resolv/res_data.c

   1 /*
   2  * Copyright (c) 1995-1999 by Internet Software Consortium.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   9  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  10  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  11  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  12  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  13  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  14  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  15  * SOFTWARE.
  16  */
  17
  18 #include <sys/types.h>
  19 #include <sys/param.h>
  20 #include <sys/socket.h>
  21 #include <sys/time.h>
  22
  23 #include <netinet/in.h>
  24 #include <arpa/inet.h>
  25 #include <arpa/nameser.h>
  26
  27 #include <ctype.h>
  28 #include <netdb.h>
  29 #include <resolv.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34
  35 const char *_res_opcodes[] = {
  36         "QUERY",
  37         "IQUERY",
  38         "CQUERYM",
  39         "CQUERYU",      /* experimental */
  40         "NOTIFY",       /* experimental */
  41         "UPDATE",
  42         "6",
  43         "7",
  44         "8",
  45         "9",
  46         "10",
  47         "11",
  48         "12",
  49         "13",
  50         "ZONEINIT",
  51         "ZONEREF",
  52 };
  53 libresolv_hidden_data_def (_res_opcodes)
  54
  55 #ifndef __BIND_NOSTATIC
  56 void
  57 p_query(const u_char *msg) {
  58         fp_query(msg, stdout);
  59 }
  60
  61 void
  62 fp_query(const u_char *msg, FILE *file) {
  63         fp_nquery(msg, PACKETSZ, file);
  64 }
  65 libresolv_hidden_def (fp_query)
  66
  67 void
  68 fp_nquery(const u_char *msg, int len, FILE *file) {
  69         if (__res_maybe_init (&_res, 0) == -1)
  70                 return;
  71
  72         res_pquery(&_res, msg, len, file);
  73 }
  74 libresolv_hidden_def (fp_nquery)
  75
  76 int
  77 res_mkquery(int op,                     /* opcode of query */
  78             const char *dname,          /* domain name */
  79             int class, int type,        /* class and type of query */
  80             const u_char *data,         /* resource record data */
  81             int datalen,                /* length of data */
  82             const u_char *newrr_in,     /* new rr for modify or append */
  83             u_char *buf,                /* buffer to put query */
  84             int buflen)                 /* size of buffer */
  85 {
  86         if (__res_maybe_init (&_res, 1) == -1) {
  87                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
  88                 return (-1);
  89         }
  90         return (res_nmkquery(&_res, op, dname, class, type,
  91                              data, datalen,
  92                              newrr_in, buf, buflen));
  93 }
  94
  95 int
  96 res_query(const char *name,     /* domain name */
  97           int class, int type,  /* class and type of query */
  98           u_char *answer,       /* buffer to put answer */
  99           int anslen)           /* size of answer buffer */
 100 {
 101         if (__res_maybe_init (&_res, 1) == -1) {
 102                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 103                 return (-1);
 104         }
 105         return (res_nquery(&_res, name, class, type, answer, anslen));
 106 }
 107
 108 void
 109 res_send_setqhook(res_send_qhook hook) {
 110         _res.qhook = hook;
 111 }
 112
 113 void
 114 res_send_setrhook(res_send_rhook hook) {
 115         _res.rhook = hook;
 116 }
 117
 118 int
 119 res_isourserver(const struct sockaddr_in *inp) {
 120         return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp));
 121 }
 122
 123 int
 124 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
 125         if (__res_maybe_init (&_res, 1) == -1) {
 126                 /* errno should have been set by res_init() in this case. */
 127                 return (-1);
 128         }
 129
 130         return (res_nsend(&_res, buf, buflen, ans, anssiz));
 131 }
 132
 133
 134 void
 135 res_close(void) {
 136         /*
 137          * Some stupid programs out there call res_close() before res_init().
 138          * Since _res._vcsock isn't explicitly initialized, these means that
 139          * we could do a close(0), which might lead to some security problems.
 140          * Therefore we check if res_init() was called before by looking at
 141          * the RES_INIT bit in _res.options.  If it hasn't been set we bail out
 142          * early.  */
 143         if ((_res.options & RES_INIT) == 0)
 144           return;
 145         /* We don't free the name server addresses because we never
 146            did it and it would be done implicitly on shutdown.  */
 147         __res_iclose(&_res, false);
 148 }
 149
 150 int
 151 res_search(const char *name,    /* domain name */
 152            int class, int type, /* class and type of query */
 153            u_char *answer,      /* buffer to put answer */
 154            int anslen)          /* size of answer */
 155 {
 156         if (__res_maybe_init (&_res, 1) == -1) {
 157                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 158                 return (-1);
 159         }
 160
 161         return (res_nsearch(&_res, name, class, type, answer, anslen));
 162 }
 163
 164 int
 165 res_querydomain(const char *name,
 166                 const char *domain,
 167                 int class, int type,    /* class and type of query */
 168                 u_char *answer,         /* buffer to put answer */
 169                 int anslen)             /* size of answer */
 170 {
 171         if (__res_maybe_init (&_res, 1) == -1) {
 172                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 173                 return (-1);
 174         }
 175
 176         return (res_nquerydomain(&_res, name, domain,
 177                                  class, type,
 178                                  answer, anslen));
 179 }
 180
 181 const char *
 182 hostalias(const char *name) {
 183         static char abuf[MAXDNAME];
 184
 185         return (res_hostalias(&_res, name, abuf, sizeof abuf));
 186 }
 187 libresolv_hidden_def (hostalias)
 188
 189 #endif
 190 \f
 191
 192 #include <shlib-compat.h>
 193
 194 #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
 195 # undef res_mkquery
 196 # undef res_query
 197 # undef res_querydomain
 198 # undef res_search
 199 weak_alias (__res_mkquery, res_mkquery);
 200 weak_alias (__res_query, res_query);
 201 weak_alias (__res_querydomain, res_querydomain);
 202 weak_alias (__res_search, res_search);
 203 #endif