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 void
  56 p_query(const u_char *msg) {
  57         fp_query(msg, stdout);
  58 }
  59
  60 void
  61 fp_query(const u_char *msg, FILE *file) {
  62         fp_nquery(msg, PACKETSZ, file);
  63 }
  64 libresolv_hidden_def (fp_query)
  65
  66 void
  67 fp_nquery(const u_char *msg, int len, FILE *file) {
  68         if (__res_maybe_init (&_res, 0) == -1)
  69                 return;
  70
  71         res_pquery(&_res, msg, len, file);
  72 }
  73 libresolv_hidden_def (fp_nquery)
  74
  75 int
  76 res_mkquery(int op,                     /* opcode of query */
  77             const char *dname,          /* domain name */
  78             int class, int type,        /* class and type of query */
  79             const u_char *data,         /* resource record data */
  80             int datalen,                /* length of data */
  81             const u_char *newrr_in,     /* new rr for modify or append */
  82             u_char *buf,                /* buffer to put query */
  83             int buflen)                 /* size of buffer */
  84 {
  85         if (__res_maybe_init (&_res, 1) == -1) {
  86                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
  87                 return (-1);
  88         }
  89         return (res_nmkquery(&_res, op, dname, class, type,
  90                              data, datalen,
  91                              newrr_in, buf, buflen));
  92 }
  93
  94 int
  95 res_query(const char *name,     /* domain name */
  96           int class, int type,  /* class and type of query */
  97           u_char *answer,       /* buffer to put answer */
  98           int anslen)           /* size of answer buffer */
  99 {
 100         if (__res_maybe_init (&_res, 1) == -1) {
 101                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 102                 return (-1);
 103         }
 104         return (res_nquery(&_res, name, class, type, answer, anslen));
 105 }
 106
 107 int
 108 res_isourserver(const struct sockaddr_in *inp) {
 109         return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp));
 110 }
 111
 112 int
 113 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
 114         if (__res_maybe_init (&_res, 1) == -1) {
 115                 /* errno should have been set by res_init() in this case. */
 116                 return (-1);
 117         }
 118
 119         return (res_nsend(&_res, buf, buflen, ans, anssiz));
 120 }
 121
 122
 123 void
 124 res_close(void) {
 125         /*
 126          * Some stupid programs out there call res_close() before res_init().
 127          * Since _res._vcsock isn't explicitly initialized, these means that
 128          * we could do a close(0), which might lead to some security problems.
 129          * Therefore we check if res_init() was called before by looking at
 130          * the RES_INIT bit in _res.options.  If it hasn't been set we bail out
 131          * early.  */
 132         if ((_res.options & RES_INIT) == 0)
 133           return;
 134         /* We don't free the name server addresses because we never
 135            did it and it would be done implicitly on shutdown.  */
 136         __res_iclose(&_res, false);
 137 }
 138
 139 int
 140 res_search(const char *name,    /* domain name */
 141            int class, int type, /* class and type of query */
 142            u_char *answer,      /* buffer to put answer */
 143            int anslen)          /* size of answer */
 144 {
 145         if (__res_maybe_init (&_res, 1) == -1) {
 146                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 147                 return (-1);
 148         }
 149
 150         return (res_nsearch(&_res, name, class, type, answer, anslen));
 151 }
 152
 153 int
 154 res_querydomain(const char *name,
 155                 const char *domain,
 156                 int class, int type,    /* class and type of query */
 157                 u_char *answer,         /* buffer to put answer */
 158                 int anslen)             /* size of answer */
 159 {
 160         if (__res_maybe_init (&_res, 1) == -1) {
 161                 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
 162                 return (-1);
 163         }
 164
 165         return (res_nquerydomain(&_res, name, domain,
 166                                  class, type,
 167                                  answer, anslen));
 168 }
 169
 170 const char *
 171 hostalias(const char *name) {
 172         static char abuf[MAXDNAME];
 173
 174         return (res_hostalias(&_res, name, abuf, sizeof abuf));
 175 }
 176 libresolv_hidden_def (hostalias)
 177
 178 \f
 179
 180 #include <shlib-compat.h>
 181
 182 #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
 183 # undef res_mkquery
 184 # undef res_query
 185 # undef res_querydomain
 186 # undef res_search
 187 weak_alias (__res_mkquery, res_mkquery);
 188 weak_alias (__res_query, res_query);
 189 weak_alias (__res_querydomain, res_querydomain);
 190 weak_alias (__res_search, res_search);
 191 #endif