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Annotation of 43BSDReno/usr.sbin/named/ns.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985, 1990 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  *
        !            19:  *     @(#)ns.h        4.31 (Berkeley) 6/1/90
        !            20:  */
        !            21: 
        !            22: /*
        !            23:  * Global definitions and variables for the name server.
        !            24:  */
        !            25: 
        !            26: #include <arpa/inet.h>
        !            27: #include <string.h>
        !            28: 
        !            29: /*
        !            30:  * Timeout time should be around 1 minute or so.  Using the
        !            31:  * the current simplistic backoff strategy, the sequence
        !            32:  * retrys after 4, 8, and 16 seconds.  With 3 servers, this
        !            33:  * dies out in a little more than a minute.
        !            34:  * (sequence RETRYBASE, 2*RETRYBASE, 4*RETRYBASE... for MAXRETRY)
        !            35:  */
        !            36: #define MINROOTS       2               /* min number of root hints */
        !            37: #define NSMAX          16              /* max number of NS addrs to try */
        !            38: #define RETRYBASE      4               /* base time between retries */
        !            39: #define MAXRETRY       3               /* max number of retries per addr */
        !            40: #define MAXCNAMES      8               /* max # of CNAMES tried per addr */
        !            41: #define MAXQUERIES     20              /* max # of queries to be made */
        !            42:                                        /* (prevent "recursive" loops) */
        !            43: #define        INIT_REFRESH    600             /* retry time for initial secondary */
        !            44:                                        /* contact (10 minutes) */
        !            45: 
        !            46: #define ALPHA    0.7   /* How much to preserver of old response time */
        !            47: #define        BETA     1.2    /* How much to penalize response time on failure */
        !            48: #define        GAMMA    0.98   /* How much to decay unused response times */
        !            49: 
        !            50: struct zoneinfo {
        !            51:        int     z_type;                 /* type of zone */
        !            52:        int     z_auth;                 /* zone is authoritative */
        !            53:        char    *z_origin;              /* root domain name of zone */
        !            54:        time_t  z_time;                 /* time for next refresh */
        !            55:        time_t  z_lastupdate;           /* time of last refresh */
        !            56:        u_long  z_refresh;              /* refresh interval */
        !            57:        u_long  z_retry;                /* refresh retry interval */
        !            58:        u_long  z_expire;               /* expiration time for cached info */
        !            59:        u_long  z_minimum;              /* minimum TTL value */
        !            60:        u_long  z_serial;               /* changes if zone modified */
        !            61:        char    *z_source;              /* source location of data */
        !            62:        time_t  z_ftime;                /* modification time of source file */
        !            63:        int     z_addrcnt;              /* address count */
        !            64:        struct  in_addr z_addr[NSMAX];  /* list of master servers for zone */
        !            65:        int     z_state;                /* state bits; see below */
        !            66:        u_short z_xferpid;              /* xfer child pid */
        !            67: #ifdef ALLOW_UPDATES
        !            68:        int     hasChanged;             /* non-zero if zone has been updated
        !            69:                                         * since last checkpoint
        !            70:                                         */
        !            71: #endif ALLOW_UPDATES
        !            72: };
        !            73: 
        !            74:        /* zone types (z_type) */
        !            75: #define Z_PRIMARY      1
        !            76: #define Z_SECONDARY    2
        !            77: #define Z_CACHE                3
        !            78: 
        !            79:        /* zone state bits */
        !            80: #define        Z_AUTH          0x01            /* should replace z_auth */
        !            81: #define        Z_NEED_XFER     0x02            /* waiting to do xfer */
        !            82: #define        Z_XFER_RUNNING  0x04            /* asynch. xfer is running */
        !            83: #define        Z_NEED_RELOAD   0x08            /* waiting to do reload */
        !            84: #define        Z_SYSLOGGED     0x10            /* have logged timeout */
        !            85: #define        Z_CHANGED       0x20            /* should replace hasChanged */
        !            86: #define        Z_FOUND         0x40            /* found in boot file when reloading */
        !            87: #define        Z_INCLUDE       0x80            /* set if include used in file */
        !            88: #define        Z_DB_BAD        0x100           /* errors when loading file */
        !            89: #define        Z_TMP_FILE      0x200           /* backup file for xfer is temporary */
        !            90: #ifdef ALLOW_UPDATES
        !            91: #define        Z_DYNAMIC       0x400           /* allow dynamic updates */
        !            92: #define        Z_DYNADDONLY    0x800           /* dynamic mode: add new data only */
        !            93: #endif ALLOW_UPDATES
        !            94: 
        !            95:        /* xfer exit codes */
        !            96: #define        XFER_UPTODATE   0               /* zone is up-to-date */
        !            97: #define        XFER_SUCCESS    1               /* performed transfer successfully */
        !            98: #define        XFER_TIMEOUT    2               /* no server reachable/xfer timeout */
        !            99: #define        XFER_FAIL       3               /* other failure, has been logged */
        !           100: 
        !           101: /*
        !           102:  * Structure for recording info on forwarded queries.
