-/**/
+/*
+ * query.c
+ * - overall query management (allocation, completion)
+ * - per-query memory management
+ * - query submission and cancellation (user-visible and internal)
+ */
+/*
+ * 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
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#include "internal.h"
+
+#include <stdlib.h>
+#include <unistd.h>
#include <errno.h>
-#include <string.h>
-#include <sys/uio.h>
+#include <sys/time.h>
#include "internal.h"
-adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
- adns_rrtype type, adns_queryflags flags) {
- /* Assembles a query packet in ads->rqbuf. */
- int ll, c, nlabs;
- byte label[255], *rqp;
- const char *p, *pe;
-
-#define MKQUERY_ADDB(b) *rqp++= (b)
-#define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))
-
- if (!adns__vbuf_ensure(&ads->rqbuf,12+strlen(owner)+3)) return adns_s_nolocalmem;
- rqp= ads->rqbuf.buf;
-
- MKQUERY_ADDW(id);
- MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
- MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
- MKQUERY_ADDW(1); /* QDCOUNT=1 */
- MKQUERY_ADDW(0); /* ANCOUNT=0 */
- MKQUERY_ADDW(0); /* NSCOUNT=0 */
- MKQUERY_ADDW(0); /* ARCOUNT=0 */
- p= owner; pe= owner+ol;
- nlabs= 0;
- if (!*p) return adns_s_invaliddomain;
- do {
- ll= 0;
- while (p!=pe && (c= *p++)!='.') {
- if (c=='\\') {
- if (!(flags & adns_qf_anyquote)) return adns_s_invaliddomain;
- if (ctype_digit(p[0])) {
- if (ctype_digit(p[1]) && ctype_digit(p[2])) {
- c= (*p++ - '0')*100 + (*p++ - '0')*10 + (*p++ - '0');
- if (c >= 256) return adns_s_invaliddomain;
- } else {
- return adns_s_invaliddomain;
- }
- } else if (!(c= *p++)) {
- return adns_s_invaliddomain;
- }
- }
- if (!(flags & adns_qf_anyquote)) {
- if (ctype_digit(c) || c == '-') {
- if (!ll) return adns_s_invaliddomain;
- } else if ((c < 'a' || c > 'z') && (c < 'A' && c > 'Z')) {
- return adns_s_invaliddomain;
- }
- }
- if (ll == sizeof(label)) return adns_s_invaliddomain;
- label[ll++]= c;
- }
- if (!ll) return adns_s_invaliddomain;
- if (nlabs++ > 63) return adns_s_invaliddomain;
- MKQUERY_ADDB(ll);
- memcpy(rqp,label,ll); rqp+= ll;
- } while (p!=pe);
-
- MKQUERY_ADDB(0);
- MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
- MKQUERY_ADDW(1); /* QCLASS=IN */
-
- ads->rqbuf.used= rqp - ads->rqbuf.buf;
- assert(ads->rqbuf.used < ads->rqbuf.avail);
+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;
- return adns_s_ok;
+ 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= type;
+ qu->answer->expires= -1;
+ qu->answer->nrrs= 0;
+ qu->answer->rrs.untyped= 0;
+ qu->answer->rrsz= typei->getrrsz(typei,type);
+
+ return qu;
}
-void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now) {
- /* Query must be in state tcpwait/timew; it will be moved to a new state
- * if possible and no further processing can be done on it for now.
- * (Resulting state is one of tcpwait/timew (if server not connected),
- * tcpsent/timew, child/childw or done/output.)
- *
- * adns__tcp_tryconnect should already have been called - _tcp
- * will only use an existing connection (if there is one), which it
- * may break. If the conn list lost then the caller is responsible for any
- * reestablishment and retry.
+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.
