This file is part of GNUnet.
Copyright (C) 2012-2013 GNUnet e.V.
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
+ GNUnet is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
+ SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file gnunet-dns2gns.c
#include <gnunet_util_lib.h>
#include <gnunet_dnsparser_lib.h>
#include <gnunet_gns_service.h>
-#include <gnunet_identity_service.h>
#include <gnunet_dnsstub_lib.h>
#include "gns.h"
*/
#define TIMEOUT GNUNET_TIME_UNIT_MINUTES
-/**
- * Default suffix
- */
-#define DNS_SUFFIX ".zkey.eu"
-
-/**
- * FCFS suffix
- */
-#define FCFS_SUFFIX "fcfs.zkey.eu"
-
/**
* Data kept per request.
*/
/**
* Our GNS request handle.
*/
- struct GNUNET_GNS_LookupRequest *lookup;
+ struct GNUNET_GNS_LookupWithTldRequest *lookup;
/**
* Our DNS request handle
* Task run on timeout or shutdown to clean up without
* response.
*/
- struct GNUNET_SCHEDULER_Task * timeout_task;
+ struct GNUNET_SCHEDULER_Task *timeout_task;
/**
- * Number of bytes in 'addr'.
+ * Original UDP request message.
+ */
+ char *udp_msg;
+
+ /**
+ * Number of bytes in @e addr.
*/
size_t addr_len;
+ /**
+ * Number of bytes in @e udp_msg.
+ */
+ size_t udp_msg_size;
+
+ /**
+ * ID of the original request.
+ */
+ uint16_t original_request_id;
};
/**
* Task for IPv4 socket.
*/
-static struct GNUNET_SCHEDULER_Task * t4;
+static struct GNUNET_SCHEDULER_Task *t4;
/**
* Task for IPv6 socket.
*/
-static struct GNUNET_SCHEDULER_Task * t6;
-
-/**
- * DNS suffix, suffix of this gateway in DNS; defaults to '.zkey.eu'
- */
-static char *dns_suffix;
-
-/**
- * FCFS suffix, suffix of FCFS-authority in DNS; defaults to 'fcfs.zkey.eu'.
- */
-static char *fcfs_suffix;
+static struct GNUNET_SCHEDULER_Task *t6;
/**
* IP of DNS server
/**
* UDP Port we listen on for inbound DNS requests.
*/
-static unsigned int listen_port = 2853;
-
-/**
- * Which GNS zone do we translate incoming DNS requests to?
- */
-static struct GNUNET_CRYPTO_EcdsaPublicKey my_zone;
-
-/**
- * '-z' option with the main zone to use.
- */
-static char *gns_zone_str;
+static unsigned int listen_port = 53;
/**
* Configuration to use.
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
-/**
- * Connection to identity service.
- */
-static struct GNUNET_IDENTITY_Handle *identity;
-
-/**
- * Request for our ego.
- */
-static struct GNUNET_IDENTITY_Operation *id_op;
-
/**
* Task run on shutdown. Cleans up everything.