        !           103:  */
        !           104: struct qinfo {
        !           105:        u_short q_id;                   /* id of query */
        !           106:        u_short q_nsid;                 /* id of forwarded query */
        !           107:        int     q_dfd;                  /* UDP file descriptor */
        !           108:        struct  sockaddr_in q_from;     /* requestor's address */
        !           109:        char    *q_msg;                 /* the message */
        !           110:        int     q_msglen;               /* len of message */
        !           111:        int     q_naddr;                /* number of addr's in q_addr */
        !           112:        int     q_curaddr;              /* last addr sent to */
        !           113:        struct  fwdinfo *q_fwd;         /* last forwarder used */
        !           114:        time_t  q_time;                 /* time to retry */
        !           115:        struct  qinfo *q_next;          /* rexmit list (sorted by time) */
        !           116:        struct  qinfo *q_link;          /* storage list (random order) */
        !           117:        struct  qserv {
        !           118:                struct  sockaddr_in ns_addr;    /* addresses of NS's */
        !           119:                struct  databuf *ns;    /* databuf for NS record */
        !           120:                struct  databuf *nsdata; /* databuf for server address */
        !           121:                struct  timeval stime;  /* time first query started */
        !           122:                int     nretry;         /* # of times addr retried */
        !           123:        } q_addr[NSMAX];                /* addresses of NS's */
        !           124:        struct  databuf *q_usedns[NSMAX]; /* databuf for NS that we've tried */
        !           125:        int     q_nusedns;
        !           126:        int     q_cname;                /* # of cnames found */
        !           127:        int     q_nqueries;             /* # of queries required */
        !           128:        char    *q_cmsg;                /* the cname message */
        !           129:        int     q_cmsglen;              /* len of cname message */
        !           130:        struct  qstream *q_stream;      /* TCP stream, null if UDP */
        !           131:        int     q_system;               /* boolean, system query */
        !           132: };
        !           133: 
        !           134: #define        Q_NEXTADDR(qp,n)        \
        !           135:        (((qp)->q_fwd == (struct fwdinfo *)0) ? \
        !           136:         &(qp)->q_addr[n].ns_addr : &(qp)->q_fwd->fwdaddr)
        !           137: 
        !           138: #define PRIMING_CACHE  42
        !           139: #define QINFO_NULL     ((struct qinfo *)0)
        !           140: 
        !           141: #ifndef XFER
        !           142: extern struct qinfo *qfindid();
        !           143: extern struct qinfo *qnew();
        !           144: extern struct qinfo *retryqp;          /* next query to retry */
        !           145: #endif /* XFER */
        !           146: 
        !           147: /*
        !           148:  * Return codes from ns_forw:
        !           149:  */
        !           150: #define        FW_OK           0
        !           151: #define        FW_DUP          1
        !           152: #define        FW_NOSERVER     2
        !           153: #define        FW_SERVFAIL     3
        !           154: 
        !           155: struct qstream {
        !           156:        int     s_rfd;                  /* stream file descriptor */
        !           157:        int     s_size;                 /* expected amount of data to recive */
        !           158:        int     s_bufsize;              /* amount of data recived in s_buf */
        !           159:        char    *s_buf;                 /* buffer of recived data */
        !           160:        char    *s_bufp;                /* pointer into s_buf of recived data */
        !           161:        struct  qstream *s_next;        /* next stream */
        !           162:        struct  sockaddr_in s_from;     /* address query came from */
        !           163:        u_long  s_time;                 /* time stamp of last transaction */
        !           164:        int     s_refcnt;               /* number of outstanding queries */
        !           165:        u_short s_tempsize;             /* temporary for size from net */
        !           166: };
        !           167: 
        !           168: #define QSTREAM_NULL   ((struct qstream *)0)
        !           169: extern struct qstream *streamq;                /* stream queue */
        !           170: 
        !           171: struct qdatagram {
