392 lines
14 KiB
C
392 lines
14 KiB
C
/*
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* from ns.h 4.33 (Berkeley) 8/23/90
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* $Id: ns_defs.h,v 1.2 1995/05/30 03:48:47 rgrimes Exp $
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*/
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/*
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* ++Copyright++ 1986
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* -
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* Copyright (c) 1986
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* -
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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* -
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* --Copyright--
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*/
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/*
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* Global definitions for the name server.
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*/
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/*
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* Effort has been expended here to make all structure members 32 bits or
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* larger land on 32-bit boundaries; smaller structure members have been
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* deliberately shuffled and smaller integer sizes chosen where possible
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* to make sure this happens. This is all meant to avoid structure member
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* padding which can cost a _lot_ of memory when you have hundreds of
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* thousands of entries in your cache.
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*/
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/*
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* Timeout time should be around 1 minute or so. Using the
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* the current simplistic backoff strategy, the sequence
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* retrys after 4, 8, and 16 seconds. With 3 servers, this
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* dies out in a little more than a minute.
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* (sequence RETRYBASE, 2*RETRYBASE, 4*RETRYBASE... for MAXRETRY)
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*/
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#define MINROOTS 2 /* min number of root hints */
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#define NSMAX 16 /* max number of NS addrs to try ([0..255]) */
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#define RETRYBASE 4 /* base time between retries */
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#define MAXCLASS 255 /* XXX - may belong elsewhere */
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#define MAXRETRY 3 /* max number of retries per addr */
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#define MAXCNAMES 8 /* max # of CNAMES tried per addr */
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#define MAXQUERIES 20 /* max # of queries to be made */
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#define MAXQSERIAL 4 /* max # of outstanding QSERIAL's */
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/* (prevent "recursive" loops) */
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#define INIT_REFRESH 600 /* retry time for initial secondary */
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/* contact (10 minutes) */
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#define NADDRECS 20 /* max addt'l rr's per resp */
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#define XFER_TIMER 120 /* named-xfer's connect timeout */
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#define MAX_XFER_TIME 60*60*2 /* max seconds for an xfer */
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#define XFER_TIME_FUDGE 10 /* MAX_XFER_TIME fudge */
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#define MAX_XFERS_RUNNING 10 /* default max value of xfers_running */
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#define MAX_XFERS_PER_NS 2 /* max # of xfers per peer nameserver */
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#define XFER_BUFSIZE (16*1024) /* arbitrary but bigger than most MTU's */
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#define ALPHA 0.7 /* How much to preserve of old response time */
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#define BETA 1.2 /* How much to penalize response time on failure */
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#define GAMMA 0.98 /* How much to decay unused response times */
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/* sequence-space arithmetic */
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#define SEQ_GT(a,b) ((int32_t)((a)-(b)) > 0)
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/* these fields are ordered to maintain word-alignment;
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* be careful about changing them.
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*/
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struct zoneinfo {
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char *z_origin; /* root domain name of zone */
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time_t z_time; /* time for next refresh */
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time_t z_lastupdate; /* time of last refresh */
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u_int32_t z_refresh; /* refresh interval */
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u_int32_t z_retry; /* refresh retry interval */
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u_int32_t z_expire; /* expiration time for cached info */
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u_int32_t z_minimum; /* minimum TTL value */
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u_int32_t z_serial; /* changes if zone modified */
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char *z_source; /* source location of data */
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time_t z_ftime; /* modification time of source file */
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struct in_addr z_xaddr; /* override server for next xfer */
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struct in_addr z_addr[NSMAX]; /* list of master servers for zone */
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u_char z_addrcnt; /* number of entries in z_addr[] */
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u_char z_type; /* type of zone; see below */
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u_int16_t z_flags; /* state bits; see below */
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pid_t z_xferpid; /* xfer child pid */
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int z_class; /* class of zone */
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#ifdef SECURE_ZONES
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struct netinfo *secure_nets; /* list of secure networks for zone */
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#endif
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#ifdef BIND_NOTIFY
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/* XXX - this will have to move to the name when we do !SOA notify */
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struct notify *z_notifylist; /* list of servers we should notify */
