programs/pluto/adns.h

   1 /* Pluto Asynchronous DNS Helper Program's Header
   2  * Copyright (C) 2002  D. Hugh Redelmeier.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * RCSID $Id: adns.h,v 1.1 2004/03/15 20:35:28 as Exp $
  15  */
  16
  17 #ifndef USE_LWRES       /* whole file! */
  18
  19 /* The interface in RHL6.x and BIND distribution 8.2.2 are different,
  20  * so we build some of our own :-(
  21  */
  22
  23 # ifndef NS_MAXDNAME
  24 #   define NS_MAXDNAME MAXDNAME /* I hope this is long enough for IPv6 */
  25 # endif
  26
  27 # ifndef NS_PACKETSZ
  28 #   define NS_PACKETSZ PACKETSZ
  29 # endif
  30
  31 /* protocol version */
  32
  33 #define ADNS_Q_MAGIC (((((('d' << 8) + 'n') << 8) + 's') << 8) + 4)
  34 #define ADNS_A_MAGIC (((((('d' << 8) + 'n') << 8) + 's') << 8) + 128 + 4)
  35
  36 /* note: both struct adns_query and struct adns_answer must start with
  37  * size_t len;
  38  */
  39
  40 struct adns_query {
  41     size_t len;
  42     unsigned int qmagic;
  43     unsigned long serial;
  44     lset_t debugging;   /* only used #ifdef DEBUG, but don't want layout to change */
  45     u_char name_buf[NS_MAXDNAME + 2];
  46     int type;   /* T_KEY or T_TXT */
  47 };
  48
  49 struct adns_answer {
  50     size_t len;
  51     unsigned int amagic;
  52     unsigned long serial;
  53     struct adns_continuation *continuation;
  54     int result;
  55     int h_errno_val;
  56     u_char ans[NS_PACKETSZ * 10];   /* very probably bigger than necessary */
  57 };
  58
  59 enum helper_exit_status {
  60     HES_CONTINUE = -1,  /* not an exit */
  61     HES_OK = 0, /* all's well that ends well (perhaps EOF) */
  62     HES_INVOCATION,     /* improper invocation */
  63     HES_IO_ERROR_SELECT,        /* IO error in select() */
  64     HES_MALLOC, /* malloc failed */
  65     HES_IO_ERROR_IN,    /* error reading pipe */
  66     HES_IO_ERROR_OUT,   /* error reading pipe */
  67     HES_PIPE,   /* pipe(2) failed */
  68     HES_SYNC,   /* answer from worker doesn't match query */
  69     HES_FORK,   /* fork(2) failed */
  70     HES_RES_INIT,       /* resolver initialization failed */
  71     HES_BAD_LEN,        /* implausible .len field */
  72     HES_BAD_MAGIC,      /* .magic field wrong */
  73 };
  74
  75 #endif /* !USE_LWRES */