* -quotefail-cname
* -cname-loose
* -cname-forbid
+ * -reverse
+ * -reverse-any ZONE-A-LIKE
*
* adns new-resolver [RES-OPTIONS...] => RESOLVER
* options:
* -noenv|-debug|-logpid
* -checkc-entex
* -checkc-freq
- * -reverse
- * -reverse-any ZONE-A-LIKE
* -config CONFIG-STRING
*
+ * adns set-default-resolver RESOLVER
+ * cancels any outstanding queries from a previous anonymous
+ * default resolver
+ *
* adns destroy-resolver RESOLVER
+ * cancels outstanding queries
*/
+#define _GNU_SOURCE
+
+#include <stdio.h>
+
#include "tables.h"
#include "hbytes.h"
typedef struct Query Query;
typedef struct Resolver Resolver;
typedef struct OptionInfo OptionInfo;
-static void asynch_check(Resolver *res);
-static void asynch_sethandlers(Resolver *res, int shutdown);
+
+static void asynch_sethandlers(Resolver *res);
+static void asynch_cancelhandlers(Resolver *res);
+static void asynch_perturbed(Resolver *res);
+
static void asynch_query_dispose(Tcl_Interp *interp, Query *query);
+#define ASSOC_DEFAULTRES "adns-defaultresolver"
+
/*---------- common resolver/query option processing ----------*/
typedef struct {
};
enum {
- oisf_makedefault= 0x0001,
oisf_reverse= 0x0002
};
#define OIFS(f) { "-" #f, oifn_fs, 0, oisf_##f, 0 }
#define OICA(o) { "-" #o, oifn_##o, 1 }
+static void optparse_blank(OptionParse *op) {
+ memset(op,0,sizeof(*op));
+ op->errfile= stderr;
+ op->errcallback= 0;
+ op->config_string= 0;
+}
+
static int parse_options(Tcl_Interp *ip, int objc, Tcl_Obj *const *objv,
const OptionInfo opttable[], OptionParse *op) {
const OptionInfo *oi;
Tcl_TimerToken timertoken;
int maxfd;
fd_set handling[3];
+ ScriptToInvoke errcallback;
+ Tcl_Obj *errstring_accum;
};
+/* The default resolver is recorded using Tcl_SetAssocData with key
+ * ASSOC_DEFAULTRES to record the Resolver*. If it was explicitly
+ * created with `adns new-resolver' then ix will be >=0, and the
+ * resolver will be destroyed - leaving no default - when explicitly
+ * requested. If it was implicitly created (by starting a query when
+ * there is no default) then ix will be -1. */
+
static int oifn_errfile(Tcl_Interp *ip, const OptionInfo *oi,
Tcl_Obj *arg, OptionParse *op) {
int rc;
OIFA1(if,noerrprint, adns_if_debug),
OIFA2(if,checkc,entex),
OIFA2(if,checkc,freq),
- OIFS(makedefault),
OICA(errfile),
OICA(errcallback),
OICA(config),
{ 0 }
};
+static void adnslogfn_flushmessage(Resolver *res) {
+ scriptinv_invoke(&res->errcallback, 1, &res->errstring_accum);
+ Tcl_SetObjLength(res->errstring_accum, 0);
+}
+
static void adnslogfn_callback(adns_state ads, void *logfndata,
const char *fmt, va_list al) {
- abort(); /* fixme implement adns_logcallbackfn */
+ Resolver *res= logfndata;
+ int l, newline;
+ char *str;
+
+ l= vasprintf(&str,fmt,al);
+ if (l<0) {
+ posixerr(res->interp,errno,"construct adns log callback string");
+ Tcl_BackgroundError(res->interp);
+ }
+
+ if (l==0) { free(str); return; }
+ if ((newline= l>0 && str[l-1]=='\n')) l--;
+
+ if (!res->errstring_accum) {
+ res->errstring_accum= Tcl_NewStringObj(str,l);
+ Tcl_IncrRefCount(res->errstring_accum);
+ } else {
+ Tcl_AppendToObj(res->errstring_accum,str,l);
+ }
