+ * README updated (from www home page).

[adns] / src / query.c

diff --git a/src/query.c b/src/query.c
index 7f65bc11b24fbc1d451b103555eab8c19a84721c..37306d17d078e8e487f74ff822f5d4d924be318b 100644 (file)
--- a/src/query.c
+++ b/src/query.c
@@ -5,7 +5,12 @@
  * - query submission and cancellation (user-visible and internal)
  */
 /*
  * - 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
+ *    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
  *  
  *  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


@@ -32,81 +37,159 @@
 
 #include "internal.h"
 
 
 #include "internal.h"
 

-int adns__internal_submit(adns_state ads, adns_query *query_r,
-                         adns_rrtype type, 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;
   adns_query qu;

-  adns_status stat;
-  int ol, id, r;
-  struct timeval now;
-  const typeinfo *typei;
-  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->state= query_udp;
+  
+  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_tosend;

   qu->back= qu->next= qu->parent= 0;
   LIST_INIT(qu->children);
   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->interim_allocd= 0;

-  qu->perm_used= 0;
+  qu->preserved_allocd= 0;
+  qu->final_allocspace= 0;

 
 

-  qu->typei= adns__findtype(type);
+  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;
   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->flags= flags;

-  qu->udpretries= 0;
+  qu->retries= 0;

   qu->udpnextserver= 0;
   qu->udpnextserver= 0;

-  qu->udpsent= qu->tcpfailed= 0;
+  qu->udpsent= 0;

   timerclear(&qu->timeout);
   timerclear(&qu->timeout);

-  memcpy(&qu->context,ctx,sizeof(qu->context));
-  memcpy(qu->owner,owner,ol); qu->owner[ol]= 0;
+  qu->expires= now.tv_sec + MAXTTLBELIEVE;
+
+  memset(&qu->ctx,0,sizeof(qu->ctx));

 
   qu->answer->status= adns_s_ok;
 
   qu->answer->status= adns_s_ok;

-  qu->answer->cname= 0;
-  qu->answer->type= type;
+  qu->answer->cname= qu->answer->owner= 0;
+  qu->answer->type= typei->type;
+  qu->answer->expires= -1;

   qu->answer->nrrs= 0;
   qu->answer->nrrs= 0;

-  qu->answer->rrs= 0;
+  qu->answer->rrs.untyped= 0;
+  qu->answer->rrsz= typei->rrsz;

 
 

-  if (qu->typei) {
-    qu->answer->rrsz= qu->rrsz;
-  } else {
-    qu->answer->rrsz= -1;
-    failstat= adns_s_notimplemented;
-  }
-  
-  *query_r= qu;
+  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.  Takes over the memory for qumsg_vb.
+   */

 
 

-  qu->query_dgram= malloc(qumsg_vb->used);
-  if (!qu->query_dgram) {
-    adns__query_fail(ads,qu,adns_s_nomemory);
-    return;
-  }
-  memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used);

   qu->vb= *qumsg_vb;
   adns__vbuf_init(qumsg_vb);
   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);
+  
+  adns__query_send(qu,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;
+}
+
+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;
+
+  vb= qu->vb;

   
   

-  if (failstat) {
-    adns__query_fail(ads,qu,failstat);
-    return;
+  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++];
+    }

   }
   }

-  adns__query_udp(ads,qu,now);
-  adns__autosys(ads,now);

 
 

-  return 0;
+  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;
+    }
+  }

 
 

- x_freequ_nomemory:
-  free(qu);
- x_nomemory:
-  free(query_dgram);
-  return adns_s_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);
+  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,
 }
 
 int adns_submit(adns_state ads,


@@ -115,25 +198,86 @@ int adns_submit(adns_state ads,
                adns_queryflags flags,
                void *context,
                adns_query *query_r) {
                adns_queryflags flags,
                void *context,
                adns_query *query_r) {

-  qcontext ctx;
-  int id;
-  vbuf vb;
+  int r, ol, ndots;
+  adns_status stat;
+  const typeinfo *typei;
+  struct timeval now;
+  adns_query qu;
+  const char *p;

 
 

-  ctx.ext= context;
-  r= gettimeofday(&now,0); if (r) return errno;
-  id= 0;
+  adns__consistency(ads,0,cc_entex);

 
 

-  adns__vbuf_init(&vb);
+  typei= adns__findtype(type);
+  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->ctx.ext= context;
+  qu->ctx.callback= 0;
+  memset(&qu->ctx.info,0,sizeof(qu->ctx.info));
+
+  *query_r= qu;

 
   ol= strlen(owner);
 
   ol= strlen(owner);

-  if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_invaliddomain; 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;
+    qu->flags= flags;
+    ol--;
+  }
+
+  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);
+  }
+  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(adns_state ads,
+                       const struct sockaddr *addr,
+                       adns_rrtype type,
+                       adns_queryflags flags,
+                       void *context,
+                       adns_query *query_r) {
+  const unsigned char *iaddr;
+  char buf[30];
+
+  if (type != adns_r_ptr && type != adns_r_ptr_raw) return EINVAL;
+  flags &= ~adns_qf_search;

 
 

-  stat= adns__mkquery(ads,&vb, &id, owner,ol, typei,flags);
-                       
- xit:
-  return adns__internal_submit(ads,query_r, type,&vb,id, flags,now, stat,&ctx);        
+  if (addr->sa_family != AF_INET) return ENOSYS;
+  iaddr= (const unsigned char*) &(((const struct sockaddr_in*)addr) -> sin_addr);
+
+  sprintf(buf, "%d.%d.%d.%d.in-addr.arpa",
+         iaddr[3], iaddr[2], iaddr[1], iaddr[0]);
+
+  return adns_submit(ads,buf,type,flags,context,query_r);

