X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Fquery.c;h=ebbfd53a135416ea7b6575121b846a67d8c8f6ab;hp=38bc3c2b29c70bc5f20c66a13f640a19363d7f49;hb=4c6fd94de34c2949a89271350f963ce0b12375e1;hpb=22181a31434b2439e41200ec65a95cb8605d41f5

diff --git a/src/query.c b/src/query.c
index 38bc3c2..ebbfd53 100644
--- a/src/query.c
+++ b/src/query.c
@@ -5,7 +5,11 @@
  * - 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 part of adns, which is
+ *    Copyright (C) 1997-2000,2003,2006  Ian Jackson
+ *    Copyright (C) 1999-2000,2003,2006  Tony Finch
+ *    Copyright (C) 1991 Massachusetts Institute of Technology
+ *  (See the file INSTALL for full details.)
  *  
  *  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
@@ -27,27 +31,29 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
-#include <string.h>
 
 #include <sys/time.h>
 
 #include "internal.h"
 
-static adns_query query_alloc(adns_state ads, const typeinfo *typei,
+static adns_query query_alloc(adns_state ads,
+			      const typeinfo *typei, adns_rrtype type,
 			      adns_queryflags flags, struct timeval now) {
   /* Allocate a virgin query and return it. */
   adns_query qu;
   
   qu= malloc(sizeof(*qu));  if (!qu) return 0;
-  qu->answer= malloc(sizeof(*qu->answer));  if (!qu->answer) { free(qu); return 0; }
+  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;
@@ -61,11 +67,11 @@ static adns_query query_alloc(adns_state ads, const typeinfo *typei,
   adns__vbuf_init(&qu->search_vb);
   qu->search_origlen= qu->search_pos= qu->search_doneabs= 0;
 
-  qu->id= 0;
+  qu->id= -2; /* will be overwritten with real id before we leave adns */
   qu->flags= flags;
-  qu->udpretries= 0;
+  qu->retries= 0;
   qu->udpnextserver= 0;
-  qu->udpsent= qu->tcpfailed= 0;
+  qu->udpsent= 0;
   timerclear(&qu->timeout);
   qu->expires= now.tv_sec + MAXTTLBELIEVE;
 
@@ -73,11 +79,11 @@ static adns_query query_alloc(adns_state ads, const typeinfo *typei,
 
   qu->answer->status= adns_s_ok;
   qu->answer->cname= qu->answer->owner= 0;
-  qu->answer->type= typei->type;
+  qu->answer->type= type;
   qu->answer->expires= -1;
   qu->answer->nrrs= 0;
-  qu->answer->rrs= 0;
-  qu->answer->rrsz= typei->rrsz;
+  qu->answer->rrs.untyped= 0;
+  qu->answer->rrsz= typei->getrrsz(typei,type);
 
   return qu;
 }
@@ -86,7 +92,7 @@ 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.
+   * and submits it.  Cannot fail.  Takes over the memory for qumsg_vb.
    */
 
   qu->vb= *qumsg_vb;
@@ -99,40 +105,98 @@ 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__autosys(ads,now);
+  adns__query_send(qu,now);
+}
+
+adns_status adns__ckl_hostname(adns_state ads, adns_queryflags flags,
+			       union checklabel_state *cls,
+			       qcontext *ctx, int labnum,
+			       const char *label, int lablen)
+{
+  int i, c;
+
+  if (flags & adns_qf_quoteok_query) return adns_s_ok;
+  for (i=0; i<lablen; i++) {
+    c= label[i];
+    if (c == '-') {
+      if (!i) return adns_s_querydomaininvalid;
+    } else if (!ctype_alpha(c) && !ctype_digit(c)) {
+      return adns_s_querydomaininvalid;
+    }
+  }
+  return adns_s_ok;
+}
+
+static adns_status check_domain_name(adns_state ads, adns_queryflags flags,
+				     qcontext *ctx, const typeinfo *typei,
+				     const byte *dgram, int dglen)
+{
+  findlabel_state fls;
+  adns_status err;
+  int labnum= 0, labstart, lablen;
+  union checklabel_state cls;
+
+  adns__findlabel_start(&fls,ads, -1,0, dgram,dglen,dglen, DNS_HDRSIZE,0);
+  do {
+    err= adns__findlabel_next(&fls, &lablen,&labstart);
+    assert(!err); assert(lablen >= 0);
+    err= typei->checklabel(ads,flags, &cls,ctx,
+			   labnum++, dgram+labstart,lablen);
+    if (err) return err;
+  } while (lablen);
+  return adns_s_ok;
 }
 
 adns_status adns__internal_submit(adns_state ads, adns_query *query_r,
-				  const typeinfo *typei, vbuf *qumsg_vb, int id,
+				  const typeinfo *typei, adns_rrtype type,
+				  vbuf *qumsg_vb, int id,
 				  adns_queryflags flags, struct timeval now,
-				  const qcontext *ctx) {
+				  qcontext *ctx) {
   adns_query qu;
+  adns_status err;
 
