X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Finternal.h;h=f1f4d9650da70328c9b5c515d55c8b9e797b0594;hp=b121c9f7e0f1cb22ef2d1b43e26e0200cb15e992;hb=7da210700fbdd45a273d6735f6a2a55ae3838633;hpb=8e5b0abb4e5416f4bd244500d9ba8dd45788093e

diff --git a/src/internal.h b/src/internal.h
index b121c9f..f1f4d96 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -1,4 +1,26 @@
-/**/
+/*
+ * internal.h
+ * - declarations of private objects with external linkage (adns__*)
+ * - definitons of internal macros
+ * - comments regarding library data structures
+ */
+/*
+ *  This file is part of adns, which is Copyright (C) 1997, 1998 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
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *  
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software Foundation,
+ *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
+ */
 
 #ifndef ADNS_INTERNAL_H_INCLUDED
 #define ADNS_INTERNAL_H_INCLUDED
@@ -55,16 +77,36 @@ typedef struct {
 
 typedef union {
   void *ext;
-  int dmaddr_index;
+  adns_rr_hostaddr *hostaddr;
 } qcontext;
 
+typedef struct {
+  adns_state ads;
+  adns_query qu;
+  int serv;
+  const byte *dgram;
+  int dglen, nsstart, nscount, arcount;
+  struct timeval now;
+} parseinfo;
+
 typedef struct {
   adns_rrtype type;
+  const char *rrtname;
+  const char *fmtname;
   int rrsz;
 
-  adns_status (*parse)(adns_state ads, adns_query qu, int serv,
-		       const byte *dgram, int dglen, int cbyte, int max,
-		       void *store_r);
+  void (*makefinal)(adns_query qu, void *data);
+  /* Change memory management of *data.
+   * Previously, used alloc_interim, now use alloc_final.
+   */
+
+  adns_status (*convstring)(vbuf *vb, const void *data);
+  /* Converts the RR data to a string representation in vbuf.
+   * vbuf will be appended to (it must have been initialised),
+   * and will not be null-terminated by convstring.
+   */
+
+  adns_status (*parse)(const parseinfo *pai, int cbyte, int max, void *store_r);
   /* Parse one RR, in dgram of length dglen, starting at cbyte and
    * extending until at most max.
    *
@@ -72,11 +114,13 @@ typedef struct {
    *
    * If there is an overrun which might indicate truncation, it should set
    * *rdstart to -1; otherwise it may set it to anything else positive.
+   *
+   * nsstart is the offset of the authority section.
    */
 
-  void (*makefinal)(adns_state ads, adns_query qu, void *data);
-  /* Change memory management of *data.
-   * Previously, used alloc_interim, now use alloc_final.
+  int (*diff_needswap)(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.
    */
 } typeinfo;
 
@@ -94,15 +138,17 @@ union maxalign {
 } data;
 
 struct adns__query {
+  adns_state ads;
   enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
   adns_query back, next, parent;
   struct { adns_query head, tail; } children;
   struct { adns_query back, next; } siblings;
   struct allocnode *allocations;
-  int interim_alloced, final_used;
+  int interim_allocd;
+  void *final_allocspace;
   
   const typeinfo *typei;
-  char *query_dgram;
+  byte *query_dgram;
   int query_dglen;
   
   vbuf vb;
@@ -122,6 +168,7 @@ struct adns__query {
   
   byte *cname_dgram;
   int cname_dglen, cname_begin;
+  /* If non-0, has been allocated using . */
   
   int id, flags, udpretries;
   int udpnextserver;
@@ -198,43 +245,100 @@ struct adns__state {
 
