vde-2/src/vde_over_ns/dns.h

   1 /* ----------------------------------------------------------------------------
   2  *
   3     VDE_OVER_NS
   4         (C) 2007 Daniele Lacamera
   5
   6     Derived from:
   7     NSTX -- tunneling network-packets over DNS
   8
   9      (C) 2000 by Florian Heinz and Julien Oster
  10
  11     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License version 2, as
  13     published by the Free Software Foundation.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program; if not, write to the Free Software
  22     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24   -------------------------------------------------------------------------- */
  25 #ifndef _NSTXDNS_H
  26 #define _NSTXDNS_H
  27
  28 #define DNS_QUERY    0x01
  29 #define DNS_RESPONSE 0x02
  30
  31 #define DNS_MAXPKT 512
  32
  33 struct rr
  34 {
  35    char *data;
  36    int len;
  37    int link;
  38
  39    struct rr *next;
  40 };
  41
  42 struct dnspkt
  43 {
  44    unsigned short id;
  45    int type;
  46    struct rr *query;
  47    struct rr *answer;
  48 };
  49
  50 void dns_setsuffix (char *);
  51
  52 struct dnspkt *dns_alloc (void);
  53 void dns_free (struct dnspkt *);
  54
  55 void dns_setid (struct dnspkt *, unsigned short);
  56 void dns_settype (struct dnspkt *, int);
  57 int dns_addquery (struct dnspkt *, const char *);
  58 int dns_addanswer (struct dnspkt *, const char *, int, int);
  59
  60 int dns_getpktsize (const struct dnspkt *);
  61 struct dnspkt *dns_extractpkt (const unsigned char *, int);
  62 const char *dns_getquerydata (struct dnspkt *);
  63 char *dns_getanswerdata (struct dnspkt *, int *);
  64
  65 const char *dns_fqdn2data (const char *);
  66 const char *dns_data2fqdn (const char *);
  67
  68 const unsigned char *txt2data (const unsigned char *, int *);
  69 unsigned char *dns_constructpacket (struct dnspkt *, int *);
  70
  71 int dns_getfreespace (const struct dnspkt *, int);
  72
  73 #endif /* _NSTXDNS_H */