getsrv (const char *name,struct srventry **list)
{
  int srvcount=0;
  u16 count;
  int i, rc;

  *list = NULL;

#ifdef USE_ADNS
  {
    adns_state state;
    adns_answer *answer = NULL;

    rc = adns_init (&state, adns_if_noerrprint, NULL);
    if (rc)
      {
        log_error ("error initializing adns: %s\n", strerror (errno));
        return -1;
      }

    rc = adns_synchronous (state, name, adns_r_srv, adns_qf_quoteok_query,
                           &answer);
    if (rc)
      {
        log_error ("DNS query failed: %s\n", strerror (errno));
        adns_finish (state);
        return -1;
      }
    if (answer->status != adns_s_ok
        || answer->type != adns_r_srv || !answer->nrrs)
      {
        log_error ("DNS query returned an error or no records: %s (%s)\n",
                   adns_strerror (answer->status),
                   adns_errabbrev (answer->status));
        adns_free (answer);
        adns_finish (state);
        return 0;
      }

    for (count = 0; count < answer->nrrs; count++)
      {
        struct srventry *srv = NULL;
        struct srventry *newlist;

        if (strlen (answer->rrs.srvha[count].ha.host) >= MAXDNAME)
          {
            log_info ("hostname in SRV record too long - skipped\n");
            continue;
          }

        newlist = xtryrealloc (*list, (srvcount+1)*sizeof(struct srventry));
        if (!newlist)
          goto fail;
        *list = newlist;
        memset (&(*list)[srvcount], 0, sizeof(struct srventry));
        srv = &(*list)[srvcount];
        srvcount++;

        srv->priority = answer->rrs.srvha[count].priority;
        srv->weight   = answer->rrs.srvha[count].weight;
        srv->port     = answer->rrs.srvha[count].port;
        strcpy (srv->target, answer->rrs.srvha[count].ha.host);
      }

    adns_free (answer);
    adns_finish (state);
  }
#else /*!USE_ADNS*/
  {
    unsigned char answer[2048];
    HEADER *header = (HEADER *)answer;
    unsigned char *pt, *emsg;
    int r;
    u16 dlen;

    r = res_query (name, C_IN, T_SRV, answer, sizeof answer);
    if (r < sizeof (HEADER) || r > sizeof answer)
      return -1;
    if (header->rcode != NOERROR || !(count=ntohs (header->ancount)))
      return 0; /* Error or no record found.  */

    emsg = &answer[r];
    pt = &answer[sizeof(HEADER)];

    /* Skip over the query */
    rc = dn_skipname (pt, emsg);
    if (rc == -1)
      goto fail;

    pt += rc + QFIXEDSZ;

    while (count-- > 0 && pt < emsg)
      {
        struct srventry *srv=NULL;
        u16 type,class;
        struct srventry *newlist;

        newlist = xtryrealloc (*list, (srvcount+1)*sizeof(struct srventry));
        if (!newlist)
          goto fail;
        *list = newlist;
        memset(&(*list)[srvcount],0,sizeof(struct srventry));
        srv=&(*list)[srvcount];
        srvcount++;

        rc = dn_skipname(pt,emsg); /* the name we just queried for */
        if (rc == -1)
          goto fail;
        pt+=rc;

        /* Truncated message? */
        if((emsg-pt)<16)
          goto fail;

        type = buf16_to_u16 (pt);
        pt += 2;
        /* We asked for SRV and got something else !? */
        if(type!=T_SRV)
          goto fail;

        class = buf16_to_u16 (pt);
        pt += 2;
        /* We asked for IN and got something else !? */
        if(class!=C_IN)
          goto fail;

        pt += 4; /* ttl */
        dlen = buf16_to_u16 (pt);
        pt += 2;

        srv->priority = buf16_to_ushort (pt);
        pt += 2;
        srv->weight = buf16_to_ushort (pt);
        pt += 2;
        srv->port = buf16_to_ushort (pt);
        pt += 2;

        /* Get the name.  2782 doesn't allow name compression, but
           dn_expand still works to pull the name out of the
           packet. */
        rc = dn_expand(answer,emsg,pt,srv->target,MAXDNAME);
        if (rc == 1 && srv->target[0] == 0) /* "." */
          {
            xfree(*list);
            *list = NULL;
            return 0;
          }
        if (rc == -1)
          goto fail;
        pt += rc;
        /* Corrupt packet? */
        if (dlen != rc+6)
          goto fail;
      }
  }
#endif /*!USE_ADNS*/

  /* Now we have an array of all the srv records. */

  /* Order by priority */
  qsort(*list,srvcount,sizeof(struct srventry),priosort);

  /* For each priority, move the zero-weighted items first. */
  for (i=0; i < srvcount; i++)
    {
      int j;

      for (j=i;j < srvcount && (*list)[i].priority == (*list)[j].priority; j++)
        {
          if((*list)[j].weight==0)
            {
              /* Swap j with i */
              if(j!=i)
                {
                  struct srventry temp;

                  memcpy (&temp,&(*list)[j],sizeof(struct srventry));
                  memcpy (&(*list)[j],&(*list)[i],sizeof(struct srventry));
                  memcpy (&(*list)[i],&temp,sizeof(struct srventry));
                }

              break;
            }
        }
    }

  /* Run the RFC-2782 weighting algorithm.  We don't need very high
     quality randomness for this, so regular libc srand/rand is
     sufficient.  Fixme: It is a bit questionaly to reinitalize srand
     - better use a gnupg fucntion for this.  */
  srand(time(NULL)*getpid());

  for (i=0; i < srvcount; i++)
    {
      int j;
      float prio_count=0,chose;

      for (j=i; j < srvcount && (*list)[i].priority == (*list)[j].priority; j++)
        {
          prio_count+=(*list)[j].weight;
          (*list)[j].run_count=prio_count;
        }

      chose=prio_count*rand()/RAND_MAX;

      for (j=i;j<srvcount && (*list)[i].priority==(*list)[j].priority;j++)
        {
          if (chose<=(*list)[j].run_count)
            {
              /* Swap j with i */
              if(j!=i)
                {
                  struct srventry temp;

                  memcpy(&temp,&(*list)[j],sizeof(struct srventry));
                  memcpy(&(*list)[j],&(*list)[i],sizeof(struct srventry));
                  memcpy(&(*list)[i],&temp,sizeof(struct srventry));
                }
              break;
            }
        }
    }

  return srvcount;

 fail:
  xfree(*list);
  *list=NULL;
  return -1;
}