 /* From setup.c: */
 
+int adns__setnonblock(adns_state ads, int fd); /* => errno value */
+
+/* From general.c: */
+
 void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
-		 int serv, const char *fmt, va_list al);
+		 int serv, adns_query qu, const char *fmt, va_list al);
 
 void adns__debug(adns_state ads, int serv, adns_query qu,
-		 const char *fmt, ...) PRINTFFORMAT(3,4);
+		 const char *fmt, ...) PRINTFFORMAT(4,5);
 void adns__warn(adns_state ads, int serv, adns_query qu,
-		const char *fmt, ...) PRINTFFORMAT(3,4);
+		const char *fmt, ...) PRINTFFORMAT(4,5);
 void adns__diag(adns_state ads, int serv, adns_query qu,
-		const char *fmt, ...) PRINTFFORMAT(3,4);
+		const char *fmt, ...) PRINTFFORMAT(4,5);
 
 int adns__vbuf_ensure(vbuf *vb, int want);
-int adns__vbuf_appendstr(vbuf *vb, const char *data);
+int adns__vbuf_appendstr(vbuf *vb, const char *data); /* does not include nul */
 int adns__vbuf_append(vbuf *vb, const byte *data, int len);
 /* 1=>success, 0=>realloc failed */
 void adns__vbuf_appendq(vbuf *vb, const byte *data, int len);
 void adns__vbuf_init(vbuf *vb);
 void adns__vbuf_free(vbuf *vb);
 
-int adns__setnonblock(adns_state ads, int fd); /* => errno value */
+const char *adns__diag_domain(adns_state ads, int serv, adns_query qu,
+			      vbuf *vb, const byte *dgram, int dglen, int cbyte);
+/* Unpicks a domain in a datagram and returns a string suitable for
+ * printing it as.  Never fails - if an error occurs, it will
+ * return some kind of string describing the error.
+ *
+ * serv may be -1 and qu may be 0.  vb must have been initialised,
+ * and will be left in an arbitrary consistent state.
+ *
+ * Returns either vb->buf, or a pointer to a string literal.  Do not modify
+ * vb before using the return value.
+ */
+  
+void adns__isort(void *array, int nobjs, int sz, void *tempbuf,
+		 int (*needswap)(const void *a, const void *b));
+/* 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
+ * wrong order) 0 if a<=b (ie, order is fine).
+ */
+  
+/* From transmit.c: */
+
+adns_status adns__mkquery(adns_state ads, vbuf *vb, int *id_r,
+			  const char *owner, int ol,
+			  const typeinfo *typei, adns_queryflags flags);
+/* Assembles a query packet in vb, and returns id at *id_r. */
 
-/* From submit.c: */
+adns_status adns__mkquery_frdgram(adns_state ads, vbuf *vb, int *id_r,
+				  const byte *qd_dgram, int qd_dglen, int qd_begin,
+				  adns_rrtype type, adns_queryflags flags);
+/* Same as adns__mkquery, but takes the owner domain from an existing datagram.
+ * That domain must be correct and untruncated.
+ */
+
+void adns__query_tcp(adns_query qu, struct timeval now);
+/* Query must be in state tcpwait/timew; it will be moved to a new state
+ * if possible and no further processing can be done on it for now.
+ * (Resulting state is one of tcpwait/timew (if server not connected),
+ *  tcpsent/timew, child/childw or done/output.)
+ *
+ * adns__tcp_tryconnect should already have been called - _tcp
+ * will only use an existing connection (if there is one), which it
+ * may break.  If the conn list lost then the caller is responsible for any
+ * reestablishment and retry.
+ */
+
+void adns__query_udp(adns_query qu, struct timeval now);
+/* Query must be in state udp/NONE; it will be moved to a new state,
+ * and no further processing can be done on it for now.
+ * (Resulting state is one of udp/timew, tcpwait/timew (if server not connected),
+ *  tcpsent/timew, child/childw or done/output.)
+ */
+
+/* From query.c: */
 
 int adns__internal_submit(adns_state ads, adns_query *query_r,
-			  adns_rrtype type, char *query_dgram, int query_len,
+			  const typeinfo *typei, vbuf *qumsg_vb, int id,
 			  adns_queryflags flags, struct timeval now,
 			  adns_status failstat, const qcontext *ctx);
 /* Submits a query (for internal use, called during external submits).
  *
  * The new query is returned in *query_r, or we return adns_s_nomemory.
  *
- * The query datagram should already have been assembled; memory for it
- * is taken over by this routine whether it succeeds or fails.
+ * The query datagram should already have been assembled in qumsg_vb;
+ * the memory for it is _taken over_ by this routine whether it
+ * succeeds or fails (if it succeeds, the vbuf is reused for qu->vb).
  *
  * If failstat is nonzero then if we are successful in creating the query
  * it is immediately failed with code failstat (but _submit still succeds).
  *
- * ctx is copied byte-for-byte into the query.
+ * *ctx is copied byte-for-byte into the query.
  */
 
