query.c File Reference

#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include "internal.h"

Include dependency graph for query.c:

Go to the source code of this file.

Functions
static adns_query	query_alloc (adns_state ads, const typeinfo *typei, adns_queryflags flags, struct timeval now)
static void	query_submit (adns_state ads, adns_query qu, const typeinfo *typei, vbuf *qumsg_vb, int id, adns_queryflags flags, struct timeval 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)
static void	query_simple (adns_state ads, adns_query qu, const char *owner, int ol, const typeinfo *typei, adns_queryflags flags, struct timeval now)
void	adns__search_next (adns_state ads, adns_query qu, struct timeval now)
static int	save_owner (adns_query qu, const char *owner, int ol)
int	adns_submit (adns_state ads, const char *owner, adns_rrtype type, adns_queryflags flags, void *context, adns_query *query_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)
int	adns_submit_reverse (adns_state ads, const struct sockaddr *addr, adns_rrtype type, adns_queryflags flags, void *context, adns_query *query_r)
int	adns_synchronous (adns_state ads, const char *owner, adns_rrtype type, adns_queryflags flags, adns_answer **answer_r)
static void *	alloc_common (adns_query qu, size_t sz)
void *	adns__alloc_interim (adns_query qu, size_t sz)
void *	adns__alloc_preserved (adns_query qu, size_t sz)
void *	adns__alloc_mine (adns_query qu, size_t sz)
void	adns__transfer_interim (adns_query from, adns_query to, void *block, size_t sz)
void *	adns__alloc_final (adns_query qu, size_t sz)
static void	cancel_children (adns_query qu)
void	adns__reset_preserved (adns_query qu)
static void	free_query_allocs (adns_query qu)
void	adns_cancel (adns_query qu)
void	adns__update_expires (adns_query qu, unsigned long ttl, struct timeval now)
static void	makefinal_query (adns_query qu)
void	adns__query_done (adns_query qu)
void	adns__query_fail (adns_query qu, adns_status stat)
void	adns__makefinal_str (adns_query qu, char **strp)
void	adns__makefinal_block (adns_query qu, void **blpp, size_t sz)

Function Documentation

adns__alloc_final()

void * adns__alloc_final	(	adns_query	qu,
		size_t	sz
	)

Definition at line 385 of file query.c.

                                                  {
  /* 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
   * bit.
   */
  void *rp;
 
  sz= MEM_ROUND(sz);
  rp= qu->final_allocspace;
  assert(rp);
  qu->interim_allocd -= sz;
  assert(qu->interim_allocd>=0);
  qu->final_allocspace= (byte*)rp + sz;
  return rp;
}

Referenced by adns__makefinal_block(), and adns__makefinal_str().

adns__alloc_interim()

void * adns__alloc_interim	(	adns_query	qu,
		size_t	sz
	)

Definition at line 342 of file query.c.

                                                    {
  void *rv;
 
  sz= MEM_ROUND(sz);
  rv= alloc_common(qu,sz);
  if (!rv) return 0;
  qu->interim_allocd += sz;
  return rv;
}

Referenced by adns__alloc_preserved(), adns__procdgram(), pa_txt(), pap_domain(), pap_findaddrs(), pap_mailbox822(), and pap_qstring().

adns__alloc_mine()

void * adns__alloc_mine	(	adns_query	qu,
		size_t	sz
	)

Definition at line 362 of file query.c.

                                                 {
  return alloc_common(qu,MEM_ROUND(sz));
}

Referenced by adns__procdgram().

adns__alloc_preserved()

void * adns__alloc_preserved	(	adns_query	qu,
		size_t	sz
	)

Definition at line 352 of file query.c.

                                                      {
  void *rv;
 
  sz= MEM_ROUND(sz);
  rv= adns__alloc_interim(qu,sz);
  if (!rv) return 0;
  qu->preserved_allocd += sz;
  return rv;
}

Referenced by adns__procdgram(), and save_owner().

adns__internal_submit()

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
	)

Definition at line 111 of file query.c.

