contrib/bind-9.2.4rc7/lib/bind/resolv/res_data.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1995-1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #if defined(LIBC_SCCS) && !defined(lint)
  19 static const char rcsid[] = "$Id: res_data.c,v 1.1.2.2 2004/03/16 12:35:33 marka Exp $";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 #include "port_before.h"
  23
  24 #include <sys/types.h>
  25 #include <sys/param.h>
  26 #include <sys/socket.h>
  27 #include <sys/time.h>
  28
  29 #include <netinet/in.h>
  30 #include <arpa/inet.h>
  31 #include <arpa/nameser.h>
  32
  33 #include <ctype.h>
  34 #include <netdb.h>
  35 #include <resolv.h>
  36 #include <res_update.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #include "port_after.h"
  43 #undef _res
  44
  45 const char *_res_opcodes[] = {
  46         "QUERY",
  47         "IQUERY",
  48         "CQUERYM",
  49         "CQUERYU",      /* experimental */
  50         "NOTIFY",       /* experimental */
  51         "UPDATE",
  52         "6",
  53         "7",
  54         "8",
  55         "9",
  56         "10",
  57         "11",
  58         "12",
  59         "13",
  60         "ZONEINIT",
  61         "ZONEREF",
  62 };
  63
  64 #ifdef BIND_UPDATE
  65 const char *_res_sectioncodes[] = {
  66         "ZONE",
  67         "PREREQUISITES",
  68         "UPDATE",
  69         "ADDITIONAL",
  70 };
  71 #endif
  72
  73 #ifndef __BIND_NOSTATIC
  74 struct __res_state _res
  75 # if defined(__BIND_RES_TEXT)
  76         = { RES_TIMEOUT, }      /* Motorola, et al. */
  77 # endif
  78         ;
  79
  80 /* Proto. */
  81
  82 int  res_ourserver_p(const res_state, const struct sockaddr_in *);
  83
  84 int
  85 res_init(void) {
  86         extern int __res_vinit(res_state, int);
  87
  88         /*
  89          * These three fields used to be statically initialized.  This made
  90          * it hard to use this code in a shared library.  It is necessary,
  91          * now that we're doing dynamic initialization here, that we preserve
  92          * the old semantics: if an application modifies one of these three
  93          * fields of _res before res_init() is called, res_init() will not
  94          * alter them.  Of course, if an application is setting them to
  95          * _zero_ before calling res_init(), hoping to override what used
  96          * to be the static default, we can't detect it and unexpected results
  97          * will follow.  Zero for any of these fields would make no sense,
  98          * so one can safely assume that the applications were already getting
  99          * unexpected results.
 100          *
 101          * _res.options is tricky since some apps were known to diddle the bits
 102          * before res_init() was first called. We can't replicate that semantic
 103          * with dynamic initialization (they may have turned bits off that are
 104          * set in RES_DEFAULT).  Our solution is to declare such applications
 105          * "broken".  They could fool us by setting RES_INIT but none do (yet).
 106          */
 107         if (!_res.retrans)
 108                 _res.retrans = RES_TIMEOUT;
 109         if (!_res.retry)
 110                 _res.retry = 4;
 111         if (!(_res.options & RES_INIT))
 112                 _res.options = RES_DEFAULT;
 113
 114         /*
 115          * This one used to initialize implicitly to zero, so unless the app
 116          * has set it to something in particular, we can randomize it now.