 void *adns__alloc_interim(adns_query qu, size_t sz);
@@ -247,24 +351,37 @@ void *adns__alloc_interim(adns_query qu, size_t sz);
  * big enough for all these allocations, and then adns__alloc_final
  * will get memory from this buffer.
  *
- * _alloc_interim can fail, in which case it will fail the query too,
- * so nothing more need be done with it.
+ * _alloc_interim can fail (and return 0).
+ * The caller must ensure that the query is failed.
+ *
+ * adns__alloc_interim_{only,fail}(qu,0) will not return 0,
+ * but it will not necessarily return a distinct pointer each time.
  */
 
-void *adns__alloc_final(adns_query qu, size_t sz);
-/* Cannot fail.
+void *adns__alloc_mine(adns_query qu, size_t sz);
+/* Like _interim, but does not record the length for later
+ * copying into the answer.  This just ensures that the memory
+ * will be freed when we're done with the query.
  */
 
-/* From query.c: */
+void *adns__alloc_final(adns_query qu, size_t sz);
+/* Cannot fail, and cannot return 0.
+ */
 
-void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
-void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
-adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
-			  const typeinfo *typei, adns_queryflags flags);
+void adns__makefinal_block(adns_query qu, void **blpp, size_t sz);
+void adns__makefinal_str(adns_query qu, char **strp);
 
-void adns__query_ok(adns_state ads, adns_query qu);
-void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
+void adns__reset_cnameonly(adns_query qu);
+/* Resets all of the memory management stuff etc. to
+ * take account of only the CNAME.  Used when we find an error somewhere
+ * and want to just report the error (with perhaps CNAME info), and also
+ * when we're halfway through RRs in a datagram and discover that we
+ * need to retry the query.
+ */
 
+void adns__query_done(adns_query qu);
+void adns__query_fail(adns_query qu, adns_status stat);
+   
 /* From reply.c: */
 
 void adns__procdgram(adns_state ads, const byte *dgram, int len,
@@ -277,24 +394,26 @@ const typeinfo *adns__findtype(adns_rrtype type);
 /* From parse.c: */
 
 typedef struct {
-  adns_state ads, int serv;
+  adns_state ads;
+  adns_query qu;
+  int serv;
   const byte *dgram;
   int dglen, max, cbyte, namelen;
-  int *dmend_rlater, *namelen_rlater;
+  int *dmend_r;
 } findlabel_state;
 
-void adns__findlabel_start(findlabel_state *fls,
-			   adns_state ads, int serv,
+void adns__findlabel_start(findlabel_state *fls, adns_state ads,
+			   int serv, adns_query qu,
 			   const byte *dgram, int dglen, int max,
 			   int dmbegin, int *dmend_rlater);
 /* Finds labels in a domain in a datagram.
  *
  * Call this routine first.
- * endpoint_rlater may be null.
+ * dmend_rlater may be null.  ads (and of course fls) may not be.
+ * serv may be -1, qu may be null - they are for error reporting.
  */
 
-adns_status adns__findlabel_next(findlabel_state *fls,
-				 int *lablen_r, int *labstart_r);
+adns_status adns__findlabel_next(findlabel_state *fls, int *lablen_r, int *labstart_r);
 /* Then, call this one repeatedly.
  *
  * It will return adns_s_ok if all is well, and tell you the length
@@ -319,45 +438,67 @@ adns_status adns__findlabel_next(findlabel_state *fls,
  * Do not then call findlabel_next again.
  */
 