*/
- byte length[2];
- struct iovec iov[2];
- int wr, r;
- if (ads->tcpstate != server_ok) return;
+ qu->vb= *qumsg_vb;
+ adns__vbuf_init(qumsg_vb);
- length[0]= (qu->querylen&0x0ff00U) >>8;
- length[1]= (qu->querylen&0x0ff);
+ qu->query_dgram= malloc(qu->vb.used);
+ if (!qu->query_dgram) { adns__query_fail(qu,adns_s_nomemory); return; }
- if (!adns__vbuf_ensure(&ads->tcpsend,ads->tcpsend.used+qu->querylen+2)) return;
+ qu->id= id;
+ qu->query_dglen= qu->vb.used;
+ memcpy(qu->query_dgram,qu->vb.buf,qu->vb.used);
- timevaladd(&now,TCPMS);
- qu->timeout= now;
- qu->state= query_tcpsent;
- LIST_LINK_TAIL(ads->timew,qu);
+ typei->query_send(qu,now);
+}
- if (ads->tcpsend.used) {
- wr= 0;
- } else {
- iov[0].iov_base= length;
- iov[0].iov_len= 2;
- iov[1].iov_base= qu->querymsg;
- iov[1].iov_len= qu->querylen;
- wr= writev(ads->tcpsocket,iov,2);
- if (wr < 0) {
- if (!(errno == EAGAIN || errno == EINTR || errno == ENOSPC ||
- errno == ENOBUFS || errno == ENOMEM)) {
- adns__tcp_broken(ads,"write",strerror(errno));
- return;
- }
- wr= 0;
+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,
+ adns_query parent,
+ const typeinfo *typei, adns_rrtype type,
+ vbuf *qumsg_vb, int id,
+ adns_queryflags flags, struct timeval now,
+ qcontext *ctx) {
+ adns_query qu;
+ adns_status err;
+
+ 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;
+
+ qu->parent= parent;
+ LIST_LINK_TAIL_PART(parent->children,qu,siblings.);
+ 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_new;
+ int id;
+ adns_status stat;
+
+ 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; }
- if (wr<2) {
- r= adns__vbuf_append(&ads->tcpsend,length,2-wr); assert(r);
- wr= 0;
+ 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) {
+ const char *nextentry;
+ adns_status stat;
+
+ if (qu->search_doneabs<0) {
+ nextentry= 0;
+ qu->search_doneabs= 1;
} else {
- wr-= 2;
+ if (qu->search_pos >= ads->nsearchlist) {
+ if (qu->search_doneabs) {
+ qu->search_vb.used= qu->search_origlen;
+ stat= adns_s_nxdomain; goto x_fail;
+ } else {
+ nextentry= 0;
+ qu->search_doneabs= 1;
+ }
+ } else {
+ nextentry= ads->searchlist[qu->search_pos++];
+ }
}
- if (wr<qu->querylen) {
- r= adns__vbuf_append(&ads->tcpsend,qu->querymsg+wr,qu->querylen-wr); assert(r);
+
+ qu->search_vb.used= qu->search_origlen;
+ if (nextentry) {
+ if (!adns__vbuf_append(&qu->search_vb,".",1) ||
+ !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);
+ return;
+
+x_nomemory:
+ stat= adns_s_nomemory;
+x_fail:
+ adns__query_fail(qu,stat);
}
-static void query_usetcp(adns_state ads, adns_query qu, struct timeval now) {
- timevaladd(&now,TCPMS);
- qu->timeout= now;
- qu->state= query_tcpwait;
- LIST_LINK_TAIL(ads->timew,qu);
- adns__query_tcp(ads,qu,now);
- adns__tcp_tryconnect(ads,now);
+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_preserved(qu,ol+1); if (!ans->owner) return 0;
+
+ memcpy(ans->owner,owner,ol);
+ ans->owner[ol]= 0;
+ return 1;
}
-void adns__query_udp(adns_state ads, adns_query qu, struct timeval now) {
- /* Query must be in state udp/NONE; it will be moved to a new state,
- * and no further processing can be done on it for now.
- * (Resulting state is one of udp/timew, tcpwait/timew (if server not connected),
- * tcpsent/timew, child/childw or done/output.)
- */
- struct sockaddr_in servaddr;
- int serv, r;
+int adns_submit(adns_state ads,
+ const char *owner,
+ adns_rrtype type,
+ adns_queryflags flags,
+ void *context,
+ adns_query *query_r) {
+ 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,type,flags,now); if (!qu) goto x_errno;
+
+ qu->ctx.ext= context;
+ qu->ctx.callback= 0;
+ memset(&qu->ctx.pinfo,0,sizeof(qu->ctx.pinfo));
+ memset(&qu->ctx.tinfo,0,sizeof(qu->ctx.tinfo));
- assert(qu->state == query_udp);
- if ((qu->flags & adns_qf_usevc) || (qu->querylen > MAXUDPDGRAM)) {
- query_usetcp(ads,qu,now);
- return;
+ *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 (qu->udpretries >= MAXUDPRETRIES) {
- adns__query_fail(ads,qu,adns_s_timeout);
- return;
+ 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__returning(ads,qu);
+ return 0;
+
+ x_adnsfail:
+ adns__query_fail(qu,stat);
+ adns__returning(ads,qu);
+ return 0;
- serv= qu->udpnextserver;
- memset(&servaddr,0,sizeof(servaddr));
- servaddr.sin_family= AF_INET;
- servaddr.sin_addr= ads->servers[serv].addr;