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#endif
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};
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#ifdef BIND_NOTIFY
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struct notify {
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struct in_addr addr; /* of server */
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time_t last; /* when they asked */
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struct notify *next;
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/* XXX - this will need a type field when we do !SOA notify */
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};
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#endif
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/* zone types (z_type) */
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#define Z_NIL 0 /* zone slot not in use */
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#define Z_PRIMARY 1
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#define Z_SECONDARY 2
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#define Z_CACHE 3
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#define Z_STUB 4
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/* zone state bits (16 bits) */
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#define Z_AUTH 0x0001 /* zone is authoritative */
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#define Z_NEED_XFER 0x0002 /* waiting to do xfer */
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#define Z_XFER_RUNNING 0x0004 /* asynch. xfer is running */
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#define Z_NEED_RELOAD 0x0008 /* waiting to do reload */
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#define Z_SYSLOGGED 0x0010 /* have logged timeout */
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#define Z_QSERIAL 0x0020 /* sysquery()'ing for serial number */
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#define Z_FOUND 0x0040 /* found in boot file when reloading */
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#define Z_INCLUDE 0x0080 /* set if include used in file */
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#define Z_DB_BAD 0x0100 /* errors when loading file */
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#define Z_TMP_FILE 0x0200 /* backup file for xfer is temporary */
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#ifdef ALLOW_UPDATES
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#define Z_DYNAMIC 0x0400 /* allow dynamic updates */
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#define Z_DYNADDONLY 0x0800 /* dynamic mode: add new data only */
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#define Z_CHANGED 0x1000 /* zone has changed */
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#endif /* ALLOW_UPDATES */
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/* named_xfer exit codes */
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#define XFER_UPTODATE 0 /* zone is up-to-date */
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#define XFER_SUCCESS 1 /* performed transfer successfully */
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#define XFER_TIMEOUT 2 /* no server reachable/xfer timeout */
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#define XFER_FAIL 3 /* other failure, has been logged */
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#include <sys/time.h>
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/* XXX - "struct qserv" is deprecated in favor of "struct nameser" */
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struct qserv {
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struct sockaddr_in
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ns_addr; /* address of NS */
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struct databuf *ns; /* databuf for NS record */
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struct databuf *nsdata; /* databuf for server address */
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struct timeval stime; /* time first query started */
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int nretry; /* # of times addr retried */
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};
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/*
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* Structure for recording info on forwarded or generated queries.
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*/
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struct qinfo {
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u_int16_t q_id; /* id of query */
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u_int16_t q_nsid; /* id of forwarded query */
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struct sockaddr_in
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q_from; /* requestor's address */
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u_char *q_msg, /* the message */
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*q_cmsg; /* the cname message */
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int16_t q_msglen, /* len of message */
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q_cmsglen; /* len of cname message */
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int16_t q_dfd; /* UDP file descriptor */
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struct fwdinfo *q_fwd; /* last forwarder used */
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time_t q_time; /* time to retry */
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time_t q_expire; /* time to expire */
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struct qinfo *q_next; /* rexmit list (sorted by time) */
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struct qinfo *q_link; /* storage list (random order) */
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struct databuf *q_usedns[NSMAX]; /* databuf for NS that we've tried */
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struct qserv q_addr[NSMAX]; /* addresses of NS's */
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#ifdef notyet
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struct nameser *q_ns[NSMAX]; /* name servers */
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#endif
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u_char q_naddr; /* number of addr's in q_addr */
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u_char q_curaddr; /* last addr sent to */
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u_char q_nusedns; /* number of elements in q_usedns[] */
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u_int8_t q_flags; /* see below */
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int16_t q_cname; /* # of cnames found */
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int16_t q_nqueries; /* # of queries required */
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struct qstream *q_stream; /* TCP stream, null if UDP */
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struct zoneinfo *q_zquery; /* Zone query is about (Q_ZSERIAL) */
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#ifdef LAME_DELEGATION
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char q_domain[MAXDNAME]; /* domain for servers we are querying */
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#endif
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#ifdef BIND_NOTIFY
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int q_notifyzone; /* zone which needs a sysnotify()
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* when the reply to this comes in.
