://www.isc.org/
! 56: */
! 57:
! 58: /*
! 59: * @(#)resolv.h 8.1 (Berkeley) 6/2/93
! 60: * $Id: resolv.h,v 1.6.116.2 2009-07-24 22:04:52 sar Exp $
! 61: */
! 62:
! 63: #ifndef _RESOLV_H_
! 64: #define _RESOLV_H_
! 65:
! 66: #include <sys/types.h>
! 67:
! 68: /*
! 69: * This used to be defined in res_query.c, now it's in herror.c.
! 70: * [XXX no it's not. It's in irs/irs_data.c]
! 71: * It was
! 72: * never extern'd by any *.h file before it was placed here. For thread
! 73: * aware programs, the last h_errno value set is stored in res->h_errno.
! 74: *
! 75: * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
! 76: * (and __h_errno_set) to the public via <resolv.h>.
! 77: * XXX: __h_errno_set is really part of IRS, not part of the resolver.
! 78: * If somebody wants to build and use a resolver that doesn't use IRS,
! 79: * what do they do? Perhaps something like
! 80: * #ifdef WANT_IRS
! 81: * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
! 82: * #else
! 83: * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
! 84: * #endif
! 85: */
! 86:
! 87: #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
! 88: struct __res_state; /* forward */
! 89: void __h_errno_set(struct __res_state *res, int err);
! 90:
! 91: /*
! 92: * Resolver configuration file.
! 93: * Normally not present, but may contain the address of the
! 94: * inital name server(s) to query and the domain search list.
! 95: */
! 96:
! 97: #ifndef _PATH_RESCONF
! 98: #define _PATH_RESCONF "/etc/resolv.conf"
! 99: #endif
! 100:
! 101: typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
! 102: res_sendhookact;
! 103:
! 104: typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,
! 105: double **query,
! 106: unsigned *querylen,
! 107: double *ans,
! 108: unsigned anssiz,
! 109: int *resplen);
! 110:
! 111: typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
! 112: double *query,
! 113: unsigned querylen,
! 114: double *ans,
! 115: unsigned anssiz,
! 116: int *resplen);
! 117:
! 118: struct res_sym {
! 119: int number; /* Identifying number, like T_MX */
! 120: char * name; /* Its symbolic name, like "MX" */
! 121: char * humanname; /* Its fun name, like "mail exchanger" */
! 122: };
! 123:
! 124: /*
! 125: * Global defines and variables for resolver stub.
! 126: */
! 127: #define MAXNS 3 /* max # name servers we'll track */
! 128: #define MAXDFLSRCH 3 /* # default domain levels to try */
! 129: #define MAXDNSRCH 6 /* max # domains in search path */
! 130: #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
! 131:
! 132: #define RES_TIMEOUT 5 /* min. seconds between retries */
! 133: #define MAXRESOLVSORT 10 /* number of net to sort on */
! 134: #define RES_MAXNDOTS 15 /* should reflect bit field size */
! 135: #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
! 136: #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
! 137: #define RES_DFLRETRY 2 /* Default #/tries. */
! 138:
! 139: struct __res_state {
! 140: int retrans; /* retransmition time interval */
! 141: int retry; /* number of times to retransmit */
! 142: u_long options; /* option flags - see below. */
! 143: int nscount; /* number of name servers */
! 144: struct sockaddr_in
! 145: nsaddr_list[MAXNS]; /* address of name server */
! 146: #define nsaddr nsaddr_list[0] /* for backward compatibility */
! 147: u_short id; /* current message id */
! 148: char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
! 149: char defdname[256]; /* default domain (deprecated) */
! 150: u_long pfcode; /* RES_PRF_ flags - see below. */
! 151: unsigned ndots:4; /* threshold for initial abs. query */
! 152: unsigned nsort:4; /* number of elements in sort_list[] */
! 153: char unused[3];
! 154: struct {
! 155: struct in_addr addr;
! 156: u_int32_t mask;
! 157: } sort_list[MAXRESOLVSORT];
! 158: res_send_qhook qhook; /* query hook */
! 159: res_send_rhook rhook; /* response hook */
! 160: int res_h_errno; /* last one set for this context */
! 161: int _sock; /* PRIVATE: for res_send i/o */
! 162: u_int _flags; /* PRIVATE: see below */
! 163: char pad[52]; /* On an i386 this means 512b total. */
! 164: };
! 165:
! 166: typedef struct __res_state *res_state;
! 167:
! 168: /*
! 169: * Resolver flags (used to be discrete per-module statics ints).
