Some more fiddlings.

[adns.git] / src / adns.h

diff --git a/src/adns.h b/src/adns.h
index 61b3fc8138d3c33fa2bc096420d3896c811d8a4d..ae0a7425dbf87b01e86c214f0927ff9fae52f82c 100644 (file)
--- a/src/adns.h
+++ b/src/adns.h
@@ -3,78 +3,103 @@
 #ifndef ADNS_H_INCLUDED
 #define ADNS_H_INCLUDED
 
 #ifndef ADNS_H_INCLUDED
 #define ADNS_H_INCLUDED
 

-typedef struct adns__state adns_state;
-typedef struct adns__query adns_query;
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+typedef struct adns__state *adns_state;
+typedef struct adns__query *adns_query;

 
 typedef enum {
 
 typedef enum {

-  adns_if_noenv=      0x0001, /* do not look at environment */
-  adns_if_noerrprint= 0x0002, /* never print output to stderr */
-  adns_if_debug=      0x0004, /* print debugging output to stderr */
+  adns_if_noenv=        0x0001, /* do not look at environment */
+  adns_if_noerrprint=   0x0002, /* never print output to stderr (_debug overrides) */
+  adns_if_noserverwarn= 0x0004, /* do not warn to stderr about duff nameservers etc */
+  adns_if_debug=        0x0008, /* enable all output to stderr plus debug msgs*/
+  adns_if_noautosys=    0x0010, /* do not make syscalls at every opportunity */

 } adns_initflags;
 
 typedef enum {
   adns_f_search=     0x0001, /* use the searchlist */
   adns_f_usevc=      0x0002, /* use a virtual circuit (TCP connection) */
 } adns_initflags;
 
 typedef enum {
   adns_f_search=     0x0001, /* use the searchlist */
   adns_f_usevc=      0x0002, /* use a virtual circuit (TCP connection) */

+  adns_f_anyquote=   0x0004,

 } adns_queryflags;
 
 typedef enum {
 } adns_queryflags;
 
 typedef enum {

-  adns_rrttype_mask=  0x0fff,
-  adns_qtf_deref=     0x1000,
-  adns_qtf_mailconv=  0x2000,
-  adns_r_none=             0,
-  adns_r_a=                1,
-  adns_r_ns_raw=           2,
-  adns_r_ns=                  adns_r_ns_raw|adns_qtf_deref,
-  adns_r_cname=            5,
-  adns_r_soa_raw=          6,
-  adns_r_soa=                 adns_r_soa_raw|adns_qtf_mailconv,
-  adns_r_null=            10,
-  adns_r_ptr_raw=         12,
-  adns_r_ptr=                 adns_r_ptr_raw|adns_rf_deref,
-  adns_r_hinfo=           13,  
-  adns_r_mx_raw=          15,
-  adns_r_mx=                  adns_r_mx_raw|adns_qtf_deref,
-  adns_r_txt=             16,
-  adns_r_rp_raw           17,
-  adns_r_rp=                  adns_r_rp_raw|adns_qtf_mailconv
+  adns__rrt_typemask=  0x0ffff,
+  adns__qtf_deref=     0x10000, /* dereference domains and produce extra data */
+  adns__qtf_mailconv=  0x20000, /* put @ between first and second labels */
+  adns_r_none=               0,
+  adns_r_a=                  1,
+  adns_r_ns_raw=             2,
+  adns_r_ns=                    adns_r_ns_raw|adns__qtf_deref,
+  adns_r_cname=              5,
+  adns_r_soa_raw=            6,
+  adns_r_soa=                   adns_r_soa_raw|adns__qtf_mailconv,
+  adns_r_null=              10,
+  adns_r_ptr_raw=           12,
+  adns_r_ptr=                   adns_r_ptr_raw|adns__qtf_deref,
+  adns_r_hinfo=             13,  
+  adns_r_mx_raw=            15,
+  adns_r_mx=                    adns_r_mx_raw|adns__qtf_deref,
+  adns_r_txt=               16,
+  adns_r_rp_raw=            17,
+  adns_r_rp=                    adns_r_rp_raw|adns__qtf_mailconv

 } adns_rrtype;
 
 } adns_rrtype;
 