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*/
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#endif
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};
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/* q_flags bits (8 bits) */
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#define Q_SYSTEM 0x01 /* is a system query */
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#define Q_PRIMING 0x02 /* generated during priming phase */
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#define Q_ZSERIAL 0x04 /* getting zone serial for xfer test */
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#define Q_NEXTADDR(qp,n) \
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(((qp)->q_fwd == (struct fwdinfo *)0) ? \
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&(qp)->q_addr[n].ns_addr : &(qp)->q_fwd->fwdaddr)
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#define RETRY_TIMEOUT 45
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#define QINFO_NULL ((struct qinfo *)0)
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/*
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* Return codes from ns_forw:
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*/
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#define FW_OK 0
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#define FW_DUP 1
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#define FW_NOSERVER 2
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#define FW_SERVFAIL 3
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struct qstream {
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int s_rfd; /* stream file descriptor */
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int s_size; /* expected amount of data to recive */
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int s_bufsize; /* amount of data recived in s_buf */
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u_char *s_buf; /* buffer of received data */
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u_char *s_bufp; /* pointer into s_buf of recived data*/
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struct qstream *s_next; /* next stream */
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struct sockaddr_in
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s_from; /* address query came from */
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u_int32_t s_time; /* time stamp of last transaction */
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int s_refcnt; /* number of outstanding queries */
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u_int16_t s_tempsize; /* temporary for size from net */
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};
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#define QSTREAM_NULL ((struct qstream *)0)
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struct qdatagram {
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int dq_dfd; /* datagram file descriptor */
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time_t dq_gen; /* generation number */
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struct qdatagram
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*dq_next; /* next datagram */
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struct in_addr dq_addr; /* interface address */
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};
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#define QDATAGRAM_NULL ((struct qdatagram *)0)
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struct netinfo {
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struct netinfo *next;
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u_int32_t addr;
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u_int32_t mask;
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struct in_addr my_addr;
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};
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#define ALLOW_NETS 0x0001
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#define ALLOW_HOSTS 0x0002
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#define ALLOW_ALL (ALLOW_NETS | ALLOW_HOSTS)
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struct fwdinfo {
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struct fwdinfo *next;
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struct sockaddr_in
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fwdaddr;
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};
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enum nameserStats { nssRcvdQ, /* sent us a query */
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nssRcvdR, /* sent us an answer */
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nssRcvdIQ, /* sent us an inverse query */
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nssRcvdNXD, /* sent us a negative response */
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nssRcvdFwdQ, /* sent us a query we had to fwd */
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nssRcvdFwdR, /* sent us a response we had to fwd */
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nssRcvdDupQ, /* sent us a retry */
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nssRcvdDupR, /* sent us an extra answer */
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nssRcvdFail, /* sent us a SERVFAIL */
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nssRcvdFErr, /* sent us a FORMERR */
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nssRcvdErr, /* sent us some other error */
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nssRcvdTCP, /* sent us a query using TCP */
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nssRcvdAXFR, /* sent us an AXFR */
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nssRcvdLDel, /* sent us a lame delegation */
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nssRcvdOpts, /* sent us some IP options */
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nssSentSysQ, /* sent them a sysquery */
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nssSentAns, /* sent them an answer */
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nssSentFwdQ, /* fwdd a query to them */
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nssSentFwdR, /* fwdd a response to them */
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nssSentDupQ, /* sent them a retry */
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nssSentFail, /* sent them a SERVFAIL */
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nssSentFErr, /* sent them a FORMERR */
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nssSendtoErr, /* error in sendto */
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#ifdef XSTATS
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nssNotNsQ, /* query received from remote port != ns_port */
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nssSentNaAns, /* sent them a non autoritative answer */
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nssSentNXD, /* sent them a negative response */
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#endif
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nssLast };
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struct nameser {
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struct in_addr addr; /* key */
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u_long stats[nssLast]; /* statistics */
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#ifdef notyet
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u_int32_t rtt; /* round trip time */
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/* XXX - need to add more stuff from "struct qserv", and use our rtt */
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u_int16_t flags; /* see below */
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#endif
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u_int8_t xfers; /* #/xfers running right now */
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};
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#ifdef NCACHE
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#define NOERROR_NODATA 6 /* only used internally by the server, used for
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* -ve $ing non-existence of records. 6 is not
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* a code used as yet anyway. anant@isi.edu
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*/
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#define NTTL 600 /* ttl for negative data: 10 minutes? */
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#endif /*NCACHE*/
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#define VQEXPIRY 900 /* a VQ entry expires in 15*60 = 900 seconds */
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#ifdef VALIDATE
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#define INVALID 0
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#define VALID_NO_CACHE 1
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#define VALID_CACHE 2
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#define MAXNAMECACHE 100
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#define MAXVQ 100 /* Max number of elements in TO_Validate queue */
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struct _nameaddr {
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struct in_addr ns_addr;
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char *nsname;
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};
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typedef struct _nameaddr NAMEADDR;
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struct _to_validate {
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int16_t class; /* Name Class */
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int16_t type; /* RR type */
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char *data; /* RR data */
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char *dname; /* Name */
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time_t time; /* time at which inserted in queue */
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struct _to_validate
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*next,
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*prev;
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};
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typedef struct _to_validate TO_Validate;
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#endif /*VALIDATE*/
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#ifdef DEBUG
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# define dprintf(lev, args) (ddt && (debug >= lev) && fprintf args)
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#else
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# define dprintf(lev, args)
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#endif
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#ifdef INIT
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error "INIT already defined, check system include files"
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#endif
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#ifdef DECL
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error "DECL already defined, check system include files"
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#endif
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#ifdef MAIN_PROGRAM
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#define INIT(x) = x
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#define DECL
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#else
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#define INIT(x)
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#define DECL extern
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#endif
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