+ free(str);
+
+ if (newline)
+ adnslogfn_flushmessage(res);
+}
+
+static Resolver *default_resolver(Tcl_Interp *ip) {
+ return Tcl_GetAssocData(ip,ASSOC_DEFAULTRES,0);
}
static void destroy_resolver(Tcl_Interp *ip, Resolver *res) {
void *query_v;
+ int logstring_len;
+ char *rstr;
adns_query aqu;
-
+
+ if (res == default_resolver(ip))
+ Tcl_DeleteAssocData(ip,ASSOC_DEFAULTRES);
+
+ if (res->errstring_accum) {
+ rstr= Tcl_GetStringFromObj(res->errstring_accum, &logstring_len);
+ assert(rstr);
+ if (logstring_len)
+ adnslogfn_flushmessage(res);
+ }
+
if (res->ads) {
/* although adns would throw these away for us, we need to
* destroy our own data too and only adns has a list of them */
asynch_query_dispose(ip, query_v);
}
adns_finish(res->ads);
+ res->ads= 0;
}
- asynch_sethandlers(res,1);
- TFREE(res);
- /* fixme what about the default resolver */
+ asynch_cancelhandlers(res);
+ scriptinv_cancel(&res->errcallback);
+ Tcl_EventuallyFree(res, Tcl_Free);
}
static void destroy_resolver_idtabcb(Tcl_Interp *ip, void *resolver_v) {
destroy_resolver(ip,resolver_v);
}
+static void destroy_resolver_defcb(ClientData resolver_v, Tcl_Interp *ip) {
+ destroy_resolver(ip,resolver_v);
+}
int do_adns_destroy_resolver(ClientData cd, Tcl_Interp *ip, void *res_v) {
- destroy_resolver(ip,res_v);
tabledataid_disposing(ip,res_v,&adnstcl_resolvers);
+ destroy_resolver(ip,res_v);
return TCL_OK;
}
-int do_adns_new_resolver(ClientData cd, Tcl_Interp *ip,
- int objc, Tcl_Obj *const *objv,
- void **result) {
- OptionParse op;
+static int create_resolver(Tcl_Interp *ip, const OptionParse *op,
+ Resolver **res_r) {
Resolver *res=0;
int rc, i, ec;
-
- op.aflags= adns_if_noautosys;
- op.sflags= 0;
- op.errfile= 0;
- op.errcallback= 0;
- op.config_string= 0;
- rc= parse_options(ip,objc,objv,resolver_optioninfos,&op);
- if (rc) goto x_rc;
-
- res= TALLOC(sizeof(*res)); assert(res);
+
+ res= TALLOC(sizeof(*res)); assert(res);
res->ix= -1;
res->interp= ip;
res->ads= 0;
res->timertoken= 0;
res->maxfd= 0;
for (i=0; i<3; i++) FD_ZERO(&res->handling[i]);
+ scriptinv_init(&res->errcallback);
+ res->errstring_accum= 0;
- if (op.aflags & adns_if_noerrprint) {
- op.errfile= 0;
- op.errcallback= 0;
- }
+ if (op->errcallback)
+ scriptinv_set(&res->errcallback, ip, op->errcallback, 0);
- ec= adns_init_logfn(&res->ads, op.aflags, op.config_string,
- op.errcallback ? adnslogfn_callback : 0,
- op.errcallback ? (void*)op.errcallback
- : (void*)op.errfile);
+ ec= adns_init_logfn(&res->ads,
+ op->aflags | adns_if_noautosys,
+ op->config_string,
+ op->errcallback ? adnslogfn_callback : 0,
+ op->errcallback ? (void*)res : (void*)op->errfile);
if (ec) { rc= posixerr(ip,ec,"create adns resolver"); goto x_rc; }
- if (op.errcallback)
- Tcl_IncrRefCount(op.errcallback);
-
- *result= res;
+ *res_r= res;
return TCL_OK;
x_rc:
TFREE(res);
}
return rc;
+}
+
+int do_adns_new_resolver(ClientData cd, Tcl_Interp *ip,
+ int objc, Tcl_Obj *const *objv,
+ void **result) {
+ OptionParse op;
+ Resolver *res=0;
+ int rc;
+
+ optparse_blank(&op);
+ rc= parse_options(ip,objc,objv,resolver_optioninfos,&op);
+ if (rc) return rc;
+
