Line data    Source code

       1             : #include "fd_resolv.h"
       2             : #include "../fd_fqdn.h"
       3             : #include "../../util/log/fd_log.h" /* fd_tickcount() support */
       4             : #include <string.h>
       5             : 
       6             : #pragma GCC diagnostic ignored "-Wconversion"
       7             : #pragma GCC diagnostic ignored "-Wsign-compare"
       8             : #pragma GCC diagnostic ignored "-Wsign-conversion"
       9             : 
      10             : int
      11             : fd_res_mkquery( int           op,
      12             :                 char const *  dname,
      13             :                 int           class,
      14             :                 int           type,
      15             :                 uchar *       buf,
      16           0 :                 int           buflen ) {
      17           0 :   size_t l = strnlen( dname, FD_FQDN_BUF_MAX-1UL );
      18             : 
      19           0 :   if( l && dname[l-1]=='.' ) l--;
      20           0 :   if( l && dname[l-1]=='.' ) return -1;
      21           0 :   int n = 17+l+!!l;
      22           0 :   if( l>253 || buflen<n || op>15u || class>255u || type>255u )
      23           0 :     return -1;
      24             : 
      25             :   /* Construct query template - ID will be filled later */
      26           0 :   uchar q[280];
      27           0 :   memset( q, 0, n );
      28           0 :   q[2] = op*8 + 1;
      29           0 :   q[3] = 32; /* AD */
      30           0 :   q[5] = 1;
      31           0 :   memcpy( (char *)q+13, dname, l );
      32           0 :   int i, j;
      33           0 :   for( i=13; q[i]; i=j+1 ) {
      34           0 :     for( j=i; q[j] && q[j] != '.'; j++ );
      35           0 :     if( j-i-1u > 62u ) return -1;
      36           0 :     q[i-1] = j-i;
      37           0 :   }
      38           0 :   q[i+1] = type;
      39           0 :   q[i+3] = class;
      40             : 
      41             :   /* Make a reasonably unpredictable id */
      42           0 :   ulong ts = fd_ulong_hash( (ulong)fd_tickcount() );
      43           0 :   q[0] = (uchar)( ts    );
      44           0 :   q[1] = (uchar)( ts>>8 );
      45             : 
      46           0 :   memcpy( buf, q, n );
      47           0 :   return n;
      48           0 : }