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:  * 4. Neither the name of the University nor the names of its contributors
   14:  *    may be used to endorse or promote products derived from this software
   15:  *    without specific prior written permission.
   16:  *
   17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27:  * SUCH DAMAGE.
   28:  */
   29: 
   30: /*
   31:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
   32:  *
   33:  * Permission to use, copy, modify, and distribute this software for any
   34:  * purpose with or without fee is hereby granted, provided that the above
   35:  * copyright notice and this permission notice appear in all copies.
   36:  *
   37:  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   38:  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
   39:  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
   40:  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
   41:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
   42:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
   43:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
   44:  * SOFTWARE.
   45:  */
   46: 
   47: /*
   48:  *      @(#)resolv.h 8.1 (Berkeley) 6/2/93
   49:  *      $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
   50:  */
   51: 
   52: #ifndef _RESOLV_H_
   53: 
   54: /* These headers are needed for types used in the `struct res_state'
   55:    declaration.  */
   56: #include <sys/types.h>
   57: #include <netinet/in.h>
   58: 
   59: #ifndef __need_res_state
   60: # define _RESOLV_H_
   61: 
   62: # include <sys/param.h>
   63: # include <sys/cdefs.h>
   64: # include <stdio.h>
   65: # include <arpa/nameser.h>
   66: #endif
   67: 
   68: #ifndef __res_state_defined
   69: # define __res_state_defined
   70: 
   71: typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
   72:         res_sendhookact;
   73: 
   74: typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,
   75:                                            const u_char **query,
   76:                                            int *querylen,
   77:                                            u_char *ans,
   78:                                            int anssiz,
   79:                                            int *resplen);
   80: 
   81: typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
   82:                                            const u_char *query,
   83:                                            int querylen,
   84:                                            u_char *ans,
   85:                                            int anssiz,
   86:                                            int *resplen);
   87: 
   88: /*
   89:  * Global defines and variables for resolver stub.
   90:  */
   91: # define MAXNS                  3      /* max # name servers we'll track */
   92: # define MAXDFLSRCH             3  /* # default domain levels to try */
   93: # define MAXDNSRCH              6   /* max # domains in search path */
   94: # define LOCALDOMAINPARTS       2     /* min levels in name that is "local" */
   95: 
   96: # define RES_TIMEOUT            5 /* min. seconds between retries */
   97: # define MAXRESOLVSORT          10      /* number of net to sort on */
   98: # define RES_MAXNDOTS           15       /* should reflect bit field size */
   99: # define RES_MAXRETRANS         30     /* only for resolv.conf/RES_OPTIONS */
  100: # define RES_MAXRETRY           5        /* only for resolv.conf/RES_OPTIONS */
  101: # define RES_DFLRETRY           2        /* Default #/tries. */
  102: # define RES_MAXTIME            65535     /* Infinity, in milliseconds. */
  103: 
  104: struct __res_state {
  105:         int    retrans;     /* retransmition time interval */
  106:         int    retry;                     /* number of times to retransmit */
  107:         u_long options;                /* option flags - see below. */
  108:         int    nscount;           /* number of name servers */
  109:         struct sockaddr_in
  110:                 nsaddr_list[MAXNS];   /* address of name server */
  111: # define nsaddr nsaddr_list[0]          /* for backward compatibility */
  112:         u_short        id;                    /* current message id */
  113:         /* 2 byte hole here.  */
  114:         char   *dnsrch[MAXDNSRCH+1];     /* components of domain to search */
  115:         char   defdname[256];            /* default domain (deprecated) */
  116:         u_long pfcode;                 /* RES_PRF_ flags - see below. */
  117:         unsigned ndots:4;              /* threshold for initial abs. query */
  118:         unsigned nsort:4;              /* number of elements in sort_list[] */
  119:         unsigned ipv6_unavail:1;       /* connecting to IPv6 server failed */
  120:         unsigned unused:23;
  121:         struct {
  122:                 struct in_addr        addr;
  123:                 u_int32_t     mask;
  124:         } sort_list[MAXRESOLVSORT];
  125:         /* 4 byte hole here on 64-bit architectures.  */
  126:         res_send_qhook qhook;          /* query hook */
  127:         res_send_rhook rhook;          /* response hook */
  128:         int    res_h_errno;               /* last one set for this context */
  129:         int    _vcsock;           /* PRIVATE: for res_send VC i/o */
  130:         u_int  _flags;                  /* PRIVATE: see below */
  131:         /* 4 byte hole here on 64-bit architectures.  */
  132:         union {
  133:                 char  pad[52]; /* On an i386 this means 512b total. */
  134:                 struct {
  135:                         u_int16_t            nscount;
  136:                         u_int16_t            nsmap[MAXNS];
  137:                         int                  nssocks[MAXNS];
  138:                         u_int16_t            nscount6;
  139:                         u_int16_t            nsinit;
  140:                         struct sockaddr_in6  *nsaddrs[MAXNS];
  141: #ifdef _LIBC
  142:                         unsigned long long int       initstamp
  143:                           __attribute__((packed));
  144: #else
  145:                         unsigned int         _initstamp[2];
  146: #endif
  147:                 } _ext;
  148:         } _u;
  149: };
  150: 
  151: typedef struct __res_state *res_state;
  152: # undef __need_res_state
  153: #endif
  154: 
  155: #ifdef _RESOLV_H_
  156: /*
  157:  * Revision information.  This is the release date in YYYYMMDD format.