-adns_status adns__parse_domain(adns_state ads, int serv, vbuf *vb,
-			       const byte *dgram, int dglen,
-			       int *cbyte_io, int max);
+typedef enum {
+  pdf_quoteok= 0x001
+} parsedomain_flags;
+
+adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu,
+			       vbuf *vb, parsedomain_flags flags,
+			       const byte *dgram, int dglen, int *cbyte_io, int max);
 /* vb must already have been initialised; it will be reset if necessary.
  * If there is truncation, vb->used will be set to 0; otherwise
  * (if there is no error) vb will be null-terminated.
  * If there is an error vb and *cbyte_io may be left indeterminate.
+ *
+ * serv may be -1 and qu may be 0 - they are used for error reporting only.
  */
 
-adns_status adns__findrr(adns_state ads, int serv,
+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,
-			 const byte *eo_dgram, int eo_dglen, int eo_cbyte,
-			 int *eo_matched_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.
-   *
-   * If the caller thinks they know what the owner of the RR ought to
-   * be they can pass in details in eo_*: this is another (or perhaps
-   * the same datagram), and a pointer to where the putative owner
-   * starts in that datagram.  In this case *eo_matched_r will be set
-   * to 1 if the datagram matched or 0 if it did not.  Either
-   * both eo_dgram and eo_matched_r must both be non-null, or they
-   * must both be null (in which case eo_dglen and eo_cbyte will be ignored).
-   * The eo datagram and contained owner domain MUST be valid and
-   * untruncated.
-   *
-   * If there is truncation then *type_r will be set to -1 and
-   * *cbyte_io, *class_r, *rdlen_r, *rdstart_r and *eo_matched_r will be
-   * undefined.
-   *
-   * If an error is returned then *type_r will be undefined too.
-   */
+			 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.
+ *
+ * If ownermatchedquery_r != 0 then the owner domain of this
+ * RR will be compared with that in the query (or, if the query
+ * has gone to a CNAME lookup, with the canonical name).
+ * In this case, *ownermatchedquery_r will be set to 0 or 1.
+ * The query datagram (or CNAME datagram) MUST be valid and not truncated.
+ *
+ * If there is truncation then *type_r will be set to -1 and
+ * *cbyte_io, *class_r, *rdlen_r, *rdstart_r and *eo_matched_r will be
+ * undefined.
+ *
+ * qu must obviously be non-null.
+ *
+ * If an error is returned then *type_r will be undefined too.
+ */
+
+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,
+				const byte *eo_dgram, int eo_dglen, int eo_cbyte,
+				int *eo_matched_r);
+/* Like adns__findrr_checked, except that the datagram and
+ * owner to compare with can be specified explicitly.
+ *
+ * If the caller thinks they know what the owner of the RR ought to
+ * be they can pass in details in eo_*: this is another (or perhaps
+ * the same datagram), and a pointer to where the putative owner
+ * starts in that datagram.  In this case *eo_matched_r will be set
+ * to 1 if the datagram matched or 0 if it did not.  Either
+ * both eo_dgram and eo_matched_r must both be non-null, or they
+ * must both be null (in which case eo_dglen and eo_cbyte will be ignored).
+ * The eo datagram and contained owner domain MUST be valid and
+ * untruncated.
+ */
 
 int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len);
 
@@ -365,7 +506,9 @@ int vbuf__append_quoted1035(vbuf *vb, const byte *buf, int len);
 
 void adns__tcp_broken(adns_state ads, const char *what, const char *why);
 void adns__tcp_tryconnect(adns_state ads, struct timeval now);
+
 void adns__autosys(adns_state ads, struct timeval now);
+/* Make all the system calls we want to if the application wants us to. */
 
 /* Useful static inline functions: */
 
@@ -403,16 +546,16 @@ static inline int ctype_alpha(int c) {
 
 #define LIST_LINK_TAIL_PART(list,node,part) \
   do { \
-    (node)->part back= 0; \
-    (node)->part next= (list).tail; \
-    if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
+    (node)->part next= 0; \
+    (node)->part back= (list).tail; \
+    if ((list).tail) (list).tail->part next= (node); else (list).head= (node); \
     (list).tail= (node); \
   } while(0)
 
 #define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
 #define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)
 
-#define GETIL_B(cb) (dgram[(cb)++])
+#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))