/*
This file is part of GNUnet.
- (C) 2012 Christian Grothoff (and other contributing authors)
+ (C) 2012-2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
#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"
/**
* Timeout for DNS requests.
*/
#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.
*/
*/
struct GNUNET_GNS_LookupRequest *lookup;
+ /**
+ * Our DNS request handle
+ */
+ struct GNUNET_DNSSTUB_RequestSocket *dns_lookup;
+
/**
* Task run on timeout or shutdown to clean up without
* response.
*/
struct GNUNET_GNS_Handle *gns;
+/**
+ * Stub resolver
+ */
+struct GNUNET_DNSSTUB_Context *dns_stub;
+
/**
* Listen socket for IPv4.
*/
*/
static GNUNET_SCHEDULER_TaskIdentifier 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;
+
+/**
+ * IP of DNS server
+ */
+static char *dns_ip;
+
+/**
+ * UDP Port we listen on for inbound DNS requests.
+ */
+static unsigned int listen_port = 53;
+
+/**
+ * Which GNS zone do we translate incoming DNS requests to?
+ */
+static struct GNUNET_CRYPTO_EccPublicSignKey my_zone;
+
+/**
+ * '-z' option with the main zone to use.
+ */
+static char *gns_zone_str;
+
+/**
+ * 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.
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;
+ }
GNUNET_GNS_disconnect (gns);
gns = NULL;
+ GNUNET_DNSSTUB_stop (dns_stub);
+ dns_stub = NULL;
}
if (NULL != request->packet)
GNUNET_DNSPARSER_free_packet (request->packet);
if (NULL != request->lookup)
- GNUNET_GNS_cancel_lookup_request (request->lookup);
+ GNUNET_GNS_lookup_cancel (request->lookup);
+ if (NULL != request->dns_lookup)
+ GNUNET_DNSSTUB_resolve_cancel (request->dns_lookup);
GNUNET_free (request);
}
/**
- * Iterator called on obtained result for a GNS
- * lookup
+ * 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);
+ send_response (request);
+}
+
+
+/**
+ * Iterator called on obtained result for a GNS lookup.
*
* @param cls closure
- * @param name "name" of the original lookup
- * @param rd_count number of records
+ * @param rd_count number of records in @a rd
* @param rd the records in reply
*/
static void
request->lookup = NULL;
packet = request->packet;
packet->flags.query_or_response = 1;
- packet->flags.return_code = GNUNET_DNSPARSER_RETURN_CODE_NO_ERROR;
+ packet->flags.return_code = GNUNET_TUN_DNS_RETURN_CODE_NO_ERROR;
packet->flags.checking_disabled = 0;
packet->flags.authenticated_data = 1;
packet->flags.zero = 0;
packet->flags.recursion_available = 1;
packet->flags.message_truncated = 0;
packet->flags.authoritative_answer = 0;
- packet->flags.opcode = GNUNET_DNSPARSER_OPCODE_STATUS; // ???
+ //packet->flags.opcode = GNUNET_TUN_DNS_OPCODE_STATUS; // ???
for (i=0;i<rd_count;i++)
{
+ // FIXME: do we need to hanlde #GNUNET_NAMESTORE_RF_SHADOW_RECORD
+ // here? Or should we do this in libgnunetgns?
+ rec.expiration_time.abs_value_us = rd[i].expiration_time;
switch (rd[i].record_type)
{
case GNUNET_DNSPARSER_TYPE_A:
GNUNET_assert (sizeof (struct in_addr) == rd[i].data_size);
rec.name = GNUNET_strdup (packet->queries[0].name);
- rec.data.raw.data = GNUNET_malloc (sizeof (struct in_addr));
+ rec.class = GNUNET_TUN_DNS_CLASS_INTERNET;
+ rec.type = GNUNET_DNSPARSER_TYPE_A;
+ rec.data.raw.data = GNUNET_new (struct in_addr);
memcpy (rec.data.raw.data,
rd[i].data,
rd[i].data_size);
break;
case GNUNET_DNSPARSER_TYPE_AAAA:
GNUNET_assert (sizeof (struct in6_addr) == rd[i].data_size);
- rec.name = GNUNET_strdup ("foo"); // request->name
+ rec.name = GNUNET_strdup (packet->queries[0].name);
rec.data.raw.data = GNUNET_malloc (sizeof (struct in6_addr));
+ rec.class = GNUNET_TUN_DNS_CLASS_INTERNET;
+ rec.type = GNUNET_DNSPARSER_TYPE_AAAA;
memcpy (rec.data.raw.data,
rd[i].data,
rd[i].data_size);
rec);
break;
case GNUNET_DNSPARSER_TYPE_CNAME:
- GNUNET_break (0); // FIXME: not implemented!
