* - 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>
qu->back= qu->next= qu->parent= 0;
LIST_INIT(qu->children);
qu->siblings.next= qu->siblings.back= 0;
- qu->allocations= 0;
+ LIST_INIT(qu->allocations);
qu->interim_allocd= 0;
qu->final_allocspace= 0;
qu->udpnextserver= 0;
qu->udpsent= qu->tcpfailed= 0;
timerclear(&qu->timeout);
- memcpy(&qu->context,ctx,sizeof(qu->context));
+ memcpy(&qu->ctx,ctx,sizeof(qu->ctx));
+ qu->expires= now.tv_sec + MAXTTLBELIEVE;
qu->answer->status= adns_s_ok;
qu->answer->cname= 0;
if (qumsg_vb->used) {
qu->query_dgram= malloc(qumsg_vb->used);
if (!qu->query_dgram) {
- adns__query_fail(qu,adns_s_nolocalmem);
+ adns__query_fail(qu,adns_s_nomemory);
return adns_s_ok;
}
memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used);
free(qu);
x_nomemory:
adns__vbuf_free(qumsg_vb);
- return adns_s_nolocalmem;
+ return adns_s_nomemory;
}
int adns_submit(adns_state ads,
struct timeval now;
typei= adns__findtype(type);
- if (!typei) return adns_s_notimplemented;
+ if (!typei) return adns_s_unknownrrtype;
ctx.ext= context;
+ ctx.callback= 0;
+ memset(&ctx.info,0,sizeof(ctx.info));
+
r= gettimeofday(&now,0); if (r) return errno;
id= 0;
adns__vbuf_init(&vb);
ol= strlen(owner);
- if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_invaliddomain; goto xit; }
+ if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto xit; }
if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_qf_search; ol--; }
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);
+ r= adns_wait(ads,&qu,answer_r,0);
if (r) adns_cancel(qu);
- return r;
-}
-void adns_cancel(adns_query query) {
- abort(); /* fixme */
+ return r;
}
-void *adns__alloc_interim(adns_query qu, size_t sz) {
+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);
- sz= MEM_ROUND(sz);
an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
- if (!an) {
- adns__query_fail(qu,adns_s_nolocalmem);
- return 0;
- }
- qu->interim_allocd += 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));
}
+void *adns__alloc_interim(adns_query qu, size_t sz) {
+ sz= MEM_ROUND(sz);
+ qu->interim_allocd += sz;
+ return alloc_common(qu,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;
+
+ 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
return rp;
}
+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);
+ }
+ LIST_INIT(qu->children);
+}
+
void adns__reset_cnameonly(adns_query qu) {
- assert(qu->final_allocspace);
+ 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;
}
-void adns__query_done(adns_query qu) {
- adns_answer *ans;
+static void free_query_allocs(adns_query qu) {
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); }
+ adns__vbuf_free(&qu->vb);
+}
+
+void adns_cancel(adns_query qu) {
+ switch (qu->state) {
+ case query_udp: case query_tcpwait: case query_tcpsent:
+ LIST_UNLINK(qu->ads->timew,qu);
+ break;
+ case query_child:
+ LIST_UNLINK(qu->ads->childw,qu);
+ break;
+ case query_done:
+ LIST_UNLINK(qu->ads->output,qu);
+ break;
+ default:
+ abort();
+ }
+ free_query_allocs(qu);
+ free(qu->answer);
+ free(qu);
+}
+
+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);
+
if (ans->nrrs) {
- adns__makefinal_block(qu,&ans->rrs.untyped,ans->rrsz*ans->nrrs);
- for (i=0; i<ans->nrrs; i++)
- qu->typei->makefinal(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->answer->status= adns_s_nomemory;
+ qu->answer->cname= 0;
+ adns__reset_cnameonly(qu);
+ free_query_allocs(qu);
+}
- for (an= qu->allocations; an; an= ann) { ann= an->next; free(an); }
+void adns__query_done(adns_query qu) {
+ adns_answer *ans;
+ adns_query parent;
- adns__vbuf_free(&qu->vb);
-
qu->id= -1;
- LIST_LINK_TAIL(qu->ads->output,qu);
+ ans= qu->answer;
+
+ 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.);
+ qu->ctx.callback(parent,qu);
+ free_query_allocs(qu);
+ free(qu);
+ } else {
+ makefinal_query(qu);
+ LIST_LINK_TAIL(qu->ads->output,qu);
+ }
}
void adns__query_fail(adns_query qu, adns_status stat) {
char *before, *after;
before= *strp;
+ if (!before) return;
l= strlen(before)+1;
after= adns__alloc_final(qu,l);
memcpy(after,before,l);
}
void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
- void *after;
+ void *before, *after;
+ before= *blpp;
+ if (!before) return;
after= adns__alloc_final(qu,sz);
- memcpy(after,*blpp,sz);
+ memcpy(after,before,sz);
*blpp= after;
}
-
~ianmdlvl / adns.git / blobdiff