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-rw-r--r--lib/samples/sample-async.c403
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diff --git a/lib/samples/sample-async.c b/lib/samples/sample-async.c
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+++ b/lib/samples/sample-async.c
@@ -0,0 +1,403 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include <config.h>
+
+#ifndef WIN32
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <arpa/inet.h>
+
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <isc/app.h>
+#include <isc/buffer.h>
+#include <isc/commandline.h>
+#include <isc/lib.h>
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/socket.h>
+#include <isc/sockaddr.h>
+#include <isc/task.h>
+#include <isc/timer.h>
+#include <isc/util.h>
+
+#include <dns/client.h>
+#include <dns/fixedname.h>
+#include <dns/lib.h>
+#include <dns/name.h>
+#include <dns/rdataset.h>
+#include <dns/rdatatype.h>
+#include <dns/result.h>
+
+#define MAX_SERVERS 10
+#define MAX_QUERIES 100
+
+static dns_client_t *client = NULL;
+static isc_task_t *query_task = NULL;
+static isc_appctx_t *query_actx = NULL;
+static unsigned int outstanding_queries = 0;
+static const char *def_server = "127.0.0.1";
+static FILE *fp;
+
+struct query_trans {
+ int id;
+ bool inuse;
+ dns_rdatatype_t type;
+ dns_fixedname_t fixedname;
+ dns_name_t *qname;
+ dns_namelist_t answerlist;
+ dns_clientrestrans_t *xid;
+};
+
+static struct query_trans query_array[MAX_QUERIES];
+
+static isc_result_t dispatch_query(struct query_trans *trans);
+
+static void
+ctxs_destroy(isc_mem_t **mctxp, isc_appctx_t **actxp,
+ isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp,
+ isc_timermgr_t **timermgrp)
+{
+ if (*taskmgrp != NULL)
+ isc_taskmgr_destroy(taskmgrp);
+
+ if (*timermgrp != NULL)
+ isc_timermgr_destroy(timermgrp);
+
+ if (*socketmgrp != NULL)
+ isc_socketmgr_destroy(socketmgrp);
+
+ if (*actxp != NULL)
+ isc_appctx_destroy(actxp);
+
+ if (*mctxp != NULL)
+ isc_mem_destroy(mctxp);
+}
+
+static isc_result_t
+ctxs_init(isc_mem_t **mctxp, isc_appctx_t **actxp,
+ isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp,
+ isc_timermgr_t **timermgrp)
+{
+ isc_result_t result;
+
+ result = isc_mem_create(0, 0, mctxp);
+ if (result != ISC_R_SUCCESS)
+ goto fail;
+
+ result = isc_appctx_create(*mctxp, actxp);
+ if (result != ISC_R_SUCCESS)
+ goto fail;
+
+ result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, 0, taskmgrp);
+ if (result != ISC_R_SUCCESS)
+ goto fail;
+
+ result = isc_socketmgr_createinctx(*mctxp, *actxp, socketmgrp);
+ if (result != ISC_R_SUCCESS)
+ goto fail;
+
+ result = isc_timermgr_createinctx(*mctxp, *actxp, timermgrp);
+ if (result != ISC_R_SUCCESS)
+ goto fail;
+
+ return (ISC_R_SUCCESS);
+
+ fail:
+ ctxs_destroy(mctxp, actxp, taskmgrp, socketmgrp, timermgrp);
+
+ return (result);
+}
+
+static isc_result_t
+printdata(dns_rdataset_t *rdataset, dns_name_t *owner) {
+ isc_buffer_t target;
+ isc_result_t result;
+ isc_region_t r;
+ char t[4096];
+
+ isc_buffer_init(&target, t, sizeof(t));
+
+ if (!dns_rdataset_isassociated(rdataset))
+ return (ISC_R_SUCCESS);
+ result = dns_rdataset_totext(rdataset, owner, false, false,
+ &target);