-  qu= query_alloc(ads,typei,flags,now);
-  if (!qu) { adns__vbuf_free(qumsg_vb); return adns_s_nomemory; }
+  err= check_domain_name(ads, flags,ctx,typei, qumsg_vb->buf,qumsg_vb->used);
+  if (err) goto x_err;
+  qu= query_alloc(ads,typei,type,flags,now);
+  if (!qu) { err = adns_s_nomemory; goto x_err; }
   *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_err:
+  adns__vbuf_free(qumsg_vb);
+  return err;
 }
 
 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;
+  vbuf vb_new;
   int id;
   adns_status stat;
 
-  adns__vbuf_init(&vb);
-  
-  stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags);
+  stat= adns__mkquery(ads,&qu->vb,&id, owner,ol,
+		      typei,qu->answer->type, flags);
+  if (stat) {
+    if (stat == adns_s_querydomaintoolong && (flags & adns_qf_search)) {
+      adns__search_next(ads,qu,now);
+      return;
+    } else {
+      adns__query_fail(qu,stat);
+      return;
+    }
+  }
+
+  stat= check_domain_name(ads, flags,&qu->ctx,typei, qu->vb.buf,qu->vb.used);
   if (stat) { adns__query_fail(qu,stat); return; }
 
-  query_submit(ads,qu, typei,&vb,id, flags,now);
+  vb_new= qu->vb;
+  adns__vbuf_init(&qu->vb);
+  query_submit(ads,qu, typei,&vb_new,id, flags,now);
 }
 
 void adns__search_next(adns_state ads, adns_query qu, struct timeval now) {
@@ -145,8 +209,8 @@ void adns__search_next(adns_state ads, adns_query qu, struct timeval now) {
   } else {
     if (qu->search_pos >= ads->nsearchlist) {
       if (qu->search_doneabs) {
+	qu->search_vb.used= qu->search_origlen;
 	stat= adns_s_nxdomain; goto x_fail;
-	return;
       } else {
 	nextentry= 0;
 	qu->search_doneabs= 1;
@@ -159,17 +223,19 @@ 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;
-    }
+	!adns__vbuf_appendstr(&qu->search_vb,nextentry))
+      goto x_nomemory;
   }
 
   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);
+  query_simple(ads,qu, qu->search_vb.buf, qu->search_vb.used,
+	       qu->typei, qu->flags, now);
   return;
-  
+
+x_nomemory:
+  stat= adns_s_nomemory;
 x_fail:
   adns__query_fail(qu,stat);
 }
@@ -178,10 +244,12 @@ static int save_owner(adns_query qu, const char *owner, int ol) {
   /* Returns 1 if OK, otherwise there was no memory. */
   adns_answer *ans;
 
+  if (!(qu->flags & adns_qf_owner)) return 1;
+
   ans= qu->answer;
   assert(!ans->owner);
 
-  ans->owner= adns__alloc_interim(qu,ol+1);  if (!ans->owner) return 0;
+  ans->owner= adns__alloc_preserved(qu,ol+1);  if (!ans->owner) return 0;
 
   memcpy(ans->owner,owner,ol);
   ans->owner[ol]= 0;
@@ -201,15 +269,18 @@ 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;
+  qu= query_alloc(ads,typei,type,flags,now); if (!qu) goto x_errno;
   
   qu->ctx.ext= context;
   qu->ctx.callback= 0;
-  memset(&qu->ctx.info,0,sizeof(qu->ctx.info));
+  memset(&qu->ctx.pinfo,0,sizeof(qu->ctx.pinfo));
+  memset(&qu->ctx.tinfo,0,sizeof(qu->ctx.tinfo));
 
   *query_r= qu;
 
@@ -217,7 +288,11 @@ int adns_submit(adns_state ads,
   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;
+    qu->flags= flags;
+    ol--;
+  }
 
   if (flags & adns_qf_search) {
     r= adns__vbuf_append(&qu->search_vb,owner,ol);
@@ -233,18 +308,55 @@ int adns_submit(adns_state ads,
     }
     query_simple(ads,qu, owner,ol, typei,flags, now);
   }
+  adns__autosys(ads,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;
 }
 