+ rec.name = GNUNET_strdup (packet->queries[0].name);
+ rec.data.hostname = strdup (rd[i].data);
+ rec.class = GNUNET_TUN_DNS_CLASS_INTERNET;
+ rec.type = GNUNET_DNSPARSER_TYPE_CNAME;
+ memcpy (rec.data.hostname,
+ rd[i].data,
+ rd[i].data_size);
+ GNUNET_array_append (packet->answers,
+ packet->num_answers,
+ rec);
break;
default:
/* skip */
*
* @param lsock socket to use for sending the reply
* @param addr address to use for sending the reply
- * @param addr_len number of bytes in addr
+ * @param addr_len number of bytes in @a addr
* @param udp_msg DNS request payload
- * @param udp_msg_size number of bytes in udp_msg
+ * @param udp_msg_size number of bytes in @a udp_msg
*/
static void
handle_request (struct GNUNET_NETWORK_Handle *lsock,
struct GNUNET_DNSPARSER_Packet *packet;
char *name;
size_t name_len;
- enum GNUNET_GNS_RecordType type;
+ int type;
+ int use_gns;
packet = GNUNET_DNSPARSER_parse (udp_msg, udp_msg_size);
if (NULL == packet)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Received malformed DNS request from %s\n"),
+ _("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,
+ (unsigned int) packet->flags.query_or_response,
+ (int) packet->num_answers,
+ (int) packet->num_authority_records,
+ (int) packet->num_additional_records);
if ( (0 != packet->flags.query_or_response) ||
(0 != packet->num_answers) ||
- (0 != packet->num_authority_records) ||
- (0 != packet->num_additional_records) )
+ (0 != packet->num_authority_records))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Received malformed DNS request from %s\n"),
request);
name = GNUNET_strdup (packet->queries[0].name);
name_len = strlen (name);
- if ( (name_len > strlen (".zkey.eu")) &&
- (0 == strcasecmp (".zkey.eu",
- &name[name_len - strlen (".zkey.eu")])) )
- {
- name[name_len - strlen (".zkey.eu")] = '\0';
- strcat (name, ".gnunet"); /* little hack, only works because
- ".zkey.eu" is longer than ".gnunet" */
- name_len = strlen (name);
- }
- if ( (name_len > strlen (".gnunet")) &&
- (0 == strcasecmp (".gnunet",
- &name[name_len - strlen (".gnunet")])) )
- {
- type = packet->queries[0].type;
- request->lookup = GNUNET_GNS_lookup (gns,
- name,
- type,
- GNUNET_NO,
- NULL,
- &result_processor,
- request);
- }
+ 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
- {
- /* FIXME: do traditional *DNS* lookup; note that
- gnunet-service-dns already has code to do this;
- factor into library to share! */
- GNUNET_break (0);
- }
+ {
+ 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);
}
/**
- * 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 cfg configuration
+ * Start DNS daemon.
*/
static void
-run (void *cls, char *const *args, const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *cfg)
+run_dnsd ()
{
- gns = GNUNET_GNS_connect (cfg);
- if (NULL == gns)
+ if (NULL == dns_suffix)
+ dns_suffix = DNS_SUFFIX;
+ if (NULL == fcfs_suffix)
+ fcfs_suffix = FCFS_SUFFIX;
+ if (NULL == (gns = GNUNET_GNS_connect (cfg)))
+ return;
+ if (NULL == (dns_stub = GNUNET_DNSSTUB_start (dns_ip)))
+ {
+ GNUNET_GNS_disconnect (gns);
+ gns = NULL;
return;
+ }
listen_socket4 = GNUNET_NETWORK_socket_create (PF_INET,
SOCK_DGRAM,
IPPROTO_UDP);
#if HAVE_SOCKADDR_IN_SIN_LEN
v4.sin_len = sizeof (v4);
#endif
- v4.sin_port = htons (53);
+ v4.sin_port = htons (listen_port);
if (GNUNET_OK !=
GNUNET_NETWORK_socket_bind (listen_socket4,
(struct sockaddr *) &v4,
- sizeof (v4)))
+ sizeof (v4),
+ 0))
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
GNUNET_NETWORK_socket_close (listen_socket4);
#if HAVE_SOCKADDR_IN_SIN_LEN
v6.sin6_len = sizeof (v6);
#endif
- v6.sin6_port = htons (53);
+ v6.sin6_port = htons (listen_port);
if (GNUNET_OK !=
GNUNET_NETWORK_socket_bind (listen_socket6,
(struct sockaddr *) &v6,
- sizeof (v6)))
+ sizeof (v6),
+ 0))
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
GNUNET_NETWORK_socket_close (listen_socket6);
}
if ( (NULL == listen_socket4) &&
(NULL == listen_socket6) )
- return;
+ {
+ GNUNET_GNS_disconnect (gns);
+ gns = NULL;
+ GNUNET_DNSSTUB_stop (dns_stub);
+ dns_stub = NULL;
+ return;
+ }
if (NULL != listen_socket4)
t4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
listen_socket4,
&read_dns6,
listen_socket6);
+}
+
+
+/**
+ * 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_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
&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_ecc_public_sign_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 fcfs daemon.
+ * The main function for the dns2gns daemon.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
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: 53"), 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},
GNUNET_GETOPT_OPTION_END
};
int ret;
_("GNUnet DNS-to-GNS proxy (a DNS server)"),
options,
&run, NULL)) ? 0 : 1;
-
+ GNUNET_free ((void*) argv);
return ret;
}
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