+ if (result != ISC_R_SUCCESS)
+ return (result);
+ isc_buffer_usedregion(&target, &r);
+ printf(" %.*s", (int)r.length, (char *)r.base);
+
+ return (ISC_R_SUCCESS);
+}
+
+static void
+process_answer(isc_task_t *task, isc_event_t *event) {
+ struct query_trans *trans = event->ev_arg;
+ dns_clientresevent_t *rev = (dns_clientresevent_t *)event;
+ dns_name_t *name;
+ dns_rdataset_t *rdataset;
+ isc_result_t result;
+
+ REQUIRE(task == query_task);
+ REQUIRE(trans->inuse == true);
+ REQUIRE(outstanding_queries > 0);
+
+ printf("answer[%2d]\n", trans->id);
+
+ if (rev->result != ISC_R_SUCCESS)
+ printf(" failed: %u(%s)\n", rev->result,
+ dns_result_totext(rev->result));
+
+ for (name = ISC_LIST_HEAD(rev->answerlist); name != NULL;
+ name = ISC_LIST_NEXT(name, link)) {
+ for (rdataset = ISC_LIST_HEAD(name->list);
+ rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link)) {
+ (void)printdata(rdataset, name);
+ }
+ }
+
+ dns_client_freeresanswer(client, &rev->answerlist);
+ dns_client_destroyrestrans(&trans->xid);
+
+ isc_event_free(&event);
+
+ trans->inuse = false;
+ dns_fixedname_invalidate(&trans->fixedname);
+ trans->qname = NULL;
+ outstanding_queries--;
+
+ result = dispatch_query(trans);
+#if 0 /* for cancel test */
+ if (result == ISC_R_SUCCESS) {
+ static int count = 0;
+
+ if ((++count) % 10 == 0)
+ dns_client_cancelresolve(trans->xid);
+ }
+#endif
+ if (result == ISC_R_NOMORE && outstanding_queries == 0)
+ isc_app_ctxshutdown(query_actx);
+}
+
+static isc_result_t
+dispatch_query(struct query_trans *trans) {
+ isc_result_t result;
+ unsigned int namelen;
+ isc_buffer_t b;
+ char buf[4096]; /* XXX ad hoc constant, but should be enough */
+ char *cp;
+
+ REQUIRE(trans != NULL);
+ REQUIRE(trans->inuse == false);
+ REQUIRE(ISC_LIST_EMPTY(trans->answerlist));
+ REQUIRE(outstanding_queries < MAX_QUERIES);
+
+ /* Construct qname */
+ cp = fgets(buf, sizeof(buf), fp);
+ if (cp == NULL)
+ return (ISC_R_NOMORE);
+ /* zap NL if any */
+ if ((cp = strchr(buf, '\n')) != NULL)
+ *cp = '\0';
+ namelen = strlen(buf);
+ isc_buffer_init(&b, buf, namelen);
+ isc_buffer_add(&b, namelen);
+ trans->qname = dns_fixedname_initname(&trans->fixedname);
+ result = dns_name_fromtext(trans->qname, &b, dns_rootname, 0, NULL);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+
+ /* Start resolution */
+ result = dns_client_startresolve(client, trans->qname,
+ dns_rdataclass_in, trans->type, 0,
+ query_task, process_answer, trans,
+ &trans->xid);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+
+ trans->inuse = true;
+ outstanding_queries++;
+
+ return (ISC_R_SUCCESS);
+
+ cleanup:
+ dns_fixedname_invalidate(&trans->fixedname);
+
+ return (result);
+}
+
+ISC_PLATFORM_NORETURN_PRE static void
+usage(void) ISC_PLATFORM_NORETURN_POST;
+
+static void
+usage(void) {
+ fprintf(stderr, "usage: sample-async [-s server_address] [-t RR type] "
+ "input_file\n");
+
+ exit(1);
+}
+
+int
+main(int argc, char *argv[]) {
+ int ch;
+ isc_textregion_t tr;
+ isc_mem_t *mctx = NULL;
+ isc_taskmgr_t *taskmgr = NULL;
+ isc_socketmgr_t *socketmgr = NULL;
+ isc_timermgr_t *timermgr = NULL;
+ int nservers = 0;
+ const char *serveraddr[MAX_SERVERS];
