resolve.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
* Copyright (C) 2009, 2012-2016 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/.
*/
#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 <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, ISC_FALSE, ISC_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,
isc_boolean_t 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);
dns_fixedname_init(&fkeyname);
keyname = dns_fixedname_name(&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 *namespace)
{
struct addrinfo hints, *res;
int gai_error;
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;
gai_error = getaddrinfo(addrstr, port, &hints, &res);
if (gai_error != 0) {
fprintf(stderr, "getaddrinfo failed: %s\n",
gai_strerror(gai_error));
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 (namespace != NULL) {
namelen = strlen(namespace);
isc_buffer_constinit(&b, namespace, namelen);
isc_buffer_add(&b, namelen);
dns_fixedname_init(&fname);
name = dns_fixedname_name(&fname);
result = dns_name_fromtext(name, &b, dns_rootname, 0, NULL);
if (result != ISC_R_SUCCESS) {
fprintf(stderr, "failed to convert qname: %d\n",
result);
exit(1);
}
}
result = dns_client_setservers(client, dns_rdataclass_in, name,
&servers);
if (result != ISC_R_SUCCESS) {
fprintf(stderr, "set server failed: %d\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;
isc_boolean_t is_sep = ISC_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 = ISC_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: %d\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: %d, %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: %d\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: %d\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);
dns_fixedname_init(&qname0);
qname = dns_fixedname_name(&qname0);
result = dns_name_fromtext(qname, &b, dns_rootname, 0, NULL);
if (result != ISC_R_SUCCESS)
fprintf(stderr, "failed to convert qname: %d\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);
}