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- /*
- 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 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
- 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/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file gnunet-dns2gns.c
- * @brief DNS server that translates DNS requests to GNS
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include <gnunet_util_lib.h>
- #include <gnunet_dnsparser_lib.h>
- #include <gnunet_gns_service.h>
- #include <gnunet_dnsstub_lib.h>
- #include "gns.h"
- /**
- * Timeout for DNS requests.
- */
- #define TIMEOUT GNUNET_TIME_UNIT_MINUTES
- /**
- * Data kept per request.
- */
- struct Request
- {
- /**
- * Socket to use for sending the reply.
- */
- struct GNUNET_NETWORK_Handle *lsock;
- /**
- * Destination address to use.
- */
- const void *addr;
- /**
- * Initially, this is the DNS request, it will then be
- * converted to the DNS response.
- */
- struct GNUNET_DNSPARSER_Packet *packet;
- /**
- * Our GNS request handle.
- */
- struct GNUNET_GNS_LookupWithTldRequest *lookup;
- /**
- * Our DNS request handle
- */
- struct GNUNET_DNSSTUB_RequestSocket *dns_lookup;
- /**
- * Task run on timeout or shutdown to clean up without
- * response.
- */
- struct GNUNET_SCHEDULER_Task *timeout_task;
- /**
- * 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;
- };
- /**
- * The address to bind to
- */
- static in_addr_t address;
- /**
- * The IPv6 address to bind to
- */
- static struct in6_addr address6;
- /**
- * Handle to GNS resolver.
- */
- struct GNUNET_GNS_Handle *gns;
- /**
- * Stub resolver
- */
- struct GNUNET_DNSSTUB_Context *dns_stub;
- /**
- * Listen socket for IPv4.
- */
- static struct GNUNET_NETWORK_Handle *listen_socket4;
- /**
- * Listen socket for IPv6.
- */
- static struct GNUNET_NETWORK_Handle *listen_socket6;
- /**
- * Task for IPv4 socket.
- */
- static struct GNUNET_SCHEDULER_Task *t4;
- /**
- * Task for IPv6 socket.
- */
- static struct GNUNET_SCHEDULER_Task *t6;
- /**
- * IP of DNS server
- */
- static char *dns_ip;
- /**
- * UDP Port we listen on for inbound DNS requests.
- */
- static unsigned int listen_port = 53;
- /**
- * Configuration to use.
- */
- static const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Task run on shutdown. Cleans up everything.
- *
- * @param cls unused
- */
- static void
- do_shutdown (void *cls)
- {
- (void) cls;
- if (NULL != t4)
- {
- GNUNET_SCHEDULER_cancel (t4);
- t4 = NULL;
- }
- if (NULL != t6)
- {
- GNUNET_SCHEDULER_cancel (t6);
- t6 = NULL;
- }
- if (NULL != listen_socket4)
- {
- GNUNET_NETWORK_socket_close (listen_socket4);
- listen_socket4 = NULL;
- }
- if (NULL != listen_socket6)
- {
- GNUNET_NETWORK_socket_close (listen_socket6);
- listen_socket6 = NULL;
- }
- if (NULL != gns)
- {
- GNUNET_GNS_disconnect (gns);
- gns = NULL;
- }
- if (NULL != dns_stub)
- {
- GNUNET_DNSSTUB_stop (dns_stub);
- dns_stub = NULL;
- }
- }
- /**
- * Send the response for the given request and clean up.
- *
- * @param request context for the request.
- */
- static void
- send_response (struct Request *request)
- {
- char *buf;
- size_t size;
- ssize_t sret;
- if (GNUNET_SYSERR ==
- GNUNET_DNSPARSER_pack (request->packet,
- UINT16_MAX /* is this not too much? */,
- &buf,
- &size))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _ ("Failed to pack DNS response into UDP packet!\n"));
- }
- else
- {
- 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);
- }
- /**
- * Task run on timeout. Cleans up request.