+ isc_sockaddr_t sa[MAX_SERVERS];
+ isc_sockaddrlist_t servers;
+ dns_rdatatype_t type = dns_rdatatype_a;
+ struct in_addr inaddr;
+ isc_result_t result;
+ int i;
+
+ while ((ch = isc_commandline_parse(argc, argv, "s:t:")) != -1) {
+ switch (ch) {
+ case 't':
+ tr.base = isc_commandline_argument;
+ tr.length = strlen(isc_commandline_argument);
+ result = dns_rdatatype_fromtext(&type, &tr);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr,
+ "invalid RRtype: %s\n",
+ isc_commandline_argument);
+ exit(1);
+ }
+ break;
+ case 's':
+ if (nservers == MAX_SERVERS) {
+ fprintf(stderr,
+ "too many servers (up to %d)\n",
+ MAX_SERVERS);
+ exit(1);
+ }
+ serveraddr[nservers++] =
+ (const char *)isc_commandline_argument;
+ break;
+ default:
+ usage();
+ }
+ }
+
+ argc -= isc_commandline_index;
+ argv += isc_commandline_index;
+ if (argc < 1)
+ usage();
+
+ if (nservers == 0) {
+ nservers = 1;
+ serveraddr[0] = def_server;
+ }
+
+ for (i = 0; i < MAX_QUERIES; i++) {
+ query_array[i].id = i;
+ query_array[i].inuse = false;
+ query_array[i].type = type;
+ dns_fixedname_init(&query_array[i].fixedname);
+ query_array[i].qname = NULL;
+ ISC_LIST_INIT(query_array[i].answerlist);
+ query_array[i].xid = NULL;
+ }
+
+ isc_lib_register();
+ result = dns_lib_init();
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "dns_lib_init failed: %u\n", result);
+ exit(1);
+ }
+
+ result = ctxs_init(&mctx, &query_actx, &taskmgr, &socketmgr,
+ &timermgr);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "ctx create failed: %u\n", result);
+ exit(1);
+ }
+
+ isc_app_ctxstart(query_actx);
+
+ result = dns_client_createx(mctx, query_actx, taskmgr, socketmgr,
+ timermgr, 0, &client);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "dns_client_createx failed: %u\n", result);
+ exit(1);
+ }
+
+ /* Set nameservers */
+ ISC_LIST_INIT(servers);
+ for (i = 0; i < nservers; i++) {
+ if (inet_pton(AF_INET, serveraddr[i], &inaddr) != 1) {
+ fprintf(stderr, "failed to parse IPv4 address %s\n",
+ serveraddr[i]);
+ exit(1);
+ }
+ isc_sockaddr_fromin(&sa[i], &inaddr, 53);
+ ISC_LIST_APPEND(servers, &sa[i], link);
+ }
+ result = dns_client_setservers(client, dns_rdataclass_in, NULL,
+ &servers);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "set server failed: %u\n", result);
+ exit(1);
+ }
+
+ /* Create the main task */
+ query_task = NULL;
+ result = isc_task_create(taskmgr, 0, &query_task);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to create task: %u\n", result);
+ exit(1);
+ }
+
+ /* Open input file */
+ fp = fopen(argv[0], "r");
+ if (fp == NULL) {
+ fprintf(stderr, "failed to open input file: %s\n", argv[1]);
+ exit(1);
+ }
+
+ /* Dispatch initial queries */
+ for (i = 0; i < MAX_QUERIES; i++) {
+ result = dispatch_query(&query_array[i]);
+ if (result == ISC_R_NOMORE)
+ break;
+ }
+
+ /* Start event loop */
+ isc_app_ctxrun(query_actx);
+
+ /* Sanity check */
+ for (i = 0; i < MAX_QUERIES; i++)
+ INSIST(query_array[i].inuse == false);
+
+ /* Cleanup */
+ isc_task_detach(&query_task);
+ dns_client_destroy(&client);
+ dns_lib_shutdown();
+ isc_app_ctxfinish(query_actx);
+ ctxs_destroy(&mctx, &query_actx, &taskmgr, &socketmgr, &timermgr);
+
+ return (0);
+}