X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/adns/blobdiff_plain/36369543b62cd8922a096f7877036ec8497bc5a9..73dba56e1981d7fe721acf17d0cd91a4fed04850:/src/internal.h

diff --git a/src/internal.h b/src/internal.h
index 27d0258..5e59a12 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -5,7 +5,7 @@
  * - comments regarding library data structures
  */
 /*
- *  This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
+ *  This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
  *  
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -25,7 +25,7 @@
 #ifndef ADNS_INTERNAL_H_INCLUDED
 #define ADNS_INTERNAL_H_INCLUDED
 
-#define PRINTFFORMAT(a,b) __attribute__((format(printf,a,b)))
+#include "config.h"
 typedef unsigned char byte;
 
 #include <stdarg.h>
@@ -39,10 +39,12 @@ typedef unsigned char byte;
 /* Configuration and constants */
 
 #define MAXSERVERS 5
-#define UDPMAXRETRIES /*15*/5
+#define MAXSORTLIST 15
+#define UDPMAXRETRIES 15
 #define UDPRETRYMS 2000
 #define TCPMS 30000
 #define LOCALRESOURCEMS 20
+#define MAXTTLBELIEVE (7*86400) /* any TTL > 7 days is capped */
 
 #define DNS_PORT 53
 #define DNS_MAXUDP 512
@@ -115,7 +117,7 @@ typedef struct {
    * nsstart is the offset of the authority section.
    */
 
-  int (*diff_needswap)(const void *datap_a, const void *datap_b);
+  int (*diff_needswap)(adns_state ads, const void *datap_a, const void *datap_b);
   /* Returns !0 if RR a should be strictly after RR b in the sort order,
    * 0 otherwise.  Must not fail.
    */
@@ -180,6 +182,7 @@ struct adns__query {
   int udpnextserver;
   unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
   struct timeval timeout;
+  time_t expires; /* Earliest expiry time of any record we used. */
 
   qcontext ctx;
 
@@ -243,12 +246,15 @@ struct adns__state {
   struct { adns_query head, tail; } timew, childw, output;
   int nextid, udpsocket, tcpsocket;
   vbuf tcpsend, tcprecv;
-  int nservers, tcpserver;
+  int nservers, nsortlist, tcpserver;
   enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
   struct timeval tcptimeout;
   struct server {
     struct in_addr addr;
   } servers[MAXSERVERS];
+  struct sortlist {
+    struct in_addr base, mask;
+  } sortlist[MAXSORTLIST];
 };
 
 /* From setup.c: */
@@ -289,7 +295,8 @@ const char *adns__diag_domain(adns_state ads, int serv, adns_query qu,
  */
   
 void adns__isort(void *array, int nobjs, int sz, void *tempbuf,
-		 int (*needswap)(const void *a, const void *b));
+		 int (*needswap)(void *context, const void *a, const void *b),
+		 void *context);
 /* Does an insertion sort of array which must contain nobjs objects
  * each sz bytes long.  tempbuf must point to a buffer at least
  * sz bytes long.  needswap should return !0 if a>b (strictly, ie
@@ -374,6 +381,10 @@ void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t
  *
  * It is legal to call adns__transfer_interim with a null pointer; this
  * has no effect.
+ *
+ * _transfer_interim also ensures that the expiry time of the `to' query
+ * is no later than that of the `from' query, so that child queries'
+ * TTLs get inherited by their parents.
  */
 
 void *adns__alloc_mine(adns_query qu, size_t sz);
@@ -473,16 +484,17 @@ adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu,
 
 adns_status adns__findrr(adns_query qu, int serv,
 			 const byte *dgram, int dglen, int *cbyte_io,
-			 int *type_r, int *class_r, int *rdlen_r, int *rdstart_r,
+			 int *type_r, int *class_r, unsigned long *ttl_r,
+			 int *rdlen_r, int *rdstart_r,
 			 int *ownermatchedquery_r);
 /* Finds the extent and some of the contents of an RR in a datagram
  * and does some checks.  The datagram is *dgram, length dglen, and
  * the RR starts at *cbyte_io (which is updated afterwards to point
  * to the end of the RR).
  *
- * The type, class and RRdata length and start are returned iff
- * the corresponding pointer variables are not null.  type_r and
- * class_r may not be null.
+ * The type, class, TTL and RRdata length and start are returned iff
+ * the corresponding pointer variables are not null.  type_r, class_r
+ * and ttl_r may not be null.  The TTL will be capped.
  *
  * If ownermatchedquery_r != 0 then the owner domain of this
  * RR will be compared with that in the query (or, if the query
@@ -501,7 +513,8 @@ adns_status adns__findrr(adns_query qu, int serv,
 
 adns_status adns__findrr_anychk(adns_query qu, int serv,
 				const byte *dgram, int dglen, int *cbyte_io,
-				int *type_r, int *class_r, int *rdlen_r, int *rdstart_r,
+				int *type_r, int *class_r, unsigned long *ttl_r,
+				int *rdlen_r, int *rdstart_r,
 				const byte *eo_dgram, int eo_dglen, int eo_cbyte,
 				int *eo_matched_r);
 /* Like adns__findrr_checked, except that the datagram and
@@ -518,6 +531,11 @@ adns_status adns__findrr_anychk(adns_query qu, int serv,
  * untruncated.
  */
 
+void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now);
+/* Updates the `expires' field in the query, so that it doesn't exceed
+ * now + ttl.
+ */
+
 int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len);
 
 /* From event.c: */
@@ -576,5 +594,11 @@ static inline int ctype_alpha(int c) {
 #define GETIL_B(cb) (((dgram)[(cb)++]) & 0x0ff)
 #define GET_B(cb,tv) ((tv)= GETIL_B((cb)))
 #define GET_W(cb,tv) ((tv)=0, (tv)|=(GETIL_B((cb))<<8), (tv)|=GETIL_B(cb), (tv))
+#define GET_L(cb,tv) ( (tv)=0, \
+		       (tv)|=(GETIL_B((cb))<<24), \
+		       (tv)|=(GETIL_B((cb))<<16), \
+		       (tv)|=(GETIL_B((cb))<<8), \
+		       (tv)|=GETIL_B(cb), \
+		       (tv) )
 
 #endif