+ if (op.aflags & adns_if_noerrprint) {
+ op.errfile= 0;
+ op.errcallback= 0;
+ }
+
+ rc= create_resolver(ip, &op, &res);
+ if (rc) return rc;
+
+ *result= res;
+ return TCL_OK;
+}
+
+int do_adns_set_default_resolver(ClientData cd, Tcl_Interp *ip, void *res_v) {
+ Resolver *res= res_v;
+ Tcl_DeleteAssocData(ip,ASSOC_DEFAULTRES);
+ Tcl_SetAssocData(ip, ASSOC_DEFAULTRES, 0, res);
+ return TCL_OK;
}
const IdDataSpec adnstcl_resolvers= {
static int query_submit(Tcl_Interp *ip,
const AdnsTclRRTypeInfo *type, const char *domain,
int queryopts_objc, Tcl_Obj *const *queryopts_objv,
- adns_query *aqu_r, void *context, OptionParse *op) {
+ adns_query *aqu_r, void *context, Resolver **res_r) {
struct sockaddr sa;
static const int aftry[]= { AF_INET, AF_INET6 };
+ OptionParse op;
+ OptionParse res_op;
int rc, r, ec;
adns_state ads;
- op->aflags= adns_qf_owner;
- op->sflags= 0;
- op->resolver= 0; /* fixme default */
- op->reverseany= 0;
- rc= parse_options(ip, queryopts_objc,queryopts_objv, query_optioninfos,op);
+ op.aflags= adns_qf_owner;
+ op.sflags= 0;
+ op.resolver= 0;
+ op.reverseany= 0;
+ rc= parse_options(ip, queryopts_objc,queryopts_objv, query_optioninfos,&op);
if (rc) return rc;
- if (op->reverseany || (op->sflags & oisf_reverse)) {
+ if (!op.resolver) {
+ op.resolver= default_resolver(ip);
+ if (!op.resolver) {
+ optparse_blank(&res_op);
+ rc= create_resolver(ip, &res_op, &op.resolver);
+ if (rc) return rc;
+
+ Tcl_SetAssocData(ip, ASSOC_DEFAULTRES,
+ destroy_resolver_defcb, op.resolver);
+ }
+ }
+
+ *res_r= op.resolver;
+
+ if (op.reverseany || (op.sflags & oisf_reverse)) {
const int *af;
for (af=aftry; af < af + sizeof(af)/sizeof(*af); af++) {
memset(&sa,0,sizeof(sa));
af_found:;
}
- ads= op->resolver->ads;
+ ads= op.resolver->ads;
- if (op->reverseany) {
- ec= adns_submit_reverse_any(ads, &sa, op->reverseany,
- type->number, op->aflags, context, aqu_r);
- } else if (op->sflags & oisf_reverse) {
+ if (op.reverseany) {
+ ec= adns_submit_reverse_any(ads, &sa, op.reverseany,
+ type->number, op.aflags, context, aqu_r);
+ } else if (op.sflags & oisf_reverse) {
ec= adns_submit_reverse(ads, &sa,
- type->number, op->aflags, context, aqu_r);
+ type->number, op.aflags, context, aqu_r);
} else {
ec= adns_submit(ads, domain,
- type->number, op->aflags, context, aqu_r);
+ type->number, op.aflags, context, aqu_r);
}
if (ec)
return posixerr(ip,ec,"submit adns query");
const char *domain,
int objc, Tcl_Obj *const *objv, adns_answer **answer_r) {
adns_query aqu;
- OptionParse op;
Resolver *res;
int rc, ec;
- rc= query_submit(ip,rrtype,domain,objc,objv,&aqu,0,&op);
+ rc= query_submit(ip,rrtype,domain,objc,objv,&aqu,0,&res);
if (rc) return rc;
- res= op.resolver;
ec= adns_wait(res->ads,&aqu,answer_r,0);
assert(!ec);
- asynch_check(res);
+ asynch_perturbed(res);
return TCL_OK;
}
Tcl_Obj *xargs;
};
+static void asynch_check_now(Resolver *res);
+
static void asynch_timerhandler(void *res_v) {
Resolver *res= res_v;
res->timertoken= 0;
adns_processtimeouts(res->ads,0);
- asynch_check(res);
+ asynch_check_now(res);
}
static void asynch_filehandler(void *res_v, int mask) {
ec= adns_processany(res->ads);