  158:  * It can change every day so the right thing to do with it is use it
  159:  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
  160:  * compare for equality; rather, use it to determine whether your resolver
  161:  * is new enough to contain a certain feature.
  162:  */
  163: 
  164: #define __RES   19991006
  165: 
  166: /*
  167:  * Resolver configuration file.
  168:  * Normally not present, but may contain the address of the
  169:  * inital name server(s) to query and the domain search list.
  170:  */
  171: 
  172: #ifndef _PATH_RESCONF
  173: #define _PATH_RESCONF        "/etc/resolv.conf"
  174: #endif
  175: 
  176: struct res_sym {
  177:         int    number;            /* Identifying number, like T_MX */
  178:         char * name;           /* Its symbolic name, like "MX" */
  179:         char * humanname;      /* Its fun name, like "mail exchanger" */
  180: };
  181: 
  182: /*
  183:  * Resolver flags (used to be discrete per-module statics ints).
  184:  */
  185: #define RES_F_VC        0x00000001     /* socket is TCP */
  186: #define RES_F_CONN      0x00000002   /* socket is connected */
  187: #define RES_F_EDNS0ERR  0x00000004       /* EDNS0 caused errors */
  188: 
  189: /* res_findzonecut() options */
  190: #define RES_EXHAUSTIVE  0x00000001       /* always do all queries */
  191: 
  192: /*
  193:  * Resolver options (keep these in synch with res_debug.c, please)
  194:  */
  195: #define RES_INIT        0x00000001     /* address initialized */
  196: #define RES_DEBUG       0x00000002    /* print debug messages */
  197: #define RES_AAONLY      0x00000004   /* authoritative answers only (!IMPL)*/
  198: #define RES_USEVC       0x00000008    /* use virtual circuit */
  199: #define RES_PRIMARY     0x00000010  /* query primary server only (!IMPL) */
  200: #define RES_IGNTC       0x00000020    /* ignore trucation errors */
  201: #define RES_RECURSE     0x00000040  /* recursion desired */
  202: #define RES_DEFNAMES    0x00000080 /* use default domain name */
  203: #define RES_STAYOPEN    0x00000100 /* Keep TCP socket open */
  204: #define RES_DNSRCH      0x00000200   /* search up local domain tree */
  205: #define RES_INSECURE1   0x00000400        /* type 1 security disabled */
  206: #define RES_INSECURE2   0x00000800        /* type 2 security disabled */
  207: #define RES_NOALIASES   0x00001000        /* shuts off HOSTALIASES feature */
  208: #define RES_USE_INET6   0x00002000        /* use/map IPv6 in gethostbyname() */
  209: #define RES_ROTATE      0x00004000   /* rotate ns list after each query */
  210: #define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
  211: #define RES_KEEPTSIG    0x00010000 /* do not strip TSIG records */
  212: #define RES_BLAST       0x00020000    /* blast all recursive servers */
  213: #define RES_USEBSTRING  0x00040000       /* IPv6 reverse lookup with byte
  214:                                            strings */
  215: #define RES_NOIP6DOTINT 0x00080000      /* Do not use .ip6.int in IPv6
  216:                                            reverse lookup */
  217: #define RES_USE_EDNS0   0x00100000        /* Use EDNS0.  */
  218: 
  219: #define RES_DEFAULT     (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
  220: 
  221: /*
  222:  * Resolver "pfcode" values.  Used by dig.
