X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Fquery.c;h=53eecd9b902e47ff11c30700da4a8dcbfbfc4032;hp=81c04cb2b1e44abba0588987e0b578605930d8dc;hb=d942707de2dd9809338882f09a9f23316dc8be36;hpb=660d7d3b4af029c3e86fdfe1ac078815c41ed79e

diff --git a/src/query.c b/src/query.c
index 81c04cb..53eecd9 100644
--- a/src/query.c
+++ b/src/query.c
@@ -5,7 +5,12 @@
  * - query submission and cancellation (user-visible and internal)
  */
 /*
- *  This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
+ *  This file is
+ *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ *  It is part of adns, which is
+ *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *    Copyright (C) 1999 Tony Finch <dot@dotat.at>
  *  
  *  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
@@ -27,7 +32,6 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
-#include <string.h>
 
 #include <sys/time.h>
 
@@ -42,12 +46,13 @@ static adns_query query_alloc(adns_state ads, const typeinfo *typei,
   qu->answer= malloc(sizeof(*qu->answer));  if (!qu->answer) { free(qu); return 0; }
   
   qu->ads= ads;
-  qu->state= query_udp;
+  qu->state= query_tosend;
   qu->back= qu->next= qu->parent= 0;
   LIST_INIT(qu->children);
   LINK_INIT(qu->siblings);
   LIST_INIT(qu->allocations);
   qu->interim_allocd= 0;
+  qu->preserved_allocd= 0;
   qu->final_allocspace= 0;
 
   qu->typei= typei;
@@ -72,11 +77,11 @@ static adns_query query_alloc(adns_state ads, const typeinfo *typei,
   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;
 
   return qu;
@@ -99,7 +104,7 @@ static void query_submit(adns_state ads, adns_query qu,
   qu->query_dglen= qu->vb.used;
   memcpy(qu->query_dgram,qu->vb.buf,qu->vb.used);
   
-  adns__query_udp(qu,now);
+  adns__query_send(qu,now);
   adns__autosys(ads,now);
 }
 
@@ -156,12 +161,11 @@ void adns__search_next(adns_state ads, adns_query qu, struct timeval now) {
     }
   }
 
+  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;
-    } else {
-      qu->search_vb.used= qu->search_origlen;
     }
   }
 
@@ -175,6 +179,20 @@ 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,
 		const char *owner,
 		adns_rrtype type,
@@ -188,8 +206,10 @@ int adns_submit(adns_state ads,
   adns_query qu;
   const char *p;
 
+  adns__consistency(ads,0,cc_entex);
+
   typei= adns__findtype(type);
-  if (!typei) return adns_s_unknownrrtype;
+  if (!typei) return ENOSYS;
 
   r= gettimeofday(&now,0); if (r) goto x_errno;
   qu= query_alloc(ads,typei,flags,now); if (!qu) goto x_errno;
@@ -198,11 +218,16 @@ int adns_submit(adns_state ads,
   qu->ctx.callback= 0;
   memset(&qu->ctx.info,0,sizeof(qu->ctx.info));
 
+  *query_r= qu;
+
   ol= strlen(owner);
   if (!ol) { stat= adns_s_querydomaininvalid; goto x_adnsfail; }
   if (ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto x_adnsfail; }
 				 
-  if (ol>=2 && 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--;
+  }
 
   if (flags & adns_qf_search) {
     r= adns__vbuf_append(&qu->search_vb,owner,ol);
@@ -210,23 +235,26 @@ int adns_submit(adns_state ads,
 
     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);
-    return 0;
+  } 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);
   }
-
-  query_simple(ads,qu, owner,ol, typei,flags, now);
+  adns__consistency(ads,qu,cc_entex);
   return 0;
 
  x_adnsfail:
   adns__query_fail(qu,stat);
+  adns__consistency(ads,qu,cc_entex);
   return 0;
 
  x_errno:
   r= errno;
   assert(r);
+  adns__consistency(ads,0,cc_entex);
   return r;
 }
 
@@ -259,9 +287,23 @@ static void *alloc_common(adns_query qu, size_t sz) {
 }
 
 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) {
@@ -309,15 +351,14 @@ static void cancel_children(adns_query qu) {
     ncqu= cqu->siblings.next;
     adns_cancel(cqu);
   }
-  LIST_INIT(qu->children);
 }
 
-void adns__reset_cnameonly(adns_query qu) {
+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) {
@@ -325,19 +366,25 @@ static void free_query_allocs(adns_query qu) {
 
   cancel_children(qu);
   for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); }
+  LIST_INIT(qu->allocations);
   adns__vbuf_free(&qu->vb);
 }
 
 void adns_cancel(adns_query qu) {
+  adns_state ads;
+
+  ads= qu->ads;
+  adns__consistency(ads,qu,cc_entex);
+  if (qu->parent) LIST_UNLINK_PART(qu->parent->children,qu,siblings.);
   switch (qu->state) {
-  case query_udp: case query_tcpwait: case query_tcpsent:
-    LIST_UNLINK(qu->ads->timew,qu);
+  case query_tosend: case query_tcpwait: case query_tcpsent:
+    LIST_UNLINK(ads->timew,qu);
     break;
   case query_child:
-    LIST_UNLINK(qu->ads->childw,qu);
+    LIST_UNLINK(ads->childw,qu);
     break;
   case query_done:
-    LIST_UNLINK(qu->ads->output,qu);
+    LIST_UNLINK(ads->output,qu);
     break;
   default:
     abort();
@@ -345,6 +392,7 @@ void adns_cancel(adns_query qu) {
   free_query_allocs(qu);
   free(qu->answer);
   free(qu);
+  adns__consistency(ads,0,cc_entex);
 }
 
 void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now) {
@@ -370,6 +418,7 @@ static void makefinal_query(adns_query qu) {
 
   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);
@@ -382,9 +431,12 @@ static void makefinal_query(adns_query qu) {
   return;
   
  x_nomem:
-  qu->answer->status= adns_s_nomemory;
+  qu->preserved_allocd= 0;
   qu->answer->cname= 0;
-  adns__reset_cnameonly(qu);
+  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);
 }
 
@@ -392,9 +444,19 @@ void adns__query_done(adns_query qu) {
   adns_answer *ans;
   adns_query parent;
 
+  cancel_children(qu);
+
   qu->id= -1;
   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);
@@ -410,17 +472,19 @@ void adns__query_done(adns_query qu) {
   parent= qu->parent;
   if (parent) {
     LIST_UNLINK_PART(parent->children,qu,siblings.);
+    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);
+    qu->state= query_done;
   }
 }
 
 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);
 }