                                       {
  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,(size_t) sizeof(qu->ctx));
  query_submit(ads,qu, typei,qumsg_vb,id,flags,now);
 
  return adns_s_ok;
}

Referenced by pa_ptr(), and pap_hostaddr().

adns__makefinal_block()

void adns__makefinal_block	(	adns_query	qu,
		void **	blpp,
		size_t	sz
	)

Definition at line 565 of file query.c.

                                                                  {
  void *before, *after;
 
  before= *blpp;
  if (!before) return;
  after= adns__alloc_final(qu,sz);
  memcpy(after,before, (size_t) sz);
  *blpp= after;
}

Referenced by makefinal_query(), mf_manyistr(), and mfp_hostaddr().

adns__makefinal_str()

void adns__makefinal_str	(	adns_query	qu,
		char **	strp
	)

Definition at line 553 of file query.c.

                                                     {
  int l;
  char *before, *after;
 
  before= *strp;
  if (!before) return;
  l= strlen(before)+1;
  after= adns__alloc_final(qu, (size_t) l);
  memcpy(after,before,(size_t) l);
  *strp= after;
}

Referenced by makefinal_query(), mf_intstr(), mf_intstrpair(), mf_manyistr(), mf_soa(), mf_str(), mf_strpair(), and mfp_hostaddr().

adns__query_done()

void adns__query_done

(

adns_query

qu

)

Definition at line 503 of file query.c.

                                     {
  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, (char*)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;
  }
}

Referenced by adns__procdgram(), adns__query_fail(), icb_hostaddr(), and icb_ptr().

adns__query_fail()

void adns__query_fail	(	adns_query	qu,
		adns_status	stat
	)

Definition at line 547 of file query.c.

                                                       {
  adns__reset_preserved(qu);
  qu->answer->status= stat;
  adns__query_done(qu);
}

Referenced by adns__procdgram(), adns__query_done(), adns__query_send(), adns__search_next(), adns_globalsystemfailure(), adns_submit(), icb_ptr(), query_simple(), query_submit(), tcp_events(), and timeouts_queue().

adns__reset_preserved()

void adns__reset_preserved

(

adns_query

qu

)

Definition at line 410 of file query.c.

                                          {
  assert(!qu->final_allocspace);
  cancel_children(qu);
  qu->answer->nrrs= 0;
  qu->answer->rrs.untyped= 0;
  qu->interim_allocd= qu->preserved_allocd;
}

Referenced by adns__procdgram(), adns__query_fail(), and makefinal_query().

adns__search_next()

void adns__search_next	(	adns_state	ads,
		adns_query	qu,
		struct timeval	now
	)

Definition at line 151 of file query.c.

                                                                          {
  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,(byte*)".",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, (char*)qu->search_vb.buf, qu->search_vb.used, qu->typei, qu->flags, now);
  return;
 
x_fail:
  adns__query_fail(qu,stat);
}

Referenced by adns__procdgram(), adns_submit(), and query_simple().

adns__transfer_interim()

void adns__transfer_interim	(	adns_query	from,
		adns_query	to,
		void *	block,
		size_t	sz
	)

Definition at line 366 of file query.c.

                                                                                    {
  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);
 
  sz= MEM_ROUND(sz);
  from->interim_allocd -= sz;
  to->interim_allocd += sz;
 
  if (to->expires > from->expires) to->expires= from->expires;
}

Referenced by icb_hostaddr().

adns__update_expires()

void adns__update_expires	(	adns_query	qu,
		unsigned long	ttl,
		struct timeval	now
	)

Definition at line 458 of file query.c.

                                                                                {
  time_t max;
 
  assert(ttl <= MAXTTLBELIEVE);
  max= now.tv_sec + ttl;
  if (qu->expires < max) return;
  qu->expires= max;
}

Referenced by adns__procdgram(), and pap_findaddrs().

adns_cancel()

void adns_cancel

(

adns_query

qu

)

Definition at line 430 of file query.c.

