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-rw-r--r--lib/samples/resolve.c494
1 files changed, 494 insertions, 0 deletions
diff --git a/lib/samples/resolve.c b/lib/samples/resolve.c
new file mode 100644
index 0000000..30389fc
--- /dev/null
+++ b/lib/samples/resolve.c
@@ -0,0 +1,494 @@
+/*
+ * 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 <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <arpa/inet.h>
+
+#include <netdb.h>
+#include <unistd.h>
+#endif
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <isc/base64.h>
+#include <isc/buffer.h>
+#include <isc/commandline.h>
+#include <isc/lib.h>
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/sockaddr.h>
+#include <isc/util.h>
+#include <isc/app.h>
+#include <isc/task.h>
+#include <isc/socket.h>
+#include <isc/timer.h>
+
+#include <irs/resconf.h>
+#include <irs/netdb.h>
+
+#include <dns/client.h>
+#include <dns/fixedname.h>
+#include <dns/keyvalues.h>
+#include <dns/lib.h>
+#include <dns/name.h>
+#include <dns/rdata.h>
+#include <dns/rdataset.h>
+#include <dns/rdatastruct.h>
+#include <dns/rdatatype.h>
+#include <dns/result.h>
+#include <dns/secalg.h>
+
+#include <dst/dst.h>
+
+static char *algname;
+
+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];
+
+ if (!dns_rdataset_isassociated(rdataset)) {
+ printf("[WARN: empty]\n");
+ return (ISC_R_SUCCESS);
+ }
+
+ isc_buffer_init(&target, t, sizeof(t));
+
+ 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);
+}
+
+ISC_PLATFORM_NORETURN_PRE static void
+usage(void) ISC_PLATFORM_NORETURN_POST;
+
+static void
+usage(void) {
+ fprintf(stderr, "resolve [-t RRtype] "
+ "[[-a algorithm] [-e] -k keyname -K keystring] "
+ "[-S domain:serveraddr_for_domain ] [-s server_address]"
+ "[-b address[#port]] hostname\n");
+
+ exit(1);
+}
+
+static void
+set_key(dns_client_t *client, char *keynamestr, char *keystr,
+ bool is_sep, isc_mem_t **mctxp)
+{
+ isc_result_t result;
+ dns_fixedname_t fkeyname;
+ unsigned int namelen;
+ dns_name_t *keyname;
+ dns_rdata_dnskey_t keystruct;
+ unsigned char keydata[4096];
+ isc_buffer_t keydatabuf;
+ unsigned char rrdata[4096];
+ isc_buffer_t rrdatabuf;
+ isc_buffer_t b;
+ isc_textregion_t tr;
+ isc_region_t r;
+ dns_secalg_t alg;
+
+ result = isc_mem_create(0, 0, mctxp);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to create mctx\n");
+ exit(1);
+ }
+
+ if (algname != NULL) {
+ tr.base = algname;
+ tr.length = strlen(algname);
+ result = dns_secalg_fromtext(&alg, &tr);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to identify the algorithm\n");
+ exit(1);
+ }
+ } else
+ alg = DNS_KEYALG_RSASHA1;
+
+ keystruct.common.rdclass = dns_rdataclass_in;
+ keystruct.common.rdtype = dns_rdatatype_dnskey;
+ keystruct.flags = DNS_KEYOWNER_ZONE; /* fixed */
+ if (is_sep)
+ keystruct.flags |= DNS_KEYFLAG_KSK;
+ keystruct.protocol = DNS_KEYPROTO_DNSSEC; /* fixed */
+ keystruct.algorithm = alg;
+
+ isc_buffer_init(&keydatabuf, keydata, sizeof(keydata));
+ isc_buffer_init(&rrdatabuf, rrdata, sizeof(rrdata));
+ result = isc_base64_decodestring(keystr, &keydatabuf);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "base64 decode failed\n");
+ exit(1);
+ }
+ isc_buffer_usedregion(&keydatabuf, &r);
+ keystruct.datalen = r.length;
+ keystruct.data = r.base;
+
+ result = dns_rdata_fromstruct(NULL, keystruct.common.rdclass,
+ keystruct.common.rdtype,
+ &keystruct, &rrdatabuf);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to construct key rdata\n");
+ exit(1);
+ }
+ namelen = strlen(keynamestr);
+ isc_buffer_init(&b, keynamestr, namelen);
+ isc_buffer_add(&b, namelen);
+ keyname = dns_fixedname_initname(&fkeyname);
+ result = dns_name_fromtext(keyname, &b, dns_rootname, 0, NULL);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to construct key name\n");
+ exit(1);
+ }
+ result = dns_client_addtrustedkey(client, dns_rdataclass_in,