        !           172:        int     dq_dfd;                 /* datagram file descriptor */
        !           173:        struct  qdatagram *dq_next;     /* next datagram */
        !           174:        struct  in_addr  dq_addr;       /* address of interface */
        !           175: };
        !           176: 
        !           177: #define QDATAGRAM_NULL ((struct qdatagram *)0)
        !           178: extern struct qdatagram *datagramq;    /* datagram queue */
        !           179: 
        !           180: struct netinfo {
        !           181:        struct netinfo *next;
        !           182:        u_long net;
        !           183:        u_long mask;
        !           184:        struct in_addr my_addr;
        !           185: };
        !           186: 
        !           187: struct fwdinfo {
        !           188:        struct fwdinfo *next;
        !           189:        struct sockaddr_in fwdaddr;
        !           190: };
        !           191: 
        !           192: struct nets {
        !           193:        char *name;
        !           194:        long net;
        !           195:        struct nets *next;
        !           196: }; 
        !           197: 
        !           198: /*
        !           199:  *  Statistics Defines
        !           200:  */
        !           201: struct stats {
        !           202:        unsigned long   cnt;
        !           203:        char    *description;
        !           204: };
        !           205: 
        !           206: /* gross count of UDP packets in and out */
        !           207: #define        S_INPKTS        0
        !           208: #define        S_OUTPKTS       1
        !           209: /* gross count of queries and inverse queries received */
        !           210: #define        S_QUERIES       2
        !           211: #define        S_IQUERIES      3
        !           212: #define S_DUPQUERIES   4
        !           213: #define        S_RESPONSES     5
        !           214: #define        S_DUPRESP       6
        !           215: #define        S_RESPOK        7
        !           216: #define        S_RESPFAIL      8
        !           217: #define        S_RESPFORMERR   9
        !           218: #define        S_SYSQUERIES    10
        !           219: #define        S_PRIMECACHE    11
        !           220: #define        S_CHECKNS       12
        !           221: #define        S_BADRESPONSES  13
        !           222: #define        S_MARTIANS      14
        !           223: #define S_NSTATS       15      /* Careful! */
        !           224: #ifdef STATS
        !           225: extern struct stats stats[S_NSTATS];
        !           226: extern unsigned long typestats[T_ANY+1];
        !           227: #endif
        !           228: 
        !           229: #ifndef VOID
        !           230: /* Support posix signals and old systems equally */
        !           231: #define VOID void
        !           232: #endif
        !           233: 
        !           234: #ifdef DEBUG
        !           235: extern int debug;                      /* debug flag */
        !           236: extern FILE *ddt;                      /* debug file discriptor */
        !           237: #endif
        !           238: #ifndef XFER
        !           239: extern int ds;                         /* datagram socket */
        !           240: extern struct qdatagram *dqp;
        !           241: extern struct timeval tt;              /* place to store time */
        !           242: 
        !           243: extern struct itimerval ival;          /* maintenance interval */
        !           244: extern struct zoneinfo *zones;         /* zone information */
        !           245: extern int nzones;                     /* number of zones in use */
        !           246: 
        !           247: extern int forward_only;               /* true on slave server */
        !           248: #endif /* XFER */
        !           249: 
        !           250: #ifdef vax
        !           251: extern u_short htons(), ntohs();
        !           252: extern u_long htonl(), ntohl();
        !           253: #endif
        !           254: 
        !           255: #define MAX_XFER_TIME         60 * 60 * 2  /* max seconds for an xfer */
        !           256: #define XFER_TIME_FUDGE              10           /* MAX_XFER_TIME fudge */
        !           257: 
        !           258: #ifndef XFER
        !           259: extern int xfer_running_cnt;             /* number of xfers running */
        !           260: extern int xfer_deferred_cnt;            /* number of deferred xfers */
        !           261: #define MAX_XFERS_RUNNING     4           /* max value of xfer_running_cnt */
        !           262: #endif /* XFER */

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