- *
- * @param cls `struct Request *` of the request to clean up
- */
- static void
- do_timeout (void *cls)
- {
- struct Request *request = cls;
- if (NULL != request->packet)
- GNUNET_DNSPARSER_free_packet (request->packet);
- if (NULL != 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 dns the DNS udp payload
- * @param r size of the DNS payload
- */
- static void
- dns_result_processor (void *cls,
- const struct GNUNET_TUN_DnsHeader *dns,
- size_t r)
- {
- struct Request *request = cls;
- 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;
- 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.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_TUN_DNS_OPCODE_STATUS; // ???
- 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?
- 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.dns_traffic_class = GNUNET_TUN_DNS_CLASS_INTERNET;
- rec.type = GNUNET_DNSPARSER_TYPE_A;
- rec.data.raw.data = GNUNET_new (struct in_addr);
- GNUNET_memcpy (rec.data.raw.data,
- rd[i].data,
- rd[i].data_size);
- rec.data.raw.data_len = sizeof(struct in_addr);
- GNUNET_array_append (packet->answers,
- packet->num_answers,
- rec);
- break;
- case GNUNET_DNSPARSER_TYPE_AAAA:
- GNUNET_assert (sizeof(struct in6_addr) == rd[i].data_size);
- rec.name = GNUNET_strdup (packet->queries[0].name);
- rec.data.raw.data = GNUNET_new (struct in6_addr);
- rec.dns_traffic_class = GNUNET_TUN_DNS_CLASS_INTERNET;
- rec.type = GNUNET_DNSPARSER_TYPE_AAAA;
- GNUNET_memcpy (rec.data.raw.data,
- rd[i].data,
- rd[i].data_size);
- rec.data.raw.data_len = sizeof(struct in6_addr);
- GNUNET_array_append (packet->answers,
- packet->num_answers,
- rec);
- break;
- case GNUNET_DNSPARSER_TYPE_CNAME:
- rec.name = GNUNET_strdup (packet->queries[0].name);
- rec.data.hostname = GNUNET_strdup (rd[i].data);
- rec.dns_traffic_class = GNUNET_TUN_DNS_CLASS_INTERNET;
- rec.type = GNUNET_DNSPARSER_TYPE_CNAME;
- GNUNET_memcpy (rec.data.hostname,
- rd[i].data,
- rd[i].data_size);
- GNUNET_array_append (packet->answers,
- packet->num_answers,
- rec);
- break;
- default:
- /* skip */
- break;
- }
- }
- send_response (request);
- }
- /**
- * Handle DNS request.
- *
- * @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 @a addr
- * @param udp_msg DNS request payload
- * @param udp_msg_size number of bytes in @a udp_msg
- */
- static void
- handle_request (struct GNUNET_NETWORK_Handle *lsock,
- const void *addr,
- size_t addr_len,
- const char *udp_msg,
- size_t udp_msg_size)
- {
- struct Request *request;
- struct GNUNET_DNSPARSER_Packet *packet;
- 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_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))
- {
- 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;
- }
- 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);
- 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);
- 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);
- }
- /**
- * Task to read IPv4 DNS packets.
- *
- * @param cls the 'listen_socket4'
- */
- static void
- read_dns4 (void *cls)
- {
- struct sockaddr_in v4;
- socklen_t addrlen;
- ssize_t size;
- const struct GNUNET_SCHEDULER_TaskContext *tc;
- GNUNET_assert (listen_socket4 == cls);
- t4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- listen_socket4,
- &read_dns4,
- listen_socket4);
- tc = GNUNET_SCHEDULER_get_task_context ();
- if (0 == (GNUNET_SCHEDULER_REASON_READ_READY & tc->reason))
- return; /* shutdown? */
- size = GNUNET_NETWORK_socket_recvfrom_amount (listen_socket4);
- if (0 > size)
- {
- GNUNET_break (0);
- return; /* read error!? */
- }
- {
- char buf[size + 1];
- ssize_t sret;
- addrlen = sizeof(v4);
- 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,
- buf,
- size);
- }
- }
- /**
- * Task to read IPv6 DNS packets.