+ keyname, &rrdatabuf);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to add key for %s\n",
+ keynamestr);
+ exit(1);
+ }
+}
+
+static void
+addserver(dns_client_t *client, const char *addrstr, const char *port,
+ const char *name_space)
+{
+ struct addrinfo hints, *res;
+ int gaierror;
+ isc_sockaddr_t sa;
+ isc_sockaddrlist_t servers;
+ isc_result_t result;
+ unsigned int namelen;
+ isc_buffer_t b;
+ dns_fixedname_t fname;
+ dns_name_t *name = NULL;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_protocol = IPPROTO_UDP;
+ hints.ai_flags = AI_NUMERICHOST;
+ gaierror = getaddrinfo(addrstr, port, &hints, &res);
+ if (gaierror != 0) {
+ fprintf(stderr, "getaddrinfo failed: %s\n",
+ gai_strerror(gaierror));
+ exit(1);
+ }
+ INSIST(res->ai_addrlen <= sizeof(sa.type));
+ memmove(&sa.type, res->ai_addr, res->ai_addrlen);
+ sa.length = (unsigned int)res->ai_addrlen;
+ freeaddrinfo(res);
+ ISC_LINK_INIT(&sa, link);
+ ISC_LIST_INIT(servers);
+ ISC_LIST_APPEND(servers, &sa, link);
+
+ if (name_space != NULL) {
+ namelen = strlen(name_space);
+ isc_buffer_constinit(&b, name_space, namelen);
+ isc_buffer_add(&b, namelen);
+ name = dns_fixedname_initname(&fname);
+ result = dns_name_fromtext(name, &b, dns_rootname, 0, NULL);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to convert qname: %u\n",
+ result);
+ exit(1);
+ }
+ }
+
+ result = dns_client_setservers(client, dns_rdataclass_in, name,
+ &servers);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "set server failed: %u\n", result);
+ exit(1);
+ }
+}
+
+int
+main(int argc, char *argv[]) {
+ int ch;
+ isc_textregion_t tr;
+ char *server = NULL;
+ char *altserver = NULL;
+ char *altserveraddr = NULL;
+ char *altservername = NULL;
+ dns_client_t *client = NULL;
+ char *keynamestr = NULL;
+ char *keystr = NULL;
+ isc_result_t result;
+ isc_buffer_t b;
+ dns_fixedname_t qname0;
+ unsigned int namelen;
+ dns_name_t *qname, *name;
+ dns_rdatatype_t type = dns_rdatatype_a;
+ dns_rdataset_t *rdataset;
+ dns_namelist_t namelist;
+ isc_mem_t *keymctx = NULL;
+ unsigned int clientopt, resopt;
+ bool is_sep = false;
+ const char *port = "53";
+ isc_mem_t *mctx = NULL;
+ isc_appctx_t *actx = NULL;
+ isc_taskmgr_t *taskmgr = NULL;
+ isc_socketmgr_t *socketmgr = NULL;
+ isc_timermgr_t *timermgr = NULL;
+ struct in_addr in4;
+ struct in6_addr in6;
+ isc_sockaddr_t a4, a6;
+ isc_sockaddr_t *addr4 = NULL, *addr6 = NULL;
+
+ while ((ch = isc_commandline_parse(argc, argv,
+ "a:b:es:t:k:K:p:S:")) != -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 'a':
+ algname = isc_commandline_argument;
+ break;
+ case 'b':
+ if (inet_pton(AF_INET,
+ isc_commandline_argument, &in4) == 1) {
+ if (addr4 != NULL) {
+ fprintf(stderr, "only one local "
+ "address per family "
+ "can be specified\n");
+ exit(1);
+ }
+ isc_sockaddr_fromin(&a4, &in4, 0);
+ addr4 = &a4;
+ } else if (inet_pton(AF_INET6,
+ isc_commandline_argument,
+ &in6) == 1) {
+ if (addr6 != NULL) {
+ fprintf(stderr, "only one local "
+ "address per family "
+ "can be specified\n");
+ exit(1);
+ }
+ isc_sockaddr_fromin6(&a6, &in6, 0);
+ addr6 = &a6;
+ } else {
+ fprintf(stderr, "invalid address %s\n",
+ isc_commandline_argument);
+ exit(1);
+ }
+ break;
+ case 'e':
+ is_sep = true;
+ break;
+ case 'S':
+ if (altserver != NULL) {
+ fprintf(stderr, "alternate server "
+ "already defined: %s\n",
+ altserver);
+ exit(1);
+ }
+ altserver = isc_commandline_argument;
+ break;
+ case 's':
+ if (server != NULL) {
+ fprintf(stderr, "server "
+ "already defined: %s\n",
+ server);
+ exit(1);
+ }
+ server = isc_commandline_argument;
+ break;
+ case 'k':
+ keynamestr = isc_commandline_argument;
+ break;
+ case 'K':
+ keystr = isc_commandline_argument;
+ break;
+ case 'p':
+ port = isc_commandline_argument;
+ break;
+ default:
+ usage();
+ }
+ }
+
+ argc -= isc_commandline_index;
+ argv += isc_commandline_index;
+ if (argc < 1)
+ usage();
+
+ if (altserver != NULL) {
+ char *cp;