  223:  */
  224: #define RES_PRF_STATS   0x00000001
  225: #define RES_PRF_UPDATE  0x00000002
  226: #define RES_PRF_CLASS   0x00000004
  227: #define RES_PRF_CMD     0x00000008
  228: #define RES_PRF_QUES    0x00000010
  229: #define RES_PRF_ANS     0x00000020
  230: #define RES_PRF_AUTH    0x00000040
  231: #define RES_PRF_ADD     0x00000080
  232: #define RES_PRF_HEAD1   0x00000100
  233: #define RES_PRF_HEAD2   0x00000200
  234: #define RES_PRF_TTLID   0x00000400
  235: #define RES_PRF_HEADX   0x00000800
  236: #define RES_PRF_QUERY   0x00001000
  237: #define RES_PRF_REPLY   0x00002000
  238: #define RES_PRF_INIT    0x00004000
  239: /*                      0x00008000 */
  240: 
  241: /* Things involving an internal (static) resolver context. */
  242: __BEGIN_DECLS
  243: extern struct __res_state *__res_state(void) __attribute__ ((__const__));
  244: __END_DECLS
  245: #define _res (*__res_state())
  246: 
  247: #ifndef __BIND_NOSTATIC
  248: #define fp_nquery               __fp_nquery
  249: #define fp_query                __fp_query
  250: #define hostalias               __hostalias
  251: #define p_query                 __p_query
  252: #define res_close               __res_close
  253: #define res_init                __res_init
  254: #define res_isourserver         __res_isourserver
  255: #define res_mkquery             __res_mkquery
  256: #define res_query               __res_query
  257: #define res_querydomain         __res_querydomain
  258: #define res_search              __res_search
  259: #define res_send                __res_send
  260: 
  261: __BEGIN_DECLS
  262: void            fp_nquery (const u_char *, int, FILE *) __THROW;
  263: void            fp_query (const u_char *, FILE *) __THROW;
  264: const char *    hostalias (const char *) __THROW;
  265: void            p_query (const u_char *) __THROW;
  266: void            res_close (void) __THROW;
  267: int             res_init (void) __THROW;
  268: int             res_isourserver (const struct sockaddr_in *) __THROW;
  269: int             res_mkquery (int, const char *, int, int, const u_char *,
  270:                              int, const u_char *, u_char *, int) __THROW;
  271: int             res_query (const char *, int, int, u_char *, int) __THROW;
  272: int             res_querydomain (const char *, const char *, int, int,
  273:                                  u_char *, int) __THROW;
  274: int             res_search (const char *, int, int, u_char *, int) __THROW;
  275: int             res_send (const u_char *, int, u_char *, int) __THROW;
  276: __END_DECLS
  277: #endif
  278: 
  279: #define b64_ntop                __b64_ntop
  280: #define b64_pton                __b64_pton
  281: #define dn_comp                 __dn_comp
  282: #define dn_count_labels         __dn_count_labels
  283: #define dn_expand               __dn_expand
  284: #define dn_skipname             __dn_skipname
  285: #define fp_resstat              __fp_resstat
  286: #define loc_aton                __loc_aton
  287: #define loc_ntoa                __loc_ntoa
  288: #define p_cdname                __p_cdname
  289: #define p_cdnname               __p_cdnname
  290: #define p_class                 __p_class
  291: #define p_fqname                __p_fqname
  292: #define p_fqnname               __p_fqnname
  293: #define p_option                __p_option
  294: #define p_secstodate            __p_secstodate
  295: #define p_section               __p_section
  296: #define p_time                  __p_time
  297: #define p_type                  __p_type
  298: #define p_rcode                 __p_rcode
  299: #define putlong                 __putlong
  300: #define putshort                __putshort
  301: #define res_dnok                __res_dnok
  302: #define res_hnok                __res_hnok
  303: #define res_hostalias           __res_hostalias
  304: #define res_mailok              __res_mailok
  305: #define res_nameinquery         __res_nameinquery
  306: #define res_nclose              __res_nclose
  307: #define res_ninit               __res_ninit
  308: #define res_nmkquery            __res_nmkquery
  309: #define res_npquery             __res_npquery
  310: #define res_nquery              __res_nquery