- *
- * @param cls the 'listen_socket6'
- */
- static void
- read_dns6 (void *cls)
- {
- struct sockaddr_in6 v6;
- socklen_t addrlen;
- ssize_t size;
- const struct GNUNET_SCHEDULER_TaskContext *tc;
- GNUNET_assert (listen_socket6 == cls);
- t6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- listen_socket6,
- &read_dns6,
- listen_socket6);
- tc = GNUNET_SCHEDULER_get_task_context ();
- if (0 == (GNUNET_SCHEDULER_REASON_READ_READY & tc->reason))
- return; /* shutdown? */
- size = GNUNET_NETWORK_socket_recvfrom_amount (listen_socket6);
- if (0 > size)
- {
- GNUNET_break (0);
- return; /* read error!? */
- }
- {
- char buf[size];
- ssize_t sret;
- addrlen = sizeof(v6);
- 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);
- }
- }
- /**
- * 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)
- {
- char *addr_str;
- (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;
- 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;
- }
- /* Get address to bind to */
- if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (c, "dns2gns",
- "BIND_TO",
- &addr_str))
- {
- // No address specified
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Don't know what to bind to...\n");
- GNUNET_free (addr_str);
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- if (1 != inet_pton (AF_INET, addr_str, &address))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Unable to parse address %s\n",
- addr_str);
- GNUNET_free (addr_str);
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- GNUNET_free (addr_str);
- /* Get address to bind to */
- if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (c, "dns2gns",
- "BIND_TO6",
- &addr_str))
- {
- // No address specified
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Don't know what to bind6 to...\n");
- GNUNET_free (addr_str);
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- if (1 != inet_pton (AF_INET6, addr_str, &address6))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Unable to parse IPv6 address %s\n",
- addr_str);
- GNUNET_free (addr_str);
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- GNUNET_free (addr_str);
- listen_socket4 = GNUNET_NETWORK_socket_create (PF_INET,
- SOCK_DGRAM,
- IPPROTO_UDP);
- if (NULL != listen_socket4)
- {
- struct sockaddr_in v4;
- memset (&v4, 0, sizeof(v4));
- v4.sin_family = AF_INET;
- v4.sin_addr.s_addr = address;
- #if HAVE_SOCKADDR_IN_SIN_LEN
- v4.sin_len = sizeof(v4);
- #endif
- v4.sin_port = htons (listen_port);
- if (GNUNET_OK !=
- GNUNET_NETWORK_socket_bind (listen_socket4,
- (struct sockaddr *) &v4,
- sizeof(v4)))
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
- GNUNET_NETWORK_socket_close (listen_socket4);
- listen_socket4 = NULL;
- }
- }
- listen_socket6 = GNUNET_NETWORK_socket_create (PF_INET6,
- SOCK_DGRAM,
- IPPROTO_UDP);
- if (NULL != listen_socket6)
- {
- struct sockaddr_in6 v6;
- memset (&v6, 0, sizeof(v6));
- v6.sin6_family = AF_INET6;
- v6.sin6_addr = address6;
- #if HAVE_SOCKADDR_IN_SIN_LEN
- v6.sin6_len = sizeof(v6);
- #endif
- v6.sin6_port = htons (listen_port);
- if (GNUNET_OK !=
- GNUNET_NETWORK_socket_bind (listen_socket6,
- (struct sockaddr *) &v6,
- sizeof(v6)))
- {
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
- GNUNET_NETWORK_socket_close (listen_socket6);
- listen_socket6 = NULL;
- }
- }
- if ((NULL == listen_socket4) &&
- (NULL == listen_socket6))
- {
- 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_dns4,
- listen_socket4);
- if (NULL != listen_socket6)
- t6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- listen_socket6,
- &read_dns6,
- listen_socket6);
- }
- /**
- * The main function for the dns2gns daemon.
- *
- * @param argc number of arguments from the command line
- * @param argv command line arguments
- * @return 0 ok, 1 on error
- */
- int
- main (int argc,
- char *const *argv)
- {
- 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))
- return 2;
- GNUNET_log_setup ("gnunet-dns2gns",
- "WARNING",
- NULL);
- ret =
- (GNUNET_OK ==
- GNUNET_PROGRAM_run (argc, argv,
- "gnunet-dns2gns",
- _ ("GNUnet DNS-to-GNS proxy (a DNS server)"),
- options,
- &run, NULL)) ? 0 : 1;
- GNUNET_free ((void *) argv);
- return ret;
- }
- /* end of gnunet-dns2gns.c */
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