! 170: */
! 171: #define RES_F_VC 0x00000001 /* socket is TCP */
! 172: #define RES_F_CONN 0x00000002 /* socket is connected */
! 173:
! 174: /* res_findzonecut() options */
! 175: #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
! 176:
! 177: /*
! 178: * Resolver options (keep these in synch with res_debug.c, please)
! 179: */
! 180: #define RES_INIT 0x00000001 /* address initialized */
! 181: #define RES_DEBUG 0x00000002 /* print debug messages */
! 182: #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
! 183: #define RES_USEVC 0x00000008 /* use virtual circuit */
! 184: #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
! 185: #define RES_IGNTC 0x00000020 /* ignore trucation errors */
! 186: #define RES_RECURSE 0x00000040 /* recursion desired */
! 187: #define RES_DEFNAMES 0x00000080 /* use default domain name */
! 188: #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
! 189: #define RES_DNSRCH 0x00000200 /* search up local domain tree */
! 190: #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
! 191: #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
! 192: #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
! 193: #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
! 194: #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
! 195: #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
! 196: #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
! 197:
! 198: #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
! 199:
! 200: /*
! 201: * Resolver "pfcode" values. Used by dig.
! 202: */
! 203: #define RES_PRF_STATS 0x00000001
! 204: #define RES_PRF_UPDATE 0x00000002
! 205: #define RES_PRF_CLASS 0x00000004
! 206: #define RES_PRF_CMD 0x00000008
! 207: #define RES_PRF_QUES 0x00000010
! 208: #define RES_PRF_ANS 0x00000020
! 209: #define RES_PRF_AUTH 0x00000040
! 210: #define RES_PRF_ADD 0x00000080
! 211: #define RES_PRF_HEAD1 0x00000100
! 212: #define RES_PRF_HEAD2 0x00000200
! 213: #define RES_PRF_TTLID 0x00000400
! 214: #define RES_PRF_HEADX 0x00000800
! 215: #define RES_PRF_QUERY 0x00001000
! 216: #define RES_PRF_REPLY 0x00002000
! 217: #define RES_PRF_INIT 0x00004000
! 218: /* 0x00008000 */
! 219:
! 220: #if 0
! 221: /* Things involving an internal (static) resolver context. */
! 222: #ifdef _REENTRANT
! 223: extern struct __res_state *__res_state(void);
! 224: #define _res (*__res_state())
! 225: #else
! 226: #ifndef __BIND_NOSTATIC
! 227: extern struct __res_state _res;
! 228: #endif
! 229: #endif
! 230:
! 231: void fp_nquery (const u_char *, int, FILE *);
! 232: void fp_query (const u_char *, FILE *);
! 233: const char * hostalias (const char *);
! 234: void p_query (const u_char *);
! 235: void res_close (void);
! 236: int res_init (void);
! 237: int res_isourserver (const struct sockaddr_in *);
! 238: int res_mkquery (int, const char *, int, int, const u_char *,
! 239: int, const u_char *, u_char *, int);
! 240: int res_query (const char *, int, int, u_char *, int);
! 241: int res_querydomain (const char *, const char *, int, int,
! 242: u_char *, int);
! 243: int res_search (const char *, int, int, u_char *, int);
! 244: int res_send (const u_char *, int, u_char *, int);
! 245: int res_sendsigned (const u_char *, int, ns_tsig_key *,
! 246: u_char *, int);
! 247:
! 248: #if !defined(SHARED_LIBBIND) || defined(LIB)
! 249: /*
! 250: * If libbind is a shared object (well, DLL anyway)