+/* In queries without qtf_anyquote, all domains must have standard
+ * legal syntax.  In queries _with_ qtf_anyquote, domains in the query
+ * or response may contain any characters, quoted according to
+ * RFC1035 5.1.  On input to adns, the char* is a pointer to the
+ * interior of a " delimited string, except that " may appear in it,
+ * and on output, the char* is a pointer to a string which would be
+ * legal either inside or outside " delimiters, and any characters
+ * not usually legal in domain names will be quoted as \X
+ * (if the character is 33-126 except \ and ") or \DDD.
+ *
+ * Do not ask for records containing mailboxes without
+ * specifying qtf_mailconv or qtf_anyquote.
+ */
+

 typedef enum {
   adns_s_ok,
 typedef enum {
   adns_s_ok,

-  adns_s_notresponding,
-  adns_s_serverfailure,
+  adns_s_timeout,

   adns_s_unknownqtype,
   adns_s_unknownqtype,

-  adns_s_remoteerror,
+  adns_s_nolocalmem,
+  adns_s_connlost,

   adns_s_max_tempfail= 99,
   adns_s_max_tempfail= 99,

+  adns_s_inconsistent, /* PTR gives domain whose A does not match */
+  adns_s_badcname, /* CNAME found where actual record expected */
+  adns_s_max_misconfig= 199;

   adns_s_nxdomain,
   adns_s_norecord,
   adns_s_invaliddomain
 } adns_status;
 
   adns_s_nxdomain,
   adns_s_norecord,
   adns_s_invaliddomain
 } adns_status;
 

-/* In dereferenced answers, multiple addresses show up as multiple
- * answers with all the dm pointers being the same.  If no
- * address is available (permanent failure) then INADDR_NONE is
- * used. */
+typedef struct {
+  char *dm;
+  adns_status astatus;
+  int naddrs; /* temp fail => -1, perm fail => 0, s_ok => >0 */
+  struct in_addr *addrs;
+} adns_dmaddr;

 
 

-struct adns_answer {
+typedef struct {

   adns_status status;
   char *cname; /* always NULL if query was for CNAME records */
   adns_rrtype type;
   int nrrs;
   union {
   adns_status status;
   char *cname; /* always NULL if query was for CNAME records */
   adns_rrtype type;
   int nrrs;
   union {

-    struct in_addr inaddr[1];                                          /* a */
-    char (*str)[1];                     /* ns_raw, cname, ptr, ptr_raw, txt */
-    struct { char *dm; struct in_addr addr; } dmaddr;                 /* ns */
-    struct { char *a, *b; } strpair[1];                /* hinfo, rp, rp_raw */
-    struct { int pref; char *dm; struct in_addr addr; } intdmaddr[1]; /* mx */
-    struct { int pref; char *str; } intstr[1]; /* mx_raw */
+    struct in_addr inaddr[1];                                                    /* a */
+    char (*str)[1];                               /* ns_raw, cname, ptr, ptr_raw, txt */
+    adns_dmaddr dmaddr[1];                                                      /* ns */
+    struct { char *a, *b; } strpair[1];                          /* hinfo, rp, rp_raw */
+    struct { int pref; adns_dmaddrs dmaddr; } intdmaddr[1];                     /* mx */
+    struct { int pref; char *str; } intstr[1];                              /* mx_raw */

     struct {
       char *ns0, *rp;
       unsigned long serial, refresh, retry, expire, minimum;
     struct {
       char *ns0, *rp;
       unsigned long serial, refresh, retry, expire, minimum;

-    } soa[1]; /* soa, soa_raw */
+    } soa[1];                                                         /* soa, soa_raw */

     /* NULL is empty */
   } rrs;
     /* NULL is empty */
   } rrs;

-};
+} adns_answer;

 
 /* Memory management:
  *  adns_state and adns_query are actually pointers to malloc'd state;
 
 /* Memory management:
  *  adns_state and adns_query are actually pointers to malloc'd state;


@@ -92,47 +117,69 @@ struct adns_answer {
  *  are returned in the status field of the answer.  If status is
  *  nonzero then nrrs will be 0, otherwise it will be >0.
  *  type will always be the type requested;
  *  are returned in the status field of the answer.  If status is
  *  nonzero then nrrs will be 0, otherwise it will be >0.
  *  type will always be the type requested;

- *  If no (appropriate) requests are done adns_query returns EWOULDBLOCK;
- *  If no requests are outstanding adns_query and adns_wait return ESRCH;
+ *  If no (appropriate) requests are done adns_check returns EWOULDBLOCK;
+ *  If no (appropriate) requests are outstanding adns_query and adns_wait return ESRCH;

  *  If malloc failure occurs during internal allocation or processing
  *  If malloc failure occurs during internal allocation or processing

- *  ands_query, _wait and _answer set *answer to 0.
+ *  ands_check and _wait set *answer to 0.

