* - 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) 1997-2000,2003,2006 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
#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_rrtype type,
+ 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;
- qu->allocations= 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= -2; /* will be overwritten with real id before we leave adns */
qu->flags= flags;
- qu->udpretries= 0;
+ qu->retries= 0;
qu->udpnextserver= 0;
- qu->udpsent= qu->tcpfailed= 0;
+ qu->udpsent= 0;
timerclear(&qu->timeout);
- memcpy(&qu->context,ctx,sizeof(qu->context));
+ 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->type= typei->type;
+ qu->answer->cname= qu->answer->owner= 0;
+ qu->answer->type= type;
+ qu->answer->expires= -1;
qu->answer->nrrs= 0;
- qu->answer->rrs= 0;
- qu->answer->rrsz= typei->rrsz;
-
- *query_r= qu;
+ qu->answer->rrs.untyped= 0;
+ qu->answer->rrsz= typei->getrrsz(typei,type);
+
+ 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_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_nolocalmem);
- return adns_s_ok;
- }
- memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used);
- } else {
- qu->query_dgram= 0;
- }
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;
+ qu->id= id;
+ qu->query_dglen= qu->vb.used;
+ memcpy(qu->query_dgram,qu->vb.buf,qu->vb.used);
+
+ typei->query_send(qu,now);
+}
+
+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;
+ }
}
- adns__query_udp(qu,now);
- adns__autosys(ads,now);
+ 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;
+}
- x_freequ_nomemory:
- free(qu);
- x_nomemory:
+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 adns_s_nolocalmem;
+ 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; }
+
+ 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 {
+ 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++];
+ }
+ }
+
+ 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 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;
}
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_notimplemented;
+ 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;
- ctx.ext= context;
- r= gettimeofday(&now,0); if (r) return errno;
- id= 0;
+ 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));
- adns__vbuf_init(&vb);
+ *query_r= qu;
ol= strlen(owner);
- if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_domaintoolong; 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__returning(ads,qu);
+ return 0;
+
+ x_adnsfail:
+ adns__query_fail(qu,stat);
+ adns__returning(ads,qu);
+ return 0;
+
+ 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;
- 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);
+ 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,
assert(!qu->final_allocspace);
an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
if (!an) return 0;
- an->next= qu->allocations;
- qu->allocations= an;
+ 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;
+
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;
+}
+
+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
return rp;
}
-void adns__reset_cnameonly(adns_query qu) {
- /* fixme: cancel children */
+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= 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) {
allocnode *an, *ann;
- adns_query cqu, ncqu;
- for (cqu= qu->children.head; cqu; cqu= ncqu) {
- ncqu= cqu->siblings.next;
- adns_cancel(cqu);
- }
- for (an= qu->allocations; an; an= ann) { ann= an->next; free(an); }
+ 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_cancel(adns_query qu) {
+void adns__returning(adns_state ads, adns_query qu_for_caller) {
+ 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_udp: case query_tcpwait: case query_tcpsent:
- LIST_UNLINK(qu->ads->timew,qu);
+ case query_tosend:
+ LIST_UNLINK(ads->udpw,qu);
+ break;
+ case query_tcpw:
+ LIST_UNLINK(ads->tcpw,qu);
break;
- case query_child:
- LIST_UNLINK(qu->ads->childw,qu);
+ case query_childw:
+ LIST_UNLINK(ads->childw,qu);
break;
case query_done:
- LIST_UNLINK(qu->ads->output,qu);
+ LIST_UNLINK(ads->output,qu);
break;
default:
abort();
free(qu->answer);
free(qu);
}
-
-void adns__query_done(adns_query qu) {
+
+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 (qu->interim_allocd) {
- if (qu->answer->nrrs && qu->typei->diff_needswap) {
- if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
- adns__query_fail(qu,adns_s_nolocalmem);
- return;
- }
- }
- ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
- if (!ans) {
- qu->answer->cname= 0;
- adns__query_fail(qu, adns_s_nolocalmem);
- return;
- }
+ 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, ans->nrrs*ans->rrsz);
for (rrn=0; rrn<ans->nrrs; rrn++)
qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz);
-
- if (qu->typei->diff_needswap)
- adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
- qu->vb.buf, qu->typei->diff_needswap);
}
-
+
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_answer *ans;
+ adns_query parent;
+
+ adns__cancel_children(qu);
+
qu->id= -1;
- LIST_LINK_TAIL(qu->ads->output,qu);
+ ans= qu->answer;
- assert(!qu->parent);
- /* fixme: do something with the answers to internally-generated queries. */
+ 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;
+ 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_query qu, adns_status stat) {
- adns__reset_cnameonly(qu);
+ adns__reset_preserved(qu);
qu->answer->status= stat;
adns__query_done(qu);
}
~mdw / adns / blobdiff