                                {
  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);
}

Referenced by adns_finish(), adns_synchronous(), cancel_children(), and of_cancel_id().

adns_submit()

int adns_submit	(	adns_state	ads,
		const char *	owner,
		adns_rrtype	type,
		adns_queryflags	flags,
		void *	context,
		adns_query *	query_r
	)

Definition at line 204 of file query.c.

                             {
  int r, ol, ndots;
  adns_status stat;
  const typeinfo *typei;
  struct timeval now;
  adns_query qu;
  const char *p;
 
  adns__consistency(ads,0,cc_entex);
 
  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);
  if (!ol) { stat= adns_s_querydomaininvalid; goto x_adnsfail; }
  if (ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto x_adnsfail; }
 
  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,(byte*)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;
}

Referenced by adns_submit_reverse_any(), adns_synchronous(), main(), query_do(), and readline().

adns_submit_reverse()

int adns_submit_reverse	(	adns_state	ads,
		const struct sockaddr *	addr,
		adns_rrtype	type,
		adns_queryflags	flags,
		void *	context,
		adns_query *	query_r
	)

Definition at line 304 of file query.c.

                                 {
  if (type != adns_r_ptr && type != adns_r_ptr_raw) return EINVAL;
  return adns_submit_reverse_any(ads,addr,"in-addr.arpa",type,flags,context,query_r);
}

Referenced by of_ptr(), and procaddr().

adns_submit_reverse_any()

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
	)

Definition at line 271 of file query.c.

                                     {
  const unsigned char *iaddr;
  char *buf, *buf_free;
  char shortbuf[100];
  int r, lreq;
 
  flags &= ~adns_qf_search;
 
  if (addr->sa_family != AF_INET) return ENOSYS;
  iaddr= (const unsigned char*) &(((const struct sockaddr_in*)addr) -> sin_addr);
 
  lreq= strlen(zone) + 4*4 + 1;
  if (lreq > (int)sizeof(shortbuf)) {
    buf= malloc( strlen(zone) + 4*4 + 1 );
    if (!buf) return errno;
    buf_free= buf;
  } else {
    buf= shortbuf;
    buf_free= 0;
  }
  sprintf(buf, "%d.%d.%d.%d.%s", iaddr[3], iaddr[2], iaddr[1], iaddr[0], zone);
 
  r= adns_submit(ads,buf,type,flags,context,query_r);
  free(buf_free);
  return r;
}

Referenced by adns_submit_reverse(), and of_reverse().

adns_synchronous()

int adns_synchronous	(	adns_state	ads,
		const char *	owner,
		adns_rrtype	type,
		adns_queryflags	flags,
		adns_answer **	answer_r
	)

Definition at line 314 of file query.c.

                                     {
  adns_query qu;
  int r;
 
  r= adns_submit(ads,owner,type,flags,0,&qu);
  if (r) return r;
 
  r= adns_wait(ads,&qu,answer_r,0);
  if (r) adns_cancel(qu);
 
  return r;
}

Referenced by Query_Main().

alloc_common()

static void * alloc_common ( adns_query  qu, size_t  sz  )

static

Definition at line 331 of file query.c.

                                                    {
  allocnode *an;
 
  if (!sz) return qu; /* Any old pointer will do */
  assert(!qu->final_allocspace);
  an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
  if (!an) return 0;
  LIST_LINK_TAIL(qu->allocations,an);
  return (byte*)an + MEM_ROUND(sizeof(*an));
}

Referenced by adns__alloc_interim(), and adns__alloc_mine().

cancel_children()

static void cancel_children ( adns_query  qu )

static

Definition at line 401 of file query.c.