 }
 
 int adns_synchronous(adns_state ads,
 }
 
 int adns_synchronous(adns_state ads,


@@ -147,33 +291,65 @@ int adns_synchronous(adns_state ads,
   r= adns_submit(ads,owner,type,flags,0,&qu);
   if (r) return r;
 
   r= adns_submit(ads,owner,type,flags,0,&qu);
   if (r) return r;
 

-  do {
-    r= adns_wait(ads,&qu,answer_r,0);
-  } while (r==EINTR);
-  if (r) adns_cancel(ads,qu);
-  return r;
-}
+  r= adns_wait(ads,&qu,answer_r,0);
+  if (r) adns_cancel(qu);

 
 

-void adns_cancel(adns_state ads, adns_query query) {
-  abort(); /* fixme */
+  return r;

 }
 
 }
 

-void *adns__alloc_interim(adns_state ads, adns_query qu, size_t sz) {
+static void *alloc_common(adns_query qu, size_t sz) {

   allocnode *an;
 
   allocnode *an;
 

+  if (!sz) return qu; /* Any old pointer will do */

   assert(!qu->final_allocspace);
   assert(!qu->final_allocspace);

-  sz= MEM_ROUND(sz);

   an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
   an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));

-  if (!an) {
-    adns__query_fail(ads,qu,adns_s_nolocalmem);
-    return 0;
-  }
-  qu->permalloclen += sz;
-  an->next= qu->allocations;
-  qu->allocations= an;
+  if (!an) return 0;
+  LIST_LINK_TAIL(qu->allocations,an);

   return (byte*)an + MEM_ROUND(sizeof(*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 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
 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


@@ -190,42 +366,155 @@ void *adns__alloc_final(adns_query qu, size_t sz) {
   return rp;
 }
 
   return rp;
 }
 

-void adns__reset_cnameonly(adns_state ads, adns_query qu) {
-  assert(qu->final_allocspace);
+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);
+  }
+}
+
+void adns__reset_preserved(adns_query qu) {
+  assert(!qu->final_allocspace);
+  cancel_children(qu);

   qu->answer->nrrs= 0;
   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 adns__query_done(adns_state ads, adns_query qu) {
-  adns_answer *ans;
+static void free_query_allocs(adns_query qu) {

   allocnode *an, *ann;
   allocnode *an, *ann;

-  int i;

 
 

-  qu->answer= ans= realloc(qu->answer,
-                          MEM_ROUND(MEM_ROUND(sizeof(*ans)) +
-                                    qu->interim_allocd));
-  qu->final_allocspace= (byte*)qu->answer + MEM_ROUND(sizeof(*ans));
+  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);
+}
+
+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_tosend:
+    LIST_UNLINK(ads->udpw,qu);
+    break;
+  case query_tcpw:
+    LIST_UNLINK(ads->tcpw,qu);
+    break;
+  case query_childw:
+    LIST_UNLINK(ads->childw,qu);
+    break;
+  case query_done:
+    LIST_UNLINK(ads->output,qu);
+    break;
+  default:
+    abort();
+  }
+  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) {
+  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) {
+    ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
+    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->cname);

+  adns__makefinal_str(qu,&ans->owner);
+  

   if (ans->nrrs) {
   if (ans->nrrs) {

-    adns__makefinal_block(qu,&ans->rrs.untyped,ans->rrsz*ans->nrrs);
-    for (i=0; i<ans->nrrs; i++)
-      qu->typei->makefinal(ads,qu,ans->rrs.bytes+ans->rrsz*i);
+    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);

   }
   }

+  
+  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) */

 
 

-  for (an= qu->allocations; an; an= ann) { ann= an->next; free(an); }
+  qu->answer->status= adns_s_nomemory;
+  free_query_allocs(qu);
+}
+
+void adns__query_done(adns_query qu) {
+  adns_answer *ans;
+  adns_query parent;
+
+  cancel_children(qu);

 
 

-  adns__vbuf_free(&qu->vb);
-  

   qu->id= -1;
   qu->id= -1;

-  LIST_LINK_TAIL(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.);
+    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_state ads, adns_query qu, adns_status stat) {
-  adns__reset_cnameonly(ads,qu);
+void adns__query_fail(adns_query qu, adns_status stat) {
+  adns__reset_preserved(qu);

   qu->answer->status= stat;
   qu->answer->status= stat;

-  adns__query_done(ads,qu);
+  adns__query_done(qu);

 }
 
 void adns__makefinal_str(adns_query qu, char **strp) {
 }
 
 void adns__makefinal_str(adns_query qu, char **strp) {


@@ -233,17 +522,19 @@ void adns__makefinal_str(adns_query qu, char **strp) {
   char *before, *after;
 
   before= *strp;
   char *before, *after;
 
   before= *strp;

+  if (!before) return;

   l= strlen(before)+1;
   after= adns__alloc_final(qu,l);
   memcpy(after,before,l);
   *strp= after;  
 }
 
   l= strlen(before)+1;
   after= adns__alloc_final(qu,l);
   memcpy(after,before,l);
   *strp= after;  
 }
 

-void adns__makefinal_block(adns__query qu, void **blpp, size_t sz) {
-  void *after;
+void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
+  void *before, *after;

 
 

+  before= *blpp;
+  if (!before) return;

   after= adns__alloc_final(qu,sz);
   after= adns__alloc_final(qu,sz);

-  memcpy(after,*blpp,sz);
+  memcpy(after,before,sz);

   *blpp= after;
 }
   *blpp= after;
 }

-