+int adns_submit_reverse_any(adns_state ads,
+			    const struct sockaddr *addr,
+			    const char *zone,
+			    adns_rrtype type,
+			    adns_queryflags flags,
+			    void *context,
+			    adns_query *query_r) {
+  char *buf, *buf_free = 0;
+  char shortbuf[100];
+  int r;
+
+  flags &= ~adns_qf_search;
+
+  buf = shortbuf;
+  r= adns__make_reverse_domain(addr,zone, &buf,sizeof(shortbuf),&buf_free);
+  if (r) return r;
+  r= adns_submit(ads,buf,type,flags,context,query_r);
+  free(buf_free);
+  return r;
+}
+
+int adns_submit_reverse(adns_state ads,
+			const struct sockaddr *addr,
+			adns_rrtype type,
+			adns_queryflags flags,
+			void *context,
+			adns_query *query_r) {
+  if (((type^adns_r_ptr) & adns_rrt_reprmask) &&
+      ((type^adns_r_ptr_raw) & adns_rrt_reprmask))
+    return EINVAL;
+  return adns_submit_reverse_any(ads,addr,0,type,flags,context,query_r);
+}
+
 int adns_synchronous(adns_state ads,
 		     const char *owner,
 		     adns_rrtype type,
@@ -270,24 +382,59 @@ static void *alloc_common(adns_query qu, size_t sz) {
   an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
   if (!an) return 0;
   LIST_LINK_TAIL(qu->allocations,an);
+  an->sz= sz;
   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;
+}
+
+static allocnode *alloc_info(adns_query qu, void *p, size_t *sz_r) {
+  allocnode *an;
+
+  if (!p || p == qu) { *sz_r= 0; return 0; }
+  an= (allocnode *)((byte *)p - MEM_ROUND(sizeof(allocnode)));
+  *sz_r= MEM_ROUND(an->sz);
+  return an;
+}
+
+void adns__free_interim(adns_query qu, void *p) {
+  size_t sz;
+  allocnode *an= alloc_info(qu, p, &sz);
+
+  if (!an) return;
+  assert(!qu->final_allocspace);
+  LIST_UNLINK(qu->allocations, an);
+  free(an);
+  qu->interim_allocd -= sz;
 }
 
 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;
+void adns__transfer_interim(adns_query from, adns_query to, void *block) {
+  size_t sz;
+  allocnode *an= alloc_info(from, block, &sz);
 
-  if (!block) return;
-  an= (void*)((byte*)block - MEM_ROUND(sizeof(*an)));
+  if (!an) return;
 
   assert(!to->final_allocspace);
   assert(!from->final_allocspace);
@@ -324,15 +471,14 @@ 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) {
@@ -340,19 +486,31 @@ 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);
+  adns__vbuf_free(&qu->search_vb);
+  free(qu->query_dgram);
+  qu->query_dgram= 0;
 }
 
 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:
+    LIST_UNLINK(ads->udpw,qu);
     break;
-  case query_child:
-    LIST_UNLINK(qu->ads->childw,qu);
+  case query_tcpw:
+    LIST_UNLINK(ads->tcpw,qu);
+    break;
+  case query_childw:
+    LIST_UNLINK(ads->childw,qu);
     break;
   case query_done:
-    LIST_UNLINK(qu->ads->output,qu);
+    LIST_UNLINK(ads->output,qu);
     break;
   default:
     abort();
@@ -360,9 +518,11 @@ 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) {
+void adns__update_expires(adns_query qu, unsigned long ttl,
+			  struct timeval now) {
   time_t max;
 
   assert(ttl <= MAXTTLBELIEVE);
@@ -378,7 +538,8 @@ static void makefinal_query(adns_query qu) {
   ans= qu->answer;
 
   if (qu->interim_allocd) {
-    ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
+    ans= realloc(qu->answer,
+		 MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
     if (!ans) goto x_nomem;
     qu->answer= ans;
   }
@@ -398,9 +559,12 @@ 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);
 }
 
@@ -408,11 +572,12 @@ 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 (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;
@@ -420,31 +585,39 @@ void adns__query_done(adns_query qu) {
   }
 
   if (ans->nrrs && qu->typei->diff_needswap) {
-    if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
+    if (!adns__vbuf_ensure(&qu->vb,qu->answer->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,
+		(int(*)(void*, const void*, const void*))
+		  qu->typei->diff_needswap,
 		qu->ads);
   }
+  if (ans->nrrs && qu->typei->postsort) {
+    qu->typei->postsort(qu->ads, ans->rrs.bytes,
+			ans->nrrs,ans->rrsz, qu->typei);
+  }
 
   ans->expires= qu->expires;
   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->answer);
     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);
 }