static void
do_shutdown (void *cls)
{
+ (void) cls;
if (NULL != t4)
{
GNUNET_SCHEDULER_cancel (t4);
GNUNET_NETWORK_socket_close (listen_socket6);
listen_socket6 = NULL;
}
- if (NULL != id_op)
- {
- GNUNET_IDENTITY_cancel (id_op);
- id_op = NULL;
- }
- if (NULL != identity)
- {
- GNUNET_IDENTITY_disconnect (identity);
- identity = NULL;
- }
if (NULL != gns)
{
GNUNET_GNS_disconnect (gns);
{
char *buf;
size_t size;
+ ssize_t sret;
if (GNUNET_SYSERR ==
GNUNET_DNSPARSER_pack (request->packet,
}
else
{
- if (size !=
- GNUNET_NETWORK_socket_sendto (request->lsock,
- buf, size,
- request->addr,
- request->addr_len))
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "sendto");
+ sret = GNUNET_NETWORK_socket_sendto (request->lsock,
+ buf,
+ size,
+ request->addr,
+ request->addr_len);
+ if ( (sret < 0) ||
+ (size != (size_t) sret) )
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
+ "sendto");
GNUNET_free (buf);
}
GNUNET_SCHEDULER_cancel (request->timeout_task);
GNUNET_DNSPARSER_free_packet (request->packet);
+ GNUNET_free (request->udp_msg);
GNUNET_free (request);
}
if (NULL != request->packet)
GNUNET_DNSPARSER_free_packet (request->packet);
if (NULL != request->lookup)
- GNUNET_GNS_lookup_cancel (request->lookup);
+ GNUNET_GNS_lookup_with_tld_cancel (request->lookup);
if (NULL != request->dns_lookup)
GNUNET_DNSSTUB_resolve_cancel (request->dns_lookup);
+ GNUNET_free (request->udp_msg);
GNUNET_free (request);
}
* Iterator called on obtained result for a DNS lookup
*
* @param cls closure
- * @param rs the request socket
* @param dns the DNS udp payload
* @param r size of the DNS payload
*/
static void
dns_result_processor (void *cls,
- struct GNUNET_DNSSTUB_RequestSocket *rs,
const struct GNUNET_TUN_DnsHeader *dns,
size_t r)
{
struct Request *request = cls;
- request->packet = GNUNET_DNSPARSER_parse ((char*)dns, r);
+ if (NULL == dns)
+ {
+ /* DNSSTUB gave up, so we trigger timeout early */
+ GNUNET_SCHEDULER_cancel (request->timeout_task);
+ do_timeout (request);
+ return;
+ }
+ if (request->original_request_id != dns->id)
+ {
+ /* for a another query, ignore */
+ return;
+ }
+ request->packet = GNUNET_DNSPARSER_parse ((char*)dns,
+ r);
+ GNUNET_DNSSTUB_resolve_cancel (request->dns_lookup);
send_response (request);
}
* Iterator called on obtained result for a GNS lookup.
*
* @param cls closure
+ * @param was_gns #GNUNET_NO if the TLD is not configured for GNS
* @param rd_count number of records in @a rd
* @param rd the records in reply
*/
static void
result_processor (void *cls,
+ int was_gns,
uint32_t rd_count,
const struct GNUNET_GNSRECORD_Data *rd)
{
struct Request *request = cls;
struct GNUNET_DNSPARSER_Packet *packet;
- uint32_t i;
struct GNUNET_DNSPARSER_Record rec;
request->lookup = NULL;
+ if (GNUNET_NO == was_gns)
+ {
+ /* TLD not configured for GNS, fall back to DNS */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Using DNS resolver IP `%s' to resolve `%s'\n",
+ dns_ip,
+ request->packet->queries[0].name);
+ request->original_request_id = request->packet->id;
+ GNUNET_DNSPARSER_free_packet (request->packet);
+ request->packet = NULL;
+ request->dns_lookup = GNUNET_DNSSTUB_resolve (dns_stub,
+ request->udp_msg,
+ request->udp_msg_size,
+ &dns_result_processor,
+ request);
+ return;
+ }
packet = request->packet;
packet->flags.query_or_response = 1;
packet->flags.return_code = GNUNET_TUN_DNS_RETURN_CODE_NO_ERROR;
packet->flags.message_truncated = 0;
packet->flags.authoritative_answer = 0;
//packet->flags.opcode = GNUNET_TUN_DNS_OPCODE_STATUS; // ???
- for (i=0;i<rd_count;i++)
+ for (uint32_t i=0;i<rd_count;i++)
{
// FIXME: do we need to hanlde #GNUNET_GNSRECORD_RF_SHADOW_RECORD
// here? Or should we do this in libgnunetgns?