 117          */
 118         if (!_res.id)
 119                 _res.id = res_randomid();
 120
 121         return (__res_vinit(&_res, 1));
 122 }
 123
 124 void
 125 p_query(const u_char *msg) {
 126         fp_query(msg, stdout);
 127 }
 128
 129 void
 130 fp_query(const u_char *msg, FILE *file) {
 131         fp_nquery(msg, PACKETSZ, file);
 132 }
 133
 134 void
 135 fp_nquery(const u_char *msg, int len, FILE *file) {
 136         if ((_res.options & RES_INIT) == 0U && res_init() == -1)
 137                 return;
 138
 139         res_pquery(&_res, msg, len, file);
 140 }
 141
 142 int
 143 res_mkquery(int op,                     /* opcode of query */
 144             const char *dname,          /* domain name */
 145             int class, int type,        /* class and type of query */
 146             const u_char *data,         /* resource record data */
 147             int datalen,                /* length of data */
 148             const u_char *newrr_in,     /* new rr for modify or append */
 149             u_char *buf,                /* buffer to put query */
 150             int buflen)                 /* size of buffer */
 151 {
 152         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 153                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 154                 return (-1);
 155         }
 156         return (res_nmkquery(&_res, op, dname, class, type,
 157                              data, datalen,
 158                              newrr_in, buf, buflen));
 159 }
 160
 161 int
 162 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
 163         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 164                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 165                 return (-1);
 166         }
 167
 168         return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
 169 }
 170
 171 int
 172 res_query(const char *name,     /* domain name */
 173           int class, int type,  /* class and type of query */
 174           u_char *answer,       /* buffer to put answer */
 175           int anslen)           /* size of answer buffer */
 176 {
 177         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 178                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 179                 return (-1);
 180         }
 181         return (res_nquery(&_res, name, class, type, answer, anslen));
 182 }
 183
 184 void
 185 res_send_setqhook(res_send_qhook hook) {
 186         _res.qhook = hook;
 187 }
 188
 189 void
 190 res_send_setrhook(res_send_rhook hook) {
 191         _res.rhook = hook;
 192 }
 193
 194 int
 195 res_isourserver(const struct sockaddr_in *inp) {
 196         return (res_ourserver_p(&_res, inp));
 197 }
 198
 199 int
 200 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
 201         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 202                 /* errno should have been set by res_init() in this case. */
 203                 return (-1);
 204         }
 205
 206         return (res_nsend(&_res, buf, buflen, ans, anssiz));
 207 }
 208
 209 int
 210 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
 211                u_char *ans, int anssiz)
 212 {
 213         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 214                 /* errno should have been set by res_init() in this case. */
 215                 return (-1);
 216         }
 217
 218         return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
 219 }
 220
 221 void
 222 res_close(void) {
 223         res_nclose(&_res);
 224 }
 225
 226 int
 227 res_update(ns_updrec *rrecp_in) {
 228         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 229                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 230                 return (-1);
 231         }
 232
 233         return (res_nupdate(&_res, rrecp_in, NULL));
 234 }
 235
 236 int
 237 res_search(const char *name,    /* domain name */
 238            int class, int type, /* class and type of query */
 239            u_char *answer,      /* buffer to put answer */
 240            int anslen)          /* size of answer */
 241 {
 242         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 243                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 244                 return (-1);
 245         }
 246
 247         return (res_nsearch(&_res, name, class, type, answer, anslen));
 248 }
 249
 250 int
 251 res_querydomain(const char *name,
 252                 const char *domain,
 253                 int class, int type,    /* class and type of query */
 254                 u_char *answer,         /* buffer to put answer */
 255                 int anslen)             /* size of answer */
 256 {
 257         if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
 258                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 259                 return (-1);
 260         }
 261
 262         return (res_nquerydomain(&_res, name, domain,
 263                                  class, type,
 264                                  answer, anslen));
 265 }
 266
 267 const char *
 268 hostalias(const char *name) {
 269         static char abuf[MAXDNAME];
 270
 271         return (res_hostalias(&_res, name, abuf, sizeof abuf));
 272 }
 273
 274 #ifdef ultrix
 275 int
 276 local_hostname_length(const char *hostname) {
 277         int len_host, len_domain;
 278
 279         if (!*_res.defdname)
 280                 res_init();
 281         len_host = strlen(hostname);
 282         len_domain = strlen(_res.defdname);
 283         if (len_host > len_domain &&
 284             !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
 285             hostname[len_host - len_domain - 1] == '.')
 286                 return (len_host - len_domain - 1);
 287         return (0);
 288 }
 289 #endif /*ultrix*/
 290
 291 #endif