X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Fquery.c;h=b02abda87fc02e201bd4659a79a48c994f6253a0;hp=9c7fffe52626f853e974ebe11b5298cc3ff8ee08;hb=8b3d55e3d8df616f6fa6d9089a9c9e567229e17b;hpb=8837244370251f16e8f41097d4cbe5ef0058038c

diff --git a/src/query.c b/src/query.c
index 9c7fffe..b02abda 100644
--- a/src/query.c
+++ b/src/query.c
@@ -5,7 +5,7 @@
  * - query submission and cancellation (user-visible and internal)
  */
 /*
- *  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
@@ -27,80 +27,166 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
+#include <string.h>
 
 #include <sys/time.h>
 
 #include "internal.h"
 
-int adns__internal_submit(adns_state ads, adns_query *query_r,
-			  const typeinfo *typei, vbuf *qumsg_vb, int id,
-			  adns_queryflags flags, struct timeval now,
-			  adns_status failstat, const qcontext *ctx) {
+static adns_query query_alloc(adns_state ads, const typeinfo *typei,
+			      adns_queryflags flags, struct timeval now) {
+  /* Allocate a virgin query and return it. */
   adns_query qu;
-
-  qu= malloc(sizeof(*qu)); if (!qu) goto x_nomemory;
-  qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) goto x_freequ_nomemory;
-
+  
+  qu= malloc(sizeof(*qu));  if (!qu) return 0;
+  qu->answer= malloc(sizeof(*qu->answer));  if (!qu->answer) { free(qu); return 0; }
+  
   qu->ads= ads;
   qu->state= query_udp;
   qu->back= qu->next= qu->parent= 0;
   LIST_INIT(qu->children);
-  qu->siblings.next= qu->siblings.back= 0;
-  qu->allocations= 0;
+  LINK_INIT(qu->siblings);
+  LIST_INIT(qu->allocations);
   qu->interim_allocd= 0;
+  qu->preserved_allocd= 0;
   qu->final_allocspace= 0;
 
   qu->typei= typei;
+  qu->query_dgram= 0;
+  qu->query_dglen= 0;
   adns__vbuf_init(&qu->vb);
 
   qu->cname_dgram= 0;
   qu->cname_dglen= qu->cname_begin= 0;
-  
-  qu->id= id;
+
+  adns__vbuf_init(&qu->search_vb);
+  qu->search_origlen= qu->search_pos= qu->search_doneabs= 0;
+
+  qu->id= 0;
   qu->flags= flags;
   qu->udpretries= 0;
   qu->udpnextserver= 0;
   qu->udpsent= qu->tcpfailed= 0;
   timerclear(&qu->timeout);
-  memcpy(&qu->context,ctx,sizeof(qu->context));
+  qu->expires= now.tv_sec + MAXTTLBELIEVE;
+
+  memset(&qu->ctx,0,sizeof(qu->ctx));
 
   qu->answer->status= adns_s_ok;
-  qu->answer->cname= 0;
+  qu->answer->cname= qu->answer->owner= 0;
   qu->answer->type= typei->type;
+  qu->answer->expires= -1;
   qu->answer->nrrs= 0;
-  qu->answer->rrs= 0;
+  qu->answer->rrs.untyped= 0;
   qu->answer->rrsz= typei->rrsz;
-  
-  *query_r= qu;
 
-  qu->query_dglen= qumsg_vb->used;
-  if (qumsg_vb->used) {
-    qu->query_dgram= malloc(qumsg_vb->used);
-    if (!qu->query_dgram) {
-      adns__query_fail(qu,adns_s_nolocalmem);
-      return adns_s_ok;
-    }
-    memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used);
-  } else {
-    qu->query_dgram= 0;
-  }
+  return qu;
+}
+
+static void query_submit(adns_state ads, adns_query qu,
+			 const typeinfo *typei, vbuf *qumsg_vb, int id,
+			 adns_queryflags flags, struct timeval now) {
+  /* Fills in the query message in for a previously-allocated query,
+   * and submits it.  Cannot fail.
+   */
+
   qu->vb= *qumsg_vb;
   adns__vbuf_init(qumsg_vb);
+
+  qu->query_dgram= malloc(qu->vb.used);
+  if (!qu->query_dgram) { adns__query_fail(qu,adns_s_nomemory); return; }
+  
+  qu->id= id;
+  qu->query_dglen= qu->vb.used;
+  memcpy(qu->query_dgram,qu->vb.buf,qu->vb.used);
   