{
struct Request *request;
struct GNUNET_DNSPARSER_Packet *packet;
- char *name;
- size_t name_len;
- int type;
- int use_gns;
- packet = GNUNET_DNSPARSER_parse (udp_msg, udp_msg_size);
+ packet = GNUNET_DNSPARSER_parse (udp_msg,
+ udp_msg_size);
if (NULL == packet)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Cannot parse DNS request from %s\n"),
- GNUNET_a2s (addr, addr_len));
- return;
- }
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Cannot parse DNS request from %s\n"),
+ GNUNET_a2s (addr, addr_len));
+ return;
+ }
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received request for `%s' with flags %u, #answers %d, #auth %d, #additional %d\n",
packet->queries[0].name,
if ( (0 != packet->flags.query_or_response) ||
(0 != packet->num_answers) ||
(0 != packet->num_authority_records))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Received malformed DNS request from %s\n"),
- GNUNET_a2s (addr, addr_len));
- GNUNET_DNSPARSER_free_packet (packet);
- return;
- }
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Received malformed DNS request from %s\n"),
+ GNUNET_a2s (addr, addr_len));
+ GNUNET_DNSPARSER_free_packet (packet);
+ return;
+ }
if ( (1 != packet->num_queries) )
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Received unsupported DNS request from %s\n"),
- GNUNET_a2s (addr, addr_len));
- GNUNET_DNSPARSER_free_packet (packet);
- return;
- }
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Received unsupported DNS request from %s\n"),
+ GNUNET_a2s (addr,
+ addr_len));
+ GNUNET_DNSPARSER_free_packet (packet);
+ return;
+ }
request = GNUNET_malloc (sizeof (struct Request) + addr_len);
request->lsock = lsock;
request->packet = packet;
request->addr = &request[1];
request->addr_len = addr_len;
- GNUNET_memcpy (&request[1], addr, addr_len);
+ GNUNET_memcpy (&request[1],
+ addr,
+ addr_len);
+ request->udp_msg_size = udp_msg_size;
+ request->udp_msg = GNUNET_memdup (udp_msg,
+ udp_msg_size);
request->timeout_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT,
&do_timeout,
request);
- name = GNUNET_strdup (packet->queries[0].name);
- name_len = strlen (name);
- use_gns = GNUNET_NO;
-
-
- if ( (name_len > strlen (fcfs_suffix)) &&
- (0 == strcasecmp (fcfs_suffix,
- &name[name_len - strlen (fcfs_suffix)])) )
- {
- /* replace ".fcfs.zkey.eu" with ".gnu" */
- strcpy (&name[name_len - strlen (fcfs_suffix)],
- ".gnu");
- use_gns = GNUNET_YES;
- }
- else if ( (name_len > strlen (dns_suffix)) &&
- (0 == strcasecmp (dns_suffix,
- &name[name_len - strlen (dns_suffix)])) )
- {
- /* replace ".zkey.eu" with ".zkey" */
- strcpy (&name[name_len - strlen (dns_suffix)],
- ".zkey");
- use_gns = GNUNET_YES;
- } else if ( (name_len > strlen (".gnu")) &&
- (0 == strcasecmp (".gnu",
- &name[name_len - strlen (".gnu")])) )
- {
- /* name is in GNS */
- use_gns = GNUNET_YES;
- }
- if (GNUNET_YES == use_gns)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Calling GNS on `%s'\n",
- name);
- type = packet->queries[0].type;
- request->lookup = GNUNET_GNS_lookup (gns,
- name,
- &my_zone,
- type,
- GNUNET_NO,
- NULL /* no shorten */,
- &result_processor,
- request);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Using DNS resolver IP `%s' to resolve `%s'\n",
- dns_ip,
- name);
