* - 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 part of adns, which is Copyright (C) 1997-1999 Ian Jackson
*
* 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
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
-#include <string.h>
#include <sys/time.h>
#include "internal.h"
-int adns__internal_submit(adns_state ads, adns_query *query_r,
- const typeinfo *typei, 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;
-
- qu= malloc(sizeof(*qu)); if (!qu) goto x_nomemory;
- qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) goto x_freequ_nomemory;
-
+
+ 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_udp;
+ qu->state= query_tosend;
qu->back= qu->next= qu->parent= 0;
LIST_INIT(qu->children);
- qu->siblings.next= qu->siblings.back= 0;
+ 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;
-
- 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->udpretries= 0;
qu->udpnextserver= 0;
qu->udpsent= qu->tcpfailed= 0;
timerclear(&qu->timeout);
- memcpy(&qu->ctx,ctx,sizeof(qu->ctx));
+ qu->expires= now.tv_sec + MAXTTLBELIEVE;
+
+ 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;
-
- *query_r= qu;
- qu->query_dglen= qumsg_vb->used;
- if (qumsg_vb->used) {
- qu->query_dgram= malloc(qumsg_vb->used);
- if (!qu->query_dgram) {
- adns__query_fail(qu,adns_s_nomemory);
- return adns_s_ok;
- }
- memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used);
- } else {
- qu->query_dgram= 0;
- }
+ 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.
+ */
+
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; }
- if (failstat) {
- adns__query_fail(qu,failstat);
- return adns_s_ok;
- }
- adns__query_udp(qu,now);
+ 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__autosys(ads,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;
+}
- x_freequ_nomemory:
- free(qu);
- x_nomemory:
- adns__vbuf_free(qumsg_vb);
- return adns_s_nomemory;
+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;
+
+ adns__vbuf_init(&vb);
+
+ 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++];
+ }
+ }
+
+ 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;
+ }
+ }
+
+ 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,
adns_queryflags flags,
void *context,
adns_query *query_r) {
- qcontext ctx;
- int id, r, ol;
- vbuf vb;
+ 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 adns_s_unknownrrtype;
-
- ctx.ext= context;
- ctx.callback= 0;
- memset(&ctx.info,0,sizeof(ctx.info));
+ 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;
- r= gettimeofday(&now,0); if (r) return errno;
- id= 0;
+ qu->ctx.ext= context;
+ qu->ctx.callback= 0;
+ memset(&qu->ctx.info,0,sizeof(qu->ctx.info));
- adns__vbuf_init(&vb);
+ *query_r= qu;
ol= strlen(owner);
- if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; 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;
+ ol--;
+ }
- stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags);
-
- xit:
- return adns__internal_submit(ads,query_r, typei,&vb,id, flags,now, stat,&ctx);
+ 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__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_synchronous(adns_state ads,
}
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) {
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) {
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) {
}
void adns_cancel(adns_query qu) {
+ adns_state ads;
+
+ ads= qu->ads;
+ adns__consistency(ads,qu,cc_entex);
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();
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) {
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->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);
}
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);
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);
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);
}
~ianmdlvl / adns.git / blobdiff