  */
 
  */
 

-int adns_init(adns_state *newstate_r);
+int adns_init(adns_state *newstate_r, adns_initflags flags, FILE *diagfile/*0=>stderr*/);

 
 int adns_synchronous(adns_state ads,
                     const char *owner,
                     adns_rrtype type,
 
 int adns_synchronous(adns_state ads,
                     const char *owner,
                     adns_rrtype type,

-                    int flags,
-                    struct adns_answer *answer);
+                    adns_queryflags flags,
+                    adns_answer **answer_r);
+/* Will not return EINTR. */
+
+/* NB: if you set adns_if_noautosys then _submit and _check do not
+ * make any system calls; you must use adns_callback (possibly after
+ * adns_interest) to actually get things to happen.
+ */

 
 int adns_submit(adns_state ads,
                const char *owner,
                adns_rrtype type,
 
 int adns_submit(adns_state ads,
                const char *owner,
                adns_rrtype type,

-               int flags,
+               adns_queryflags flags,

                void *context,
                void *context,

-               const struct adns_query *query_r);
+               adns_query *query_r);

 
 

-int adns_query(adns_state ads,
+int adns_check(adns_state ads,

               adns_query *query_io,
               adns_query *query_io,

-              struct adns_answer *answer,
-              void *context_r);
+              adns_answer **answer_r,
+              void **context_r);

 
 int adns_wait(adns_state ads,
              adns_query *query_io,
 
 int adns_wait(adns_state ads,
              adns_query *query_io,

-             struct adns_answer *answer,
-              void *context_r);
+             adns_answer **answer_r,
+             void **context_r);
+/* Might return EINTR - if so, try again */

 
 

-int adns_cancel(adns_state ads, adns_query query);
+void adns_cancel(adns_state ads, adns_query query);

 
 int adns_finish(adns_state);
 
 
 int adns_finish(adns_state);
 

-void adns_event(adns_state, fd_set *readfds_mod,
-               fd_set *writefds_mod, fd_set *exceptfds_mod,
-               int *maxfd_mod, struct timeval *tv_mod);
-/* You may call this with *_mod=0 to have a simple callback,
-   or with *fds_mod=*maxfd_mod=0 but tv_mod!=0 if you are
-   not going to sleep, or with all !=0 if you are going to sleep. */
+int adns_callback(adns_state, int maxfd, const fd_set *readfds, const fd_set *writefds,
+                 const fd_set *exceptfds);
+/* Gives adns flow-of-control for a bit.  This will never block.
+ * If maxfd == -1 then adns will check (make nonblocking system calls on)
+ * all of its own filedescriptors; otherwise it will only use those
+ * < maxfd and specified in the fd_set's, as if select had returned them.
+ * Other fd's may be in the fd_sets, and will be ignored.
+ * _callback returns how many adns fd's were in the various sets, so
+ * you can tell if your select handling code has missed something and is going awol.
+ */
+
+void adns_interest(adns_state, int *maxfd_io, fd_set *readfds_io,
+                  fd_set *writefds_io, fd_set *exceptfds_io,
+                  struct timeval **tv_mod, struct timeval *tv_buf);
+/* Find out file descriptors adns is interested in, and when it
+ * would like the opportunity to time something out.  If you do not plan to
+ * block then tv_mod may be 0.  Otherwise, tv_mod may point to 0 meaning
+ * you have no timeout of your own, in which case tv_buf must be non-null and
+ * _interest may fill it in and set *tv_mod=tv_buf.
+ * readfds, writefds, exceptfds and maxfd may not be 0.
+ */

 
 /* Example expected/legal calling sequences:
  *  adns_init
 
 /* Example expected/legal calling sequences:
  *  adns_init


@@ -140,20 +187,20 @@ void adns_event(adns_state, fd_set *readfds_mod,
  *  adns_submit 2
  *  adns_submit 3
  *  adns_wait 1
  *  adns_submit 2
  *  adns_submit 3
  *  adns_wait 1

- *  adns_query 3 -> EWOULDBLOCK
+ *  adns_check 3 -> EWOULDBLOCK

  *  adns_wait 2
  *  adns_wait 3
  *  ....
  *  adns_finish
  *
  *  adns_wait 2
  *  adns_wait 3
  *  ....
  *  adns_finish
  *

- *  adns_init
- *  adns_submit ...
+ *  adns_init _noautosys

  *  loop {
  *  loop {

- *   adns_query

  *   adns_interest
  *   select
  *   adns_callback
  *   adns_interest
  *   select
  *   adns_callback

- *   other things
+ *   ...
+ *   adns_submit / adns_check
+ *   ...

  *  }
  */
 
  *  }
  */