- GNUNET_DNSPARSER_free_packet (request->packet);
- request->packet = NULL;
- request->dns_lookup = GNUNET_DNSSTUB_resolve2 (dns_stub,
- udp_msg,
- udp_msg_size,
- &dns_result_processor,
- request);
- }
- GNUNET_free (name);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling GNS on `%s'\n",
+ packet->queries[0].name);
+ request->lookup = GNUNET_GNS_lookup_with_tld (gns,
+ packet->queries[0].name,
+ packet->queries[0].type,
+ GNUNET_NO,
+ &result_processor,
+ request);
}
}
{
char buf[size + 1];
+ ssize_t sret;
addrlen = sizeof (v4);
- GNUNET_break (size ==
- GNUNET_NETWORK_socket_recvfrom (listen_socket4,
- buf,
- size + 1,
- (struct sockaddr *) &v4,
- &addrlen));
+ sret = GNUNET_NETWORK_socket_recvfrom (listen_socket4,
+ buf,
+ size + 1,
+ (struct sockaddr *) &v4,
+ &addrlen);
+ if (0 > sret)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
+ "recvfrom");
+ return;
+ }
+ GNUNET_break (size == sret);
handle_request (listen_socket4,
&v4,
addrlen,
}
{
char buf[size];
+ ssize_t sret;
addrlen = sizeof (v6);
- GNUNET_break (size ==
- GNUNET_NETWORK_socket_recvfrom (listen_socket6,
- buf,
- size,
- (struct sockaddr *) &v6,
- &addrlen));
- handle_request (listen_socket6, &v6, addrlen,
- buf, size);
+ sret = GNUNET_NETWORK_socket_recvfrom (listen_socket6,
+ buf,
+ size,
+ (struct sockaddr *) &v6,
+ &addrlen);
+ if (0 > sret)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
+ "recvfrom");
+ return;
+ }
+ GNUNET_break (size == sret);
+ handle_request (listen_socket6,
+ &v6,
+ addrlen,
+ buf,
+ size);
}
}
/**
- * Start DNS daemon.
+ * Main function that will be run.
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param c configuration
*/
static void
-run_dnsd ()
+run (void *cls,
+ char *const *args,
+ const char *cfgfile,
+ const struct GNUNET_CONFIGURATION_Handle *c)
{
- if (NULL == dns_suffix)
- dns_suffix = DNS_SUFFIX;
- if (NULL == fcfs_suffix)
- fcfs_suffix = FCFS_SUFFIX;
+ (void) cls;
+ (void) args;
+ (void) cfgfile;
+ cfg = c;
+ if (NULL == dns_ip)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("No DNS server specified!\n"));
+ return;
+ }
+ GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
+ NULL);
if (NULL == (gns = GNUNET_GNS_connect (cfg)))
return;
- if (NULL == (dns_stub = GNUNET_DNSSTUB_start (dns_ip)))
+ GNUNET_assert (NULL != (dns_stub = GNUNET_DNSSTUB_start (128)));
+ if (GNUNET_OK !=
+ GNUNET_DNSSTUB_add_dns_ip (dns_stub,
+ dns_ip))
{
+ GNUNET_DNSSTUB_stop (dns_stub);
GNUNET_GNS_disconnect (gns);
gns = NULL;
return;
if (NULL != listen_socket4)
{
struct sockaddr_in v4;
-
+
memset (&v4, 0, sizeof (v4));
v4.sin_family = AF_INET;
#if HAVE_SOCKADDR_IN_SIN_LEN
if (NULL != listen_socket6)
{
struct sockaddr_in6 v6;
-
+
memset (&v6, 0, sizeof (v6));
v6.sin6_family = AF_INET6;
#if HAVE_SOCKADDR_IN_SIN_LEN
}
-/**
- * Method called to inform about the egos of this peer.
- *
- * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
- * this function is only called ONCE, and 'NULL' being passed in
- * @a ego does indicate an error (i.e. name is taken or no default
- * value is known). If @a ego is non-NULL and if '*ctx'
- * is set in those callbacks, the value WILL be passed to a subsequent
- * call to the identity callback of #GNUNET_IDENTITY_connect (if
- * that one was not NULL).