-  if (failstat) {
-    adns__query_fail(qu,failstat);
-    return adns_s_ok;
-  }
   adns__query_udp(qu,now);
   adns__autosys(ads,now);
+}
+
+adns_status adns__internal_submit(adns_state ads, adns_query *query_r,
+				  const typeinfo *typei, vbuf *qumsg_vb, int id,
+				  adns_queryflags flags, struct timeval now,
+				  const qcontext *ctx) {
+  adns_query qu;
 
+  qu= query_alloc(ads,typei,flags,now);
+  if (!qu) { adns__vbuf_free(qumsg_vb); return adns_s_nomemory; }
+  *query_r= qu;
+
+  memcpy(&qu->ctx,ctx,sizeof(qu->ctx));
+  query_submit(ads,qu, typei,qumsg_vb,id,flags,now);
+  
   return adns_s_ok;
+}
 
- x_freequ_nomemory:
-  free(qu);
- x_nomemory:
-  adns__vbuf_free(qumsg_vb);
-  return adns_s_nolocalmem;
+static void query_simple(adns_state ads, adns_query qu,
+			 const char *owner, int ol,
+			 const typeinfo *typei, adns_queryflags flags,
+			 struct timeval now) {
+  vbuf vb;
+  int id;
+  adns_status stat;
+
+  adns__vbuf_init(&vb);
+  
+  stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags);
+  if (stat) { adns__query_fail(qu,stat); return; }
+
+  query_submit(ads,qu, typei,&vb,id, flags,now);
+}
+
+void adns__search_next(adns_state ads, adns_query qu, struct timeval now) {
+  const char *nextentry;
+  adns_status stat;
+  
+  if (qu->search_doneabs<0) {
+    nextentry= 0;
+    qu->search_doneabs= 1;
+  } else {
+    if (qu->search_pos >= ads->nsearchlist) {
+      if (qu->search_doneabs) {
+	stat= adns_s_nxdomain; goto x_fail;
+	return;
+      } else {
+	nextentry= 0;
+	qu->search_doneabs= 1;
+      }
+    } else {
+      nextentry= ads->searchlist[qu->search_pos++];
+    }
+  }
+
+  qu->search_vb.used= qu->search_origlen;
+  if (nextentry) {
+    if (!adns__vbuf_append(&qu->search_vb,".",1) ||
+	!adns__vbuf_appendstr(&qu->search_vb,nextentry)) {
+      stat= adns_s_nomemory; goto x_fail;
+    }
+  }
+
+  free(qu->query_dgram);
+  qu->query_dgram= 0; qu->query_dglen= 0;
+
+  query_simple(ads,qu, qu->search_vb.buf, qu->search_vb.used, qu->typei, qu->flags, now);
+  return;
+  
+x_fail:
+  adns__query_fail(qu,stat);
+}
+
+static int save_owner(adns_query qu, const char *owner, int ol) {
+  /* Returns 1 if OK, otherwise there was no memory. */
+  adns_answer *ans;
+
+  ans= qu->answer;
+  assert(!ans->owner);
+
+  ans->owner= adns__alloc_preserved(qu,ol+1);  if (!ans->owner) return 0;
+
+  memcpy(ans->owner,owner,ol);
+  ans->owner[ol]= 0;
+  return 1;
 }
 
 int adns_submit(adns_state ads,
@@ -109,31 +195,58 @@ int adns_submit(adns_state ads,
 		adns_queryflags flags,
 		void *context,
 		adns_query *query_r) {
-  qcontext ctx;
-  int id, r, ol;
-  vbuf vb;
+  int r, ol, ndots;
   adns_status stat;
   const typeinfo *typei;
   struct timeval now;
+  adns_query qu;
+  const char *p;
 
   typei= adns__findtype(type);
-  if (!typei) return adns_s_notimplemented;
+  if (!typei) return adns_s_unknownrrtype;
+
+  r= gettimeofday(&now,0); if (r) goto x_errno;
+  qu= query_alloc(ads,typei,flags,now); if (!qu) goto x_errno;
   
-  ctx.ext= context;
-  r= gettimeofday(&now,0); if (r) return errno;
-  id= 0;
+  qu->ctx.ext= context;
+  qu->ctx.callback= 0;
+  memset(&qu->ctx.info,0,sizeof(qu->ctx.info));
 
-  adns__vbuf_init(&vb);
+  *query_r= qu;
 
   ol= strlen(owner);
-  if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_domaintoolong; goto xit; }
+  if (!ol) { stat= adns_s_querydomaininvalid; goto x_adnsfail; }
+  if (ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto x_adnsfail; }
 				 
