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glibc  2.9
Functions | Variables
res_data.c File Reference
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <shlib-compat.h>

Go to the source code of this file.

Functions

 libresolv_hidden_data_def (_res_opcodes)
void p_query (const u_char *msg)
void fp_query (const u_char *msg, FILE *file)
 libresolv_hidden_def (fp_query)
 libresolv_hidden_def (fp_nquery)
int res_query (const char *name, int class, int type, u_char *answer, int anslen)
void res_send_setqhook (res_send_qhook hook)
void res_send_setrhook (res_send_rhook hook)
int res_isourserver (const struct sockaddr_in *inp)
int res_send (const u_char *buf, int buflen, u_char *ans, int anssiz)
int res_sendsigned (const u_char *buf, int buflen, ns_tsig_key *key, u_char *ans, int anssiz)
void res_close (void)
int res_search (const char *name, int class, int type, u_char *answer, int anslen)
int res_querydomain (const char *name, const char *domain, int class, int type, u_char *answer, int anslen)
const char * hostalias (const char *name)

Variables

const char * _res_opcodes []

Function Documentation

void fp_query ( const u_char msg,
FILE file 
)

Definition at line 139 of file res_data.c.

                                        {
       fp_nquery(msg, PACKETSZ, file);
}

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const char* hostalias ( const char *  name)

Definition at line 298 of file res_data.c.

                            {
       static char abuf[MAXDNAME];

       return (res_hostalias(&_res, name, abuf, sizeof abuf));
}

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Definition at line 60 of file res_data.c.

                                                   {
       "ZONE",
       "PREREQUISITES",
       "UPDATE",
       "ADDITIONAL",
};
#endif

#ifndef __BIND_NOSTATIC
#ifdef _LIBC
/* The definition has been moved to res_libc.c.  */
#else
#undef _res
struct __res_state _res
# if defined(__BIND_RES_TEXT)
       = { RES_TIMEOUT, }   /* Motorola, et al. */
# endif
        ;
#endif

/* Proto. */
#ifndef _LIBC
int  res_ourserver_p(const res_state, const struct sockaddr_in *);
void res_pquery(const res_state, const u_char *, int, FILE *);
#endif

#ifndef _LIBC
/* Moved to res_libc.c since res_init() should go into libc.so but the
   rest of this file not.  */
int
res_init(void) {
       extern int __res_vinit(res_state, int);

       /*
        * These three fields used to be statically initialized.  This made
        * it hard to use this code in a shared library.  It is necessary,
        * now that we're doing dynamic initialization here, that we preserve
        * the old semantics: if an application modifies one of these three
        * fields of _res before res_init() is called, res_init() will not
        * alter them.  Of course, if an application is setting them to
        * _zero_ before calling res_init(), hoping to override what used
        * to be the static default, we can't detect it and unexpected results
        * will follow.  Zero for any of these fields would make no sense,
        * so one can safely assume that the applications were already getting
        * unexpected results.
        *
        * _res.options is tricky since some apps were known to diddle the bits
        * before res_init() was first called. We can't replicate that semantic
        * with dynamic initialization (they may have turned bits off that are
        * set in RES_DEFAULT).  Our solution is to declare such applications
        * "broken".  They could fool us by setting RES_INIT but none do (yet).
        */
       if (!_res.retrans)
              _res.retrans = RES_TIMEOUT;
       if (!_res.retry)
              _res.retry = 4;
       if (!(_res.options & RES_INIT))
              _res.options = RES_DEFAULT;

       /*
        * This one used to initialize implicitly to zero, so unless the app
        * has set it to something in particular, we can randomize it now.
        */
       if (!_res.id)
              _res.id = res_randomid();

       return (__res_vinit(&_res, 1));
}

Definition at line 142 of file res_data.c.

                                                  {
       if (__res_maybe_init (&_res, 0) == -1)
              return;

       res_pquery(&_res, msg, len, file);
}

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Definition at line 151 of file res_data.c.

{
       if (__res_maybe_init (&_res, 1) == -1) {
              RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
              return (-1);
       }
       return (res_nmkquery(&_res, op, dname, class, type,
                          data, datalen,
                          newrr_in, buf, buflen));
}

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void p_query ( const u_char msg)

Definition at line 134 of file res_data.c.

                           {
       fp_query(msg, stdout);
}
void res_close ( void  )

Definition at line 237 of file res_data.c.

                {
#ifdef _LIBC
       /*
        * Some stupid programs out there call res_close() before res_init().
        * Since _res._vcsock isn't explicitly initialized, these means that
        * we could do a close(0), which might lead to some security problems.
        * Therefore we check if res_init() was called before by looking at
        * the RES_INIT bit in _res.options.  If it hasn't been set we bail out
        * early.  */
       if ((_res.options & RES_INIT) == 0)
         return;
#endif
       /* We don't free the name server addresses because we never
          did it and it would be done implicitly on shutdown.  */
       __res_iclose(&_res, false);
}

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int res_isourserver ( const struct sockaddr_in inp)

Definition at line 208 of file res_data.c.

                                               {
       return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp));
}

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int res_query ( const char *  name,
int  class,
int  type,
u_char answer,
int  anslen 
)

Definition at line 185 of file res_data.c.

{
       if (__res_maybe_init (&_res, 1) == -1) {
              RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
              return (-1);
       }
       return (res_nquery(&_res, name, class, type, answer, anslen));
}

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int res_querydomain ( const char *  name,
const char *  domain,
int  class,
int  type,
u_char answer,
int  anslen 
)

Definition at line 281 of file res_data.c.

{
       if (__res_maybe_init (&_res, 1) == -1) {
              RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
              return (-1);
       }

       return (res_nquerydomain(&_res, name, domain,
                             class, type,
                             answer, anslen));
}

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int res_search ( const char *  name,
int  class,
int  type,
u_char answer,
int  anslen 
)

Definition at line 267 of file res_data.c.

{
       if (__res_maybe_init (&_res, 1) == -1) {
              RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
              return (-1);
       }

       return (res_nsearch(&_res, name, class, type, answer, anslen));
}

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int res_send ( const u_char buf,
int  buflen,
u_char ans,
int  anssiz 
)

Definition at line 213 of file res_data.c.

                                                                 {
       if (__res_maybe_init (&_res, 1) == -1) {
              /* errno should have been set by res_init() in this case. */
              return (-1);
       }

       return (res_nsend(&_res, buf, buflen, ans, anssiz));
}

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Definition at line 198 of file res_data.c.

                                       {
       _res.qhook = hook;
}

Definition at line 203 of file res_data.c.

                                       {
       _res.rhook = hook;
}
int res_sendsigned ( const u_char buf,
int  buflen,
ns_tsig_key key,
u_char ans,
int  anssiz 
)

Definition at line 224 of file res_data.c.

{
       if (__res_maybe_init (&_res, 1) == -1) {
              /* errno should have been set by res_init() in this case. */
              return (-1);
       }

       return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
}

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Variable Documentation

Initial value:
 {
       "QUERY",
       "IQUERY",
       "CQUERYM",
       "CQUERYU",    
       "NOTIFY",     
       "UPDATE",
       "6",
       "7",
       "8",
       "9",
       "10",
       "11",
       "12",
       "13",
       "ZONEINIT",
       "ZONEREF",
}

Definition at line 42 of file res_data.c.