if (ec) adns_globalsystemfailure(res->ads);
- asynch_check(res);
+ asynch_check_now(res);
}
-static void asynch_sethandlers(Resolver *res, int shutdown) {
+static void asynch_sethandlers_generic(Resolver *res,
+ int shutdown /*from _cancelhandlers*/,
+ int immediate /*from _perturbed*/) {
fd_set want[3];
int maxfd;
struct timeval tv_buf, *timeout;
if (FD_ISSET(fd, &want[0])) mask |= TCL_READABLE;
if (FD_ISSET(fd, &want[1])) mask |= TCL_WRITABLE;
if (FD_ISSET(fd, &want[2])) mask |= TCL_EXCEPTION;
- if (mask) Tcl_CreateFileHandler(fd,mask,asynch_filehandler,res);
- else Tcl_DeleteFileHandler(fd);
+ if (mask) {
+ Tcl_CreateFileHandler(fd,mask,asynch_filehandler,res);
+ FD_SET(fd, &res->handling[i]);
+ } else {
+ Tcl_DeleteFileHandler(fd);
+ FD_CLR(fd, &res->handling[i]);
+ }
}
+ res->maxfd= maxfd;
Tcl_DeleteTimerHandler(res->timertoken);
- if (timeout) {
+ if (immediate) {
+ res->timertoken= Tcl_CreateTimerHandler(0,asynch_timerhandler,res);
+ } else if (timeout) {
int milliseconds;
if (timeout->tv_sec >= INT_MAX/1000 - 1)
}
}
-static void asynch_check(Resolver *res) {
+static void asynch_sethandlers(Resolver *res) {
+ asynch_sethandlers_generic(res,0,0);
+}
+static void asynch_cancelhandlers(Resolver *res) {
+ asynch_sethandlers_generic(res,1,0);
+}
+static void asynch_perturbed(Resolver *res) {
+ asynch_sethandlers_generic(res,0,1);
+}
+
+static void asynch_check_now(Resolver *res) {
Tcl_Interp *interp= res->interp;
adns_query aqu;
adns_answer *answer;
int ec;
Tcl_Obj *results[RESULTLIST_LLEN];
+ Tcl_Preserve(res);
+
for (;;) {
+ if (!res->ads) { /* oh, it has been destroyed! */
+ Tcl_Release(res);
+ return;
+ }
+
aqu= 0;
ec= adns_check(res->ads, &aqu, &answer, &query_v);
if (ec==ESRCH || ec==EAGAIN) break;
asynch_query_dispose(interp, query);
}
- asynch_sethandlers(res,0);
+ asynch_sethandlers(res);
+
+ Tcl_Release(res);
}
int do_adns_asynch(ClientData cd, Tcl_Interp *ip,
int objc, Tcl_Obj *const *objv, void **result) {
Query *query;
int rc;
- Resolver *res=0;
- OptionParse op;
+ Resolver *res= 0;
query= TALLOC(sizeof(*query));
query->ix= -1;
scriptinv_init(&query->on_fail);
query->xargs= 0;
- rc= query_submit(ip,rrtype,domain,objc,objv,&query->aqu,query,&op);
+ rc= query_submit(ip,rrtype,domain,objc,objv,&query->aqu,query,&query->res);
if (rc) goto x_rc;
- res= op.resolver;
+ res= query->res;
- rc= scriptinv_set(&query->on_yes, ip,on_yes); if (rc) goto x_rc;
- rc= scriptinv_set(&query->on_no, ip,on_no); if (rc) goto x_rc;
- rc= scriptinv_set(&query->on_fail,ip,on_fail); if (rc) goto x_rc;
+ rc= scriptinv_set(&query->on_yes, ip,on_yes, xargs); if (rc) goto x_rc;
+ rc= scriptinv_set(&query->on_no, ip,on_no, xargs); if (rc) goto x_rc;
+ rc= scriptinv_set(&query->on_fail,ip,on_fail,xargs); if (rc) goto x_rc;
query->xargs= xargs;
Tcl_IncrRefCount(xargs);
*result= query;
x_rc:
if (query) asynch_query_dispose(ip, query);
- if (res) asynch_sethandlers(res,0);
+ if (res) asynch_perturbed(res);
return rc;
}
Query *query= query_v;
Resolver *res= query->res;
asynch_query_dispose(ip, query);
- asynch_sethandlers(res,0);
+ asynch_perturbed(res);
return TCL_OK;
}
~ian / chiark-tcl.git / blobdiff