290 lines
9.7 KiB
C
290 lines
9.7 KiB
C
/*
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* Copyright (c) 1985, 1990 Regents of the University of California.
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* 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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* @(#)ns.h 4.33 (Berkeley) 8/23/90
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*/
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/*
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* Global definitions and variables for the name server.
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*/
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#include <arpa/inet.h>
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#include <string.h>
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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 */
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#define RETRYBASE 4 /* base time between retries */
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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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/* (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 ALPHA 0.7 /* How much to preserver 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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struct zoneinfo {
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int z_type; /* type of zone */
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int z_auth; /* zone is authoritative */
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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_long z_refresh; /* refresh interval */
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u_long z_retry; /* refresh retry interval */
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u_long z_expire; /* expiration time for cached info */
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u_long z_minimum; /* minimum TTL value */
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u_long 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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int z_addrcnt; /* address count */
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struct in_addr z_addr[NSMAX]; /* list of master servers for zone */
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int z_state; /* state bits; see below */
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u_short z_xferpid; /* xfer child pid */
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#ifdef ALLOW_UPDATES
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int hasChanged; /* non-zero if zone has been updated
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* since last checkpoint
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*/
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#endif ALLOW_UPDATES
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};
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/* zone types (z_type) */
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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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/* zone state bits */
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#define Z_AUTH 0x01 /* should replace z_auth */
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#define Z_NEED_XFER 0x02 /* waiting to do xfer */
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#define Z_XFER_RUNNING 0x04 /* asynch. xfer is running */
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#define Z_NEED_RELOAD 0x08 /* waiting to do reload */
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#define Z_SYSLOGGED 0x10 /* have logged timeout */
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#define Z_CHANGED 0x20 /* should replace hasChanged */
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#define Z_FOUND 0x40 /* found in boot file when reloading */
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#define Z_INCLUDE 0x80 /* set if include used in file */
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#define Z_DB_BAD 0x100 /* errors when loading file */
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#define Z_TMP_FILE 0x200 /* backup file for xfer is temporary */
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#ifdef ALLOW_UPDATES
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#define Z_DYNAMIC 0x400 /* allow dynamic updates */
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#define Z_DYNADDONLY 0x800 /* dynamic mode: add new data only */
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#endif ALLOW_UPDATES
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/* 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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/*
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* Structure for recording info on forwarded queries.
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*/
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struct qinfo {
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u_short q_id; /* id of query */
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u_short q_nsid; /* id of forwarded query */
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int q_dfd; /* UDP file descriptor */
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struct sockaddr_in q_from; /* requestor's address */
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char *q_msg; /* the message */
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int q_msglen; /* len of message */
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int q_naddr; /* number of addr's in q_addr */
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int q_curaddr; /* last addr sent to */
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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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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 qserv {
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struct sockaddr_in ns_addr; /* addresses of NS's */
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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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} q_addr[NSMAX]; /* addresses of NS's */
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struct databuf *q_usedns[NSMAX]; /* databuf for NS that we've tried */
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int q_nusedns;
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int q_cname; /* # of cnames found */
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int q_nqueries; /* # of queries required */
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char *q_cmsg; /* the cname message */
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int q_cmsglen; /* len of cname message */
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struct qstream *q_stream; /* TCP stream, null if UDP */
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int q_system; /* boolean, system query */
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};
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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 PRIMING_CACHE 42
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#define QINFO_NULL ((struct qinfo *)0)
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#ifndef XFER
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extern struct qinfo *qfindid();
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extern struct qinfo *qnew();
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extern struct qinfo *retryqp; /* next query to retry */
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#endif /* XFER */
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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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char *s_buf; /* buffer of recived data */
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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 s_from; /* address query came from */
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u_long s_time; /* time stamp of last transaction */
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int s_refcnt; /* number of outstanding queries */
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u_short 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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extern struct qstream *streamq; /* stream queue */
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struct qdatagram {
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int dq_dfd; /* datagram file descriptor */
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struct qdatagram *dq_next; /* next datagram */
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struct in_addr dq_addr; /* address of interface */
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};
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#define QDATAGRAM_NULL ((struct qdatagram *)0)
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extern struct qdatagram *datagramq; /* datagram queue */
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struct netinfo {
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struct netinfo *next;
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u_long net;
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u_long mask;
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struct in_addr my_addr;
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};
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struct fwdinfo {
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struct fwdinfo *next;
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struct sockaddr_in fwdaddr;
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};
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struct nets {
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char *name;
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long net;
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struct nets *next;
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};
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/*
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* Statistics Defines
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*/
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struct stats {
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unsigned long cnt;
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char *description;
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};
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/* gross count of UDP packets in and out */
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#define S_INPKTS 0
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#define S_OUTPKTS 1
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/* gross count of queries and inverse queries received */
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#define S_QUERIES 2
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#define S_IQUERIES 3
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#define S_DUPQUERIES 4
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#define S_RESPONSES 5
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#define S_DUPRESP 6
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#define S_RESPOK 7
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#define S_RESPFAIL 8
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#define S_RESPFORMERR 9
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#define S_SYSQUERIES 10
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#define S_PRIMECACHE 11
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#define S_CHECKNS 12
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#define S_BADRESPONSES 13
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#define S_MARTIANS 14
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#define S_NSTATS 15 /* Careful! */
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#ifdef STATS
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extern struct stats stats[S_NSTATS];
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extern unsigned long typestats[T_ANY+1];
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#endif
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/*
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* Attempt to configure for type of function returned by signal-catching
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* functions (which signal and sigvec.sv_handler take a pointer to).
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* This can guess for BSD; otherwise, define SIG_FN externally.
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*/
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#ifndef SIG_FN
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#ifdef BSD
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#if BSD >= 199006
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#define SIG_FN void /* signal-catching functions return void */
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#else
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#define SIG_FN int /* signal-catching functions return int */
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#endif
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#else /* BSD */
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#define SIG_FN void /* signal-catching functions return void */
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#endif /* BSD */
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#endif
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#ifdef DEBUG
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extern int debug; /* debug flag */
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extern FILE *ddt; /* debug file discriptor */
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#endif
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#ifndef XFER
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extern int ds; /* datagram socket */
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extern struct qdatagram *dqp;
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extern struct timeval tt; /* place to store time */
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extern struct itimerval ival; /* maintenance interval */
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extern struct zoneinfo *zones; /* zone information */
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extern int nzones; /* number of zones in use */
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extern int forward_only; /* true on slave server */
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#endif /* XFER */
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#ifdef vax
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extern u_short htons(), ntohs();
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extern u_long htonl(), ntohl();
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#endif
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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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#ifndef XFER
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extern int xfer_running_cnt; /* number of xfers running */
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extern int xfer_deferred_cnt; /* number of deferred xfers */
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#define MAX_XFERS_RUNNING 4 /* max value of xfer_running_cnt */
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#endif /* XFER */
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