                                           {
  adns_query cqu, ncqu;
 
  for (cqu= qu->children.head; cqu; cqu= ncqu) {
    ncqu= cqu->siblings.next;
    adns_cancel(cqu);
  }
}

Referenced by adns__query_done(), adns__reset_preserved(), and free_query_allocs().

free_query_allocs()

static void free_query_allocs ( adns_query  qu )

static

Definition at line 418 of file query.c.

                                             {
  allocnode *an, *ann;
 
  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;
}

Referenced by adns__query_done(), adns_cancel(), and makefinal_query().

makefinal_query()

static void makefinal_query ( adns_query  qu )

static

Definition at line 467 of file query.c.

                                           {
  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->owner);
 
  if (ans->nrrs) {
    adns__makefinal_block(qu, &ans->rrs.untyped, (size_t) 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) */
 
  qu->answer->status= adns_s_nomemory;
  free_query_allocs(qu);
}

Referenced by adns__query_done().

query_alloc()

static adns_query query_alloc ( adns_state  ads, const typeinfo *  typei, adns_queryflags  flags, struct timeval  now  )

static

Definition at line 41 of file query.c.

                                                             {
  /* 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->ads= ads;
  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;
  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->search_vb);
  qu->search_origlen= qu->search_pos= qu->search_doneabs= 0;
 
  qu->id= -2; /* will be overwritten with real id before we leave adns */
  qu->flags= flags;
  qu->retries= 0;
  qu->udpnextserver= 0;
  qu->udpsent= 0;
  timerclear(&qu->timeout);
  qu->expires= now.tv_sec + MAXTTLBELIEVE;
 
  memset(&qu->ctx,0,sizeof(qu->ctx));
 
  qu->answer->status= adns_s_ok;
  qu->answer->cname= qu->answer->owner= 0;
  qu->answer->type= typei->type;
  qu->answer->expires= -1;
  qu->answer->nrrs= 0;
  qu->answer->rrs.untyped= 0;
  qu->answer->rrsz= typei->rrsz;
 
  return qu;
}

Referenced by adns__internal_submit(), and adns_submit().

query_simple()

static void query_simple ( adns_state  ads, adns_query  qu, const char *  owner, int  ol, const typeinfo *  typei, adns_queryflags  flags, struct timeval  now  )

static

Definition at line 127 of file query.c.

                                 {
  vbuf vb_new;
  int id;
  adns_status stat;
 
  stat= adns__mkquery(ads,&qu->vb,&id, owner,ol, typei,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;
    }
  }
 
  vb_new= qu->vb;
  adns__vbuf_init(&qu->vb);
  query_submit(ads,qu, typei,&vb_new,id, flags,now);
}

Referenced by adns__search_next(), and adns_submit().

query_submit()

static void query_submit ( adns_state  ads, adns_query  qu, const typeinfo *  typei, vbuf *  qumsg_vb, int  id, adns_queryflags  flags, struct timeval  now  )

static

Definition at line 91 of file query.c.

                                                        {
  /* Fills in the query message in for a previously-allocated query,
   * and submits it.  Cannot fail.  Takes over the memory for qumsg_vb.
   */
 
  qu->vb= *qumsg_vb;
  adns__vbuf_init(qumsg_vb);
 
  qu->query_dgram= malloc( (size_t) 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,(size_t) qu->vb.used);
 
  adns__query_send(qu,now);
}

Referenced by adns__internal_submit(), and query_simple().

save_owner()

static int save_owner ( adns_query  qu, const char *  owner, int  ol  )

static

Definition at line 190 of file query.c.

                                                                {
  /* Returns 1 if OK, otherwise there was no memory. */
  adns_answer *ans;
 
  ans= qu->answer;
  assert(!ans->owner);
 
  ans->owner= adns__alloc_preserved(qu, (size_t) ol+1);  if (!ans->owner) return 0;
 
  memcpy(ans->owner,owner, (size_t) ol);
  ans->owner[ol]= 0;
  return 1;
}

Referenced by adns__query_done(), and adns_submit().