  311: #define res_nquerydomain        __res_nquerydomain
  312: #define res_nsearch             __res_nsearch
  313: #define res_nsend               __res_nsend
  314: #define res_nisourserver        __res_nisourserver
  315: #define res_ownok               __res_ownok
  316: #define res_queriesmatch        __res_queriesmatch
  317: #define res_randomid            __res_randomid
  318: #define sym_ntop                __sym_ntop
  319: #define sym_ntos                __sym_ntos
  320: #define sym_ston                __sym_ston
  321: __BEGIN_DECLS
  322: int             res_hnok (const char *) __THROW;
  323: int             res_ownok (const char *) __THROW;
  324: int             res_mailok (const char *) __THROW;
  325: int             res_dnok (const char *) __THROW;
  326: int             sym_ston (const struct res_sym *, const char *, int *) __THROW;
  327: const char *    sym_ntos (const struct res_sym *, int, int *) __THROW;
  328: const char *    sym_ntop (const struct res_sym *, int, int *) __THROW;
  329: int             b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
  330: int             b64_pton (char const *, u_char *, size_t) __THROW;
  331: int             loc_aton (const char *ascii, u_char *binary) __THROW;
  332: const char *    loc_ntoa (const u_char *binary, char *ascii) __THROW;
  333: int             dn_skipname (const u_char *, const u_char *) __THROW;
  334: void            putlong (u_int32_t, u_char *) __THROW;
  335: void            putshort (u_int16_t, u_char *) __THROW;
  336: const char *    p_class (int) __THROW;
  337: const char *    p_time (u_int32_t) __THROW;
  338: const char *    p_type (int) __THROW;
  339: const char *    p_rcode (int) __THROW;
  340: const u_char *  p_cdnname (const u_char *, const u_char *, int, FILE *)
  341:      __THROW;
  342: const u_char *  p_cdname (const u_char *, const u_char *, FILE *) __THROW;
  343: const u_char *  p_fqnname (const u_char *cp, const u_char *msg,
  344:                            int, char *, int) __THROW;
  345: const u_char *  p_fqname (const u_char *, const u_char *, FILE *) __THROW;
  346: const char *    p_option (u_long option) __THROW;
  347: char *          p_secstodate (u_long) __THROW;
  348: int             dn_count_labels (const char *) __THROW;
  349: int             dn_comp (const char *, u_char *, int, u_char **, u_char **)
  350:      __THROW;
  351: int             dn_expand (const u_char *, const u_char *, const u_char *,
  352:                            char *, int) __THROW;
  353: u_int           res_randomid (void) __THROW;
  354: int             res_nameinquery (const char *, int, int,
  355:                                  const u_char *, const u_char *) __THROW;
  356: int             res_queriesmatch (const u_char *, const u_char *,
  357:                                   const u_char *, const u_char *) __THROW;
  358: const char *    p_section (int section, int opcode) __THROW;
  359: /* Things involving a resolver context. */
  360: int             res_ninit (res_state) __THROW;
  361: int             res_nisourserver (const res_state,
  362:                                   const struct sockaddr_in *) __THROW;
  363: void            fp_resstat (const res_state, FILE *) __THROW;
  364: void            res_npquery (const res_state, const u_char *, int, FILE *)
  365:      __THROW;
  366: const char *    res_hostalias (const res_state, const char *, char *, size_t)
  367:      __THROW;
  368: int             res_nquery (res_state, const char *, int, int, u_char *, int)
  369:      __THROW;
  370: int             res_nsearch (res_state, const char *, int, int, u_char *, int)
  371:      __THROW;
  372: int             res_nquerydomain (res_state, const char *, const char *, int,
  373:                                   int, u_char *, int) __THROW;
  374: int             res_nmkquery (res_state, int, const char *, int, int,
  375:                               const u_char *, int, const u_char *, u_char *,
  376:                               int) __THROW;
  377: int             res_nsend (res_state, const u_char *, int, u_char *, int)
  378:      __THROW;
  379: void            res_nclose (res_state) __THROW;
  380: __END_DECLS
  381: #endif
  382: 
  383: #endif /* !_RESOLV_H_ */