-  if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_qf_search; ol--; }
+  if (ol>=1 && owner[ol-1]=='.' && (ol<2 || owner[ol-2]!='\\')) {
+    flags &= ~adns_qf_search;
+    ol--;
+  }
 
-  stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags);
-			
- xit:
-  return adns__internal_submit(ads,query_r, typei,&vb,id, flags,now, stat,&ctx);	
+  if (flags & adns_qf_search) {
+    r= adns__vbuf_append(&qu->search_vb,owner,ol);
+    if (!r) { stat= adns_s_nomemory; goto x_adnsfail; }
+
+    for (ndots=0, p=owner; (p= strchr(p,'.')); p++, ndots++);
+    qu->search_doneabs= (ndots >= ads->searchndots) ? -1 : 0;
+    qu->search_origlen= ol;
+    adns__search_next(ads,qu,now);
+  } else {
+    if (flags & adns_qf_owner) {
+      if (!save_owner(qu,owner,ol)) { stat= adns_s_nomemory; goto x_adnsfail; }
+    }
+    query_simple(ads,qu, owner,ol, typei,flags, now);
+  }
+  return 0;
+
+ x_adnsfail:
+  adns__query_fail(qu,stat);
+  return 0;
+
+ x_errno:
+  r= errno;
+  assert(r);
+  return r;
 }
 
 int adns_synchronous(adns_state ads,
@@ -160,21 +273,52 @@ static void *alloc_common(adns_query qu, size_t sz) {
   assert(!qu->final_allocspace);
   an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
   if (!an) return 0;
-  an->next= qu->allocations;
-  qu->allocations= an;
+  LIST_LINK_TAIL(qu->allocations,an);
   return (byte*)an + MEM_ROUND(sizeof(*an));
 }
 
 void *adns__alloc_interim(adns_query qu, size_t sz) {
+  void *rv;
+  
   sz= MEM_ROUND(sz);
+  rv= alloc_common(qu,sz);
+  if (!rv) return 0;
   qu->interim_allocd += sz;
-  return alloc_common(qu,sz);
+  return rv;
+}
+
+void *adns__alloc_preserved(adns_query qu, size_t sz) {
+  void *rv;
+  
+  sz= MEM_ROUND(sz);
+  rv= adns__alloc_interim(qu,sz);
+  if (!rv) return 0;
+  qu->preserved_allocd += sz;
+  return rv;
 }
 
 void *adns__alloc_mine(adns_query qu, size_t sz) {
   return alloc_common(qu,MEM_ROUND(sz));
 }
 
+void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz) {
+  allocnode *an;
+
+  if (!block) return;
+  an= (void*)((byte*)block - MEM_ROUND(sizeof(*an)));
+
+  assert(!to->final_allocspace);
+  assert(!from->final_allocspace);
+  
+  LIST_UNLINK(from->allocations,an);
+  LIST_LINK_TAIL(to->allocations,an);
+
+  from->interim_allocd -= sz;
+  to->interim_allocd += sz;
+
+  if (to->expires > from->expires) to->expires= from->expires;
+}
+
 void *adns__alloc_final(adns_query qu, size_t sz) {
   /* When we're in the _final stage, we _subtract_ from interim_alloc'd
    * each allocation, and use final_allocspace to point to the next free
@@ -191,36 +335,42 @@ void *adns__alloc_final(adns_query qu, size_t sz) {
   return rp;
 }
 
-void adns__reset_cnameonly(adns_query qu) {
-  /* fixme: cancel children */
+static void cancel_children(adns_query qu) {
+  adns_query cqu, ncqu;
+
+  for (cqu= qu->children.head; cqu; cqu= ncqu) {
+    ncqu= cqu->siblings.next;
+    adns_cancel(cqu);
+  }
+  LIST_INIT(qu->children);
+}
+
+void adns__reset_preserved(adns_query qu) {
   assert(!qu->final_allocspace);
+  cancel_children(qu);
   qu->answer->nrrs= 0;
-  qu->answer->rrs= 0;
-  qu->interim_allocd= qu->answer->cname ? MEM_ROUND(strlen(qu->answer->cname)+1) : 0;
+  qu->answer->rrs.untyped= 0;
+  qu->interim_allocd= qu->preserved_allocd;
 }
 
 static void free_query_allocs(adns_query qu) {
   allocnode *an, *ann;
-  adns_query cqu, ncqu;
 
