X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/adns/blobdiff_plain/a719a4bedec2bc512b7f95f7446e02f6662ebbc7..ac868fa87da18cdebb86103b35ce250bd171f700:/src/internal.h

diff --git a/src/internal.h b/src/internal.h
index f0f9147..9a5f23d 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -31,6 +31,7 @@ typedef unsigned char byte;
 #include <stdarg.h>
 #include <assert.h>
 #include <unistd.h>
+#include <signal.h>
 
 #include <sys/time.h>
 
@@ -44,6 +45,7 @@ typedef unsigned char byte;
 #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
@@ -181,6 +183,7 @@ 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;
 
@@ -247,6 +250,8 @@ struct adns__state {
   int nservers, nsortlist, tcpserver;
   enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
   struct timeval tcptimeout;
+  struct sigaction stdsigpipe;
+  sigset_t stdsigmask;
   struct server {
     struct in_addr addr;
   } servers[MAXSERVERS];
@@ -300,7 +305,15 @@ void adns__isort(void *array, int nobjs, int sz, void *tempbuf,
  * sz bytes long.  needswap should return !0 if a>b (strictly, ie
  * wrong order) 0 if a<=b (ie, order is fine).
  */
-  
+
+void adns__sigpipe_protect(adns_state);
+void adns__sigpipe_unprotect(adns_state);
+/* If SIGPIPE protection is not disabled, will block all signals except
+ * SIGPIPE, and set SIGPIPE's disposition to SIG_IGN.  (And then restore.)
+ * Each call to _protect must be followed by a call to _unprotect before
+ * any significant amount of code gets to run.
+ */
+
 /* From transmit.c: */
 
 adns_status adns__mkquery(adns_state ads, vbuf *vb, int *id_r,
@@ -379,6 +392,10 @@ 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);
@@ -476,18 +493,28 @@ adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu,
  * serv may be -1 and qu may be 0 - they are used for error reporting only.
  */
 
+adns_status adns__parse_domain_more(findlabel_state *fls, adns_state ads,
+				    adns_query qu, vbuf *vb, parsedomain_flags flags,
+				    const byte *dgram);
+/* Like adns__parse_domain, but you pass it a pre-initialised findlabel_state,
+ * for continuing an existing domain or some such of some kind.  Also, unlike
+ * _parse_domain, the domain data will be appended to vb, rather than replacing
+ * the existing contents.
+ */
+
 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
@@ -506,7 +533,8 @@ 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
@@ -523,6 +551,11 @@ 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: */
@@ -581,5 +614,11 @@ 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