- servaddr.sin_port= htons(NSPORT);
+ x_errno:
+ r= errno;
+ assert(r);
+ adns__returning(ads,0);
+ 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,
+ adns_queryflags flags,
+ adns_answer **answer_r) {
+ adns_query qu;
+ int r;
- r= sendto(ads->udpsocket,qu->querymsg,qu->querylen,0,&servaddr,sizeof(servaddr));
- if (r<0 && errno == EMSGSIZE) { query_usetcp(ads,qu,now); return; }
- if (r<0) adns__warn(ads,serv,"sendto failed: %s",strerror(errno));
+ 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;
+}
+
+static void *alloc_common(adns_query qu, size_t sz) {
+ 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);
+ an->sz= sz;
+ return (byte*)an + MEM_ROUND(sizeof(*an));
+}
+
+void *adns__alloc_interim(adns_query qu, size_t sz) {
+ void *rv;
- timevaladd(&now,UDPRETRYMS);
- qu->timeout= now;
- qu->udpsent |= (1<<serv);
- qu->udpnextserver= (serv+1)%ads->nservers;
- qu->udpretries++;
- LIST_LINK_TAIL(ads->timew,qu);
+ sz= MEM_ROUND(sz);
+ rv= alloc_common(qu,sz);
+ if (!rv) return 0;
+ qu->interim_allocd += sz;
+ return rv;
}
-void adns__query_nomem(adns_state ads, adns_query qu) {
- qu->answer.used= 0;
- qu->id= -1;
- LIST_LINK_TAIL(ads->output,qu);
+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= alloc_info(from, block, &sz);
+
+ if (!an) return;
+
+ 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
+ * 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;
+}
+
+void adns__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);
+ adns__cancel_children(qu);
+ qu->answer->nrrs= 0;
+ qu->answer->rrs.untyped= 0;
+ qu->interim_allocd= qu->preserved_allocd;
+}
+
+static void free_query_allocs(adns_query qu) {
+ allocnode *an, *ann;
+
+ adns__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__returning(adns_state ads, adns_query qu_for_caller) {
+ while (ads->intdone.head) {
+ adns_query iq= ads->intdone.head;
+ adns_query parent= iq->parent;
+ LIST_UNLINK_PART(parent->children,iq,siblings.);
+ LIST_UNLINK(iq->ads->childw,parent);
+ LIST_UNLINK(ads->intdone,iq);
+ iq->ctx.callback(parent,iq);
+ free_query_allocs(iq);
+ free(iq->answer);
+ free(iq);
+ }
+ adns__consistency(ads,qu_for_caller,cc_entex);
+}
+
+void adns__cancel(adns_query qu) {
+ adns_state ads;
+
+ ads= qu->ads;
+ adns__consistency(ads,qu,cc_freq);
+ 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:
+ if (qu->parent)
+ LIST_UNLINK(ads->intdone,qu);
+ else
+ LIST_UNLINK(ads->output,qu);
+ break;
+ default:
+ abort();
+ }
+ free_query_allocs(qu);
+ free(qu->answer);
+ free(qu);
}
-void adns__query_fail(adns_state ads, adns_query qu, adns_status stat) {
+void adns_cancel(adns_query qu) {
+ adns_state ads;
+
+ assert(!qu->parent);
+ ads= qu->ads;
+ adns__consistency(ads,qu,cc_entex);
+ adns__cancel(qu);
+ adns__returning(ads,0);
+}
+
+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 (!adns__vbuf_ensure(&qu->answer,sizeof(adns_answer))) {
- adns__query_nomem(ads,qu);
- return;
+ 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;
}
- ans= (adns_answer*)qu->answer.buf;
- ans->status= stat;
- ans->cname= 0;
- ans->type= qu->type;
- ans->nrrs= 0;
- qu->answer.used= sizeof(adns_answer);
+
+ 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);
+ }
+
+ 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_state ads=qu->ads;
+ adns_answer *ans;
+
+ adns__cancel_children(qu);
+
qu->id= -1;
- LIST_LINK_TAIL(ads->output,qu);
+ ans= qu->answer;
+
+ 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;
+ }
+ }
+
+ if (ans->nrrs && qu->typei->diff_needswap) {
+ 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,
+ 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;
+ qu->state= query_done;
+ if (qu->parent) {
+ LIST_LINK_TAIL(ads->intdone,qu);
+ } else {
+ makefinal_query(qu);
+ LIST_LINK_TAIL(qu->ads->output,qu);
+ }
+}
+
+void adns__query_fail(adns_query qu, adns_status stat) {
+ adns__reset_preserved(qu);
+ qu->answer->status= stat;
+ adns__query_done(qu);
+}
+
+void adns__makefinal_str(adns_query qu, char **strp) {
+ int l;
+ char *before, *after;
+
+ before= *strp;
+ if (!before) return;
+ 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 *before, *after;
+
+ before= *blpp;
+ if (!before) return;
+ after= adns__alloc_final(qu,sz);
+ memcpy(after,before,sz);
+ *blpp= after;
}
~ianmdlvl / adns.git / blobdiff