- *
- * @param cls closure, NULL
- * @param ego ego handle
- * @param ctx context for application to store data for this ego
- * (during the lifetime of this process, initially NULL)
- * @param name name assigned by the user for this ego,
- * NULL if the user just deleted the ego and it
- * must thus no longer be used
- */
-static void
-identity_cb (void *cls,
- struct GNUNET_IDENTITY_Ego *ego,
- void **ctx,
- const char *name)
-{
- id_op = NULL;
- if (NULL == ego)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("No ego configured for `dns2gns` subsystem\n"));
- return;
- }
- GNUNET_IDENTITY_ego_get_public_key (ego,
- &my_zone);
- run_dnsd ();
-}
-
-
-/**
- * Main function that will be run.
- *
- * @param cls closure
- * @param args remaining command-line arguments
- * @param cfgfile name of the configuration file used (for saving, can be NULL!)
- * @param c configuration
- */
-static void
-run (void *cls,
- char *const *args,
- const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *c)
-{
- cfg = c;
-
- if (NULL == dns_ip)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("No DNS server specified!\n"));
- return;
- }
- GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
- if (NULL == gns_zone_str)
- {
- identity = GNUNET_IDENTITY_connect (cfg,
- NULL, NULL);
- id_op = GNUNET_IDENTITY_get (identity,
- "dns2gns",
- &identity_cb,
- NULL);
- return;
- }
- if ( (NULL == gns_zone_str) ||
- (GNUNET_OK !=
- GNUNET_CRYPTO_ecdsa_public_key_from_string (gns_zone_str,
- strlen (gns_zone_str),
- &my_zone)) )
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("No valid GNS zone specified!\n"));
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- run_dnsd ();
-}
-
-
/**
* The main function for the dns2gns daemon.
*
main (int argc,
char *const *argv)
{
- static const struct GNUNET_GETOPT_CommandLineOption options[] = {
- {'d', "dns", "IP",
- gettext_noop ("IP of recursive DNS resolver to use (required)"), 1,
- &GNUNET_GETOPT_set_string, &dns_ip},
- {'f', "fcfs", "NAME",
- gettext_noop ("Authoritative FCFS suffix to use (optional); default: fcfs.zkey.eu"), 1,
- &GNUNET_GETOPT_set_string, &fcfs_suffix},
- {'s', "suffix", "SUFFIX",
- gettext_noop ("Authoritative DNS suffix to use (optional); default: zkey.eu"), 1,
- &GNUNET_GETOPT_set_string, &dns_suffix},
- {'p', "port", "UDPPORT",
- gettext_noop ("UDP port to listen on for inbound DNS requests; default: 2853"), 1,
- &GNUNET_GETOPT_set_uint, &listen_port},
- {'z', "zone", "PUBLICKEY",
- gettext_noop ("Public key of the GNS zone to use (overrides default)"), 1,
- &GNUNET_GETOPT_set_string, &gns_zone_str},
+ struct GNUNET_GETOPT_CommandLineOption options[] = {
+ GNUNET_GETOPT_option_string ('d',
+ "dns",
+ "IP",
+ gettext_noop ("IP of recursive DNS resolver to use (required)"),
+ &dns_ip),
+ GNUNET_GETOPT_option_uint ('p',
+ "port",
+ "UDPPORT",
+ gettext_noop ("UDP port to listen on for inbound DNS requests; default: 2853"),
+ &listen_port),
GNUNET_GETOPT_OPTION_END
};
int ret;
- if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv,
- &argc, &argv))
+ if (GNUNET_OK !=
+ GNUNET_STRINGS_get_utf8_args (argc, argv,
+ &argc, &argv))
return 2;
- GNUNET_log_setup ("gnunet-dns2gns", "WARNING", NULL);
+ GNUNET_log_setup ("gnunet-dns2gns",
+ "WARNING",
+ NULL);
ret =
(GNUNET_OK ==
- GNUNET_PROGRAM_run (argc, argv, "gnunet-dns2gns",
+ GNUNET_PROGRAM_run (argc, argv,
+ "gnunet-dns2gns",
_("GNUnet DNS-to-GNS proxy (a DNS server)"),
options,
&run, NULL)) ? 0 : 1;
projects / oweals / gnunet.git / blobdiff