! 251: * these externs break the linker when resolv.h is
! 252: * included by a lib client (like named)
! 253: * Make them go away if a client is including this
! 254: *
! 255: */
! 256: extern const struct res_sym __p_key_syms[];
! 257: extern const struct res_sym __p_cert_syms[];
! 258: extern const struct res_sym __p_class_syms[];
! 259: extern const struct res_sym __p_type_syms[];
! 260: extern const struct res_sym __p_rcode_syms[];
! 261: #endif /* SHARED_LIBBIND */
! 262:
! 263: int res_hnok (const char *);
! 264: int res_ownok (const char *);
! 265: int res_mailok (const char *);
! 266: int res_dnok (const char *);
! 267: int sym_ston (const struct res_sym *, const char *, int *);
! 268: const char * sym_ntos (const struct res_sym *, int, int *);
! 269: const char * sym_ntop (const struct res_sym *, int, int *);
! 270: int b64_ntop (u_char const *, size_t, char *, size_t);
! 271: int b64_pton (char const *, u_char *, size_t);
! 272: int loc_aton (const char *ascii, u_char *binary);
! 273: const char * loc_ntoa (const u_char *binary, char *ascii);
! 274: int dn_skipname (const u_char *, const u_char *);
! 275: void putlong (u_int32_t, u_char *);
! 276: void putshort (u_int16_t, u_char *);
! 277: const char * p_class (int);
! 278: const char * p_time (u_int32_t);
! 279: const char * p_type (int);
! 280: const char * p_rcode (int);
! 281: const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *);
! 282: const u_char * p_cdname (const u_char *, const u_char *, FILE *);
! 283: const u_char * p_fqnname (const u_char *cp, const u_char *msg,
! 284: int, char *, int);
! 285: const u_char * p_fqname (const u_char *, const u_char *, FILE *);
! 286: const char * p_option (u_long option);
! 287: char * p_secstodate (u_long);
! 288: int dn_count_labels (const char *);
! 289: int dn_expand (const u_char *, const u_char *, const u_char *,
! 290: char *, int);
! 291: u_int res_randomid (void);
! 292: int res_nameinquery (const char *, int, int,
! 293: const u_char *, const u_char *);
! 294: int res_queriesmatch (const u_char *, const u_char *,
! 295: const u_char *, const u_char *);
! 296: const char * p_section (int section, int opcode);
! 297: /* Things involving a resolver context. */
! 298: int res_ninit (res_state);
! 299: int res_nisourserver (const res_state,
! 300: const struct sockaddr_in *);
! 301: void fp_resstat (const res_state, FILE *);
! 302: void res_npquery (const res_state, const u_char *, int, FILE *);
! 303: const char * res_hostalias (const res_state, const char *,
! 304: char *, size_t);
! 305: int res_nquery (res_state,
! 306: const char *, int, int, u_char *, int);
! 307: int res_nsearch (res_state, const char *, int,
! 308: int, u_char *, int);
! 309: int res_nquerydomain (res_state,
! 310: const char *, const char *, int, int,
! 311: u_char *, int);
! 312: int res_nmkquery (res_state,
! 313: int, const char *, int, int, const u_char *,
! 314: int, const u_char *, u_char *, int);
! 315: int res_nsend (res_state, const u_char *, int, u_char *, int);
! 316: int res_nsendsigned (res_state, const u_char *, int,
! 317: ns_tsig_key *, u_char *, int);
! 318: int res_findzonecut (res_state, const char *, ns_class, int,
! 319: char *, size_t, struct in_addr *, int);
! 320: void res_nclose (res_state);
! 321:
! 322: #endif /* 0 */
! 323: #endif /* !_RESOLV_H_ */
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