-  for (cqu= qu->children.head; cqu; cqu= ncqu) {
-    ncqu= cqu->siblings.next;
-    adns_cancel(cqu);
-  }
-  for (an= qu->allocations; an; an= ann) { ann= an->next; free(an); }
+  cancel_children(qu);
+  for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); }
   adns__vbuf_free(&qu->vb);
 }
 
-void adns_cancel(adns_query query) {
+void adns_cancel(adns_query qu) {
   switch (qu->state) {
   case query_udp: case query_tcpwait: case query_tcpsent:
-    LIST_UNLINK(ads->timew,qu);
+    LIST_UNLINK(qu->ads->timew,qu);
     break;
   case query_child:
-    LIST_UNLINK(ads->childw,qu);
+    LIST_UNLINK(qu->ads->childw,qu);
     break;
   case query_done:
-    LIST_UNLINK(ads->output,qu);
+    LIST_UNLINK(qu->ads->output,qu);
     break;
   default:
     abort();
@@ -229,51 +379,94 @@ void adns_cancel(adns_query query) {
   free(qu->answer);
   free(qu);
 }
-  
-void adns__query_done(adns_query qu) {
+
+void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now) {
+  time_t max;
+
+  assert(ttl <= MAXTTLBELIEVE);
+  max= now.tv_sec + ttl;
+  if (qu->expires < max) return;
+  qu->expires= max;
+}
+
+static void makefinal_query(adns_query qu) {
   adns_answer *ans;
   int rrn;
 
   ans= qu->answer;
-  
+
   if (qu->interim_allocd) {
-    if (qu->answer->nrrs && qu->typei->diff_needswap) {
-      if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
-	adns__query_fail(qu,adns_s_nolocalmem);
-	return;
-      }
-    }
     ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
-    if (!ans) {
-      qu->answer->cname= 0;
-      adns__query_fail(qu, adns_s_nolocalmem);
-      return;
-    }
+    if (!ans) goto x_nomem;
     qu->answer= ans;
   }
 
   qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans));
   adns__makefinal_str(qu,&ans->cname);
+  adns__makefinal_str(qu,&ans->owner);
   
   if (ans->nrrs) {
     adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz);
 
     for (rrn=0; rrn<ans->nrrs; rrn++)
       qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz);
-
-    if (qu->typei->diff_needswap)
-      adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
-		  qu->vb.buf, qu->typei->diff_needswap);
   }
-
+  
   free_query_allocs(qu);
+  return;
   
+ x_nomem:
+  qu->preserved_allocd= 0;
+  qu->answer->cname= 0;
+  qu->answer->owner= 0;
+  adns__reset_preserved(qu); /* (but we just threw away the preserved stuff) */
+
+  qu->answer->status= adns_s_nomemory;
+  free_query_allocs(qu);
+}
+
+void adns__query_done(adns_query qu) {
+  adns_answer *ans;
+  adns_query parent;
+
   qu->id= -1;
-  LIST_LINK_TAIL(qu->ads->output,qu);
+  ans= qu->answer;
+
+  if (qu->flags & adns_qf_owner && qu->flags & adns_qf_search &&
+      ans->status != adns_s_nomemory) {
+    if (!save_owner(qu, qu->search_vb.buf, qu->search_vb.used)) {
+      adns__query_fail(qu,adns_s_nomemory);
+      return;
+    }
+  }
+
+  if (ans->nrrs && qu->typei->diff_needswap) {
+    if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
+      adns__query_fail(qu,adns_s_nomemory);
+      return;
+    }
+    adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
+		qu->vb.buf,
+		(int(*)(void*, const void*, const void*))qu->typei->diff_needswap,
+		qu->ads);
+  }
+
+  ans->expires= qu->expires;
+  parent= qu->parent;
+  if (parent) {
+    LIST_UNLINK_PART(parent->children,qu,siblings.);
+    if (!parent->children.head) LIST_UNLINK(qu->ads->childw,parent);
+    qu->ctx.callback(parent,qu);
+    free_query_allocs(qu);
+    free(qu);
+  } else {
+    makefinal_query(qu);
+    LIST_LINK_TAIL(qu->ads->output,qu);
+  }
 }
 
 void adns__query_fail(adns_query qu, adns_status stat) {
-  adns__reset_cnameonly(qu);
+  adns__reset_preserved(qu);
   qu->answer->status= stat;
   adns__query_done(qu);
 }