+
+ cp = strchr(altserver, ':');
+ if (cp == NULL) {
+ fprintf(stderr, "invalid alternate server: %s\n",
+ altserver);
+ exit(1);
+ }
+ *cp = '\0';
+ altservername = altserver;
+ altserveraddr = cp + 1;
+ }
+
+ isc_lib_register();
+ result = dns_lib_init();
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "dns_lib_init failed: %u\n", result);
+ exit(1);
+ }
+
+ result = isc_mem_create(0, 0, &mctx);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "failed to crate mctx\n");
+ exit(1);
+ }
+
+ result = isc_appctx_create(mctx, &actx);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+ result = isc_app_ctxstart(actx);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+ result = isc_taskmgr_createinctx(mctx, actx, 1, 0, &taskmgr);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+ result = isc_socketmgr_createinctx(mctx, actx, &socketmgr);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+ result = isc_timermgr_createinctx(mctx, actx, &timermgr);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+
+ clientopt = 0;
+ result = dns_client_createx2(mctx, actx, taskmgr, socketmgr, timermgr,
+ clientopt, &client, addr4, addr6);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr, "dns_client_create failed: %u, %s\n", result,
+ isc_result_totext(result));
+ exit(1);
+ }
+
+ /* Set the nameserver */
+ if (server == NULL) {
+ irs_resconf_t *resconf = NULL;
+ isc_sockaddrlist_t *nameservers;
+
+ result = irs_resconf_load(mctx, "/etc/resolv.conf", &resconf);
+ if (result != ISC_R_SUCCESS && result != ISC_R_FILENOTFOUND) {
+ fprintf(stderr, "irs_resconf_load failed: %u\n",
+ result);
+ exit(1);
+ }
+ nameservers = irs_resconf_getnameservers(resconf);
+ result = dns_client_setservers(client, dns_rdataclass_in,
+ NULL, nameservers);
+ if (result != ISC_R_SUCCESS) {
+ irs_resconf_destroy(&resconf);
+ fprintf(stderr, "dns_client_setservers failed: %u\n",
+ result);
+ exit(1);
+ }
+ irs_resconf_destroy(&resconf);
+ } else {
+ addserver(client, server, port, NULL);
+ }
+
+ /* Set the alternate nameserver (when specified) */
+ if (altserver != NULL)
+ addserver(client, altserveraddr, port, altservername);
+
+ /* Install DNSSEC key (if given) */
+ if (keynamestr != NULL) {
+ if (keystr == NULL) {
+ fprintf(stderr,
+ "key string is missing "
+ "while key name is provided\n");
+ exit(1);
+ }
+ set_key(client, keynamestr, keystr, is_sep, &keymctx);
+ }
+
+ /* Construct qname */
+ namelen = strlen(argv[0]);
+ isc_buffer_init(&b, argv[0], namelen);
+ isc_buffer_add(&b, namelen);
+ qname = dns_fixedname_initname(&qname0);
+ result = dns_name_fromtext(qname, &b, dns_rootname, 0, NULL);
+ if (result != ISC_R_SUCCESS)
+ fprintf(stderr, "failed to convert qname: %u\n", result);
+
+ /* Perform resolution */
+ resopt = DNS_CLIENTRESOPT_ALLOWRUN;
+ if (keynamestr == NULL)
+ resopt |= DNS_CLIENTRESOPT_NODNSSEC;
+ ISC_LIST_INIT(namelist);
+ result = dns_client_resolve(client, qname, dns_rdataclass_in, type,
+ resopt, &namelist);
+ if (result != ISC_R_SUCCESS) {
+ fprintf(stderr,
+ "resolution failed: %s\n", dns_result_totext(result));
+ }
+ for (name = ISC_LIST_HEAD(namelist); name != NULL;
+ name = ISC_LIST_NEXT(name, link)) {
+ for (rdataset = ISC_LIST_HEAD(name->list);
+ rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link)) {
+ if (printdata(rdataset, name) != ISC_R_SUCCESS)
+ fprintf(stderr, "print data failed\n");
+ }
+ }
+
+ dns_client_freeresanswer(client, &namelist);
+
+ /* Cleanup */
+cleanup:
+ dns_client_destroy(&client);
+
+ if (taskmgr != NULL)
+ isc_taskmgr_destroy(&taskmgr);
+ if (timermgr != NULL)
+ isc_timermgr_destroy(&timermgr);
+ if (socketmgr != NULL)
+ isc_socketmgr_destroy(&socketmgr);
+ if (actx != NULL)
+ isc_appctx_destroy(&actx);
+ isc_mem_detach(&mctx);
+
+ if (keynamestr != NULL)
+ isc_mem_destroy(&keymctx);
+ dns_lib_shutdown();
+
+ return (0);
+}
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