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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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