2 This file is part of GNUnet.
3 (C) 2012-2013 Christian Grothoff (and other contributing authors)
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21 * @file gnunet-namestore-fcfsd.c
22 * @brief HTTP daemon that offers first-come-first-serve GNS domain registration
23 * @author Christian Grothoff
26 * - need to track active zone info requests so we can cancel them
27 * during shutdown, right?
28 * - the code currently contains a 'race' between checking that the
29 * domain name is available and allocating it to the new public key
30 * (should this race be solved by namestore or by fcfsd?)
31 * - nicer error reporting to browser
34 #include <microhttpd.h>
35 #include "gnunet_util_lib.h"
36 #include "gnunet_identity_service.h"
37 #include "gnunet_gnsrecord_lib.h"
38 #include "gnunet_namestore_service.h"
41 * Invalid method page.
43 #define METHOD_ERROR "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"><html lang=\"en\" xmlns=\"http://www.w3.org/1999/xhtml\"><html><head><title>Illegal request</title></head><body>Go away.</body></html>"
48 #define MAIN_PAGE "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"><html lang=\"en\" xmlns=\"http://www.w3.org/1999/xhtml\"><html><head><title>GNUnet FCFS Authority Name Registration Service</title></head><body><form action=\"S\" method=\"post\">What is your desired domain name? (at most 63 lowercase characters, no dots allowed.) <input type=\"text\" name=\"domain\" /> <p> What is your public key? (Copy from gnunet-setup.) <input type=\"text\" name=\"pkey\" /> <input type=\"submit\" value=\"Next\" /><br/><a href=./Zoneinfo> List of all registered names </a></body></html>"
53 #define SUBMIT_PAGE "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"><html lang=\"en\" xmlns=\"http://www.w3.org/1999/xhtml\"><html><head><title>%s</title></head><body>%s</body></html>"
56 * Fcfs zoneinfo page (/Zoneinfo)
58 #define ZONEINFO_PAGE "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"><html lang=\"en\" xmlns=\"http://www.w3.org/1999/xhtml\"><html><head><title>FCFS Zoneinfo</title></head><body><h1> FCFS Zoneinfo </h1><table border=\"1\"><th>name</th><th>PKEY</th>%s</table></body></html>"
60 #define FCFS_ZONEINFO_URL "/Zoneinfo"
63 * Mime type for HTML pages.
65 #define MIME_HTML "text/html"
70 #define COOKIE_NAME "namestore-fcfsd"
72 #define DEFAULT_ZONEINFO_BUFSIZE 2048
75 * Phases a request goes through.
80 * Start phase (parsing POST, checking).
85 * Lookup to see if the domain name is taken.
90 * Storing of the record.
95 * We're done with success.
100 * Send failure message.
107 * Data kept per request.
113 * Associated session.
115 struct Session *session;
118 * Post processor handling form data (IF this is
121 struct MHD_PostProcessor *pp;
124 * URL to serve in response to this POST (if this request
127 const char *post_url;
130 * Active request with the namestore.
132 struct GNUNET_NAMESTORE_QueueEntry *qe;
135 * Active iteration with the namestore.
137 struct GNUNET_NAMESTORE_ZoneIterator *zi;
140 * Current processing phase.
145 * Domain name submitted via form.
147 char domain_name[64];
150 * Public key submitted via form.
152 char public_key[128];
159 struct ZoneinfoRequest
164 struct MHD_Connection *connection;
169 struct GNUNET_NAMESTORE_ZoneIterator *list_it;
182 * Buffer write offset
188 * MHD deamon reference.
190 static struct MHD_Daemon *httpd;
195 static GNUNET_SCHEDULER_TaskIdentifier httpd_task;
198 * Handle to the namestore.
200 static struct GNUNET_NAMESTORE_Handle *ns;
203 * Private key for the fcfsd zone.
205 static struct GNUNET_CRYPTO_EcdsaPrivateKey fcfs_zone_pkey;
208 * Connection to identity service.
210 static struct GNUNET_IDENTITY_Handle *identity;
213 * Request for our ego.
215 static struct GNUNET_IDENTITY_Operation *id_op;
218 * Port we use for the HTTP server.
220 static unsigned long long port;
224 * Task run whenever HTTP server operations are pending.
227 * @param tc scheduler context
231 const struct GNUNET_SCHEDULER_TaskContext *tc);
235 * Schedule task to run MHD server now.
240 if (GNUNET_SCHEDULER_NO_TASK != httpd_task)
242 GNUNET_SCHEDULER_cancel (httpd_task);
243 httpd_task = GNUNET_SCHEDULER_NO_TASK;
245 httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd, NULL);
250 iterate_cb (void *cls,
251 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
254 const struct GNUNET_GNSRECORD_Data *rd)
256 struct ZoneinfoRequest *zr = cls;
257 struct MHD_Response *response;
268 /* return static form */
269 GNUNET_asprintf (&full_page,
273 response = MHD_create_response_from_buffer (strlen (full_page),
275 MHD_RESPMEM_MUST_FREE);
276 MHD_add_response_header (response,
277 MHD_HTTP_HEADER_CONTENT_TYPE,
279 MHD_queue_response (zr->connection,
282 MHD_destroy_response (response);
283 GNUNET_free (zr->zoneinfo);
291 GNUNET_NAMESTORE_zone_iterator_next (zr->list_it);
295 if (GNUNET_GNSRECORD_TYPE_PKEY != rd->record_type)
297 GNUNET_NAMESTORE_zone_iterator_next (zr->list_it);
301 bytes_free = zr->buf_len - zr->write_offset;
302 pkey = GNUNET_GNSRECORD_value_to_string (rd->record_type,
306 if (bytes_free < (strlen (name) + strlen (pkey) + 40))
308 new_buf = GNUNET_malloc (zr->buf_len * 2);
309 memcpy (new_buf, zr->zoneinfo, zr->write_offset);
310 GNUNET_free (zr->zoneinfo);
311 zr->zoneinfo = new_buf;
314 sprintf (zr->zoneinfo + zr->write_offset,
315 "<tr><td>%s</td><td>%s</td></tr>",
318 zr->write_offset = strlen (zr->zoneinfo);
319 GNUNET_NAMESTORE_zone_iterator_next (zr->list_it);
326 * Handler that returns FCFS zoneinfo page.
328 * @param connection connection to use
329 * @return MHD_YES on success
332 serve_zoneinfo_page (struct MHD_Connection *connection)
334 struct ZoneinfoRequest *zr;
336 zr = GNUNET_new (struct ZoneinfoRequest);
337 zr->zoneinfo = GNUNET_malloc (DEFAULT_ZONEINFO_BUFSIZE);
338 zr->buf_len = DEFAULT_ZONEINFO_BUFSIZE;
339 zr->connection = connection;
340 zr->write_offset = 0;
341 zr->list_it = GNUNET_NAMESTORE_zone_iteration_start (ns,
350 * Handler that returns a simple static HTTP page.
352 * @param connection connection to use
353 * @return MHD_YES on success
356 serve_main_page (struct MHD_Connection *connection)
359 struct MHD_Response *response;
361 /* return static form */
362 response = MHD_create_response_from_buffer (strlen (MAIN_PAGE),
364 MHD_RESPMEM_PERSISTENT);
365 MHD_add_response_header (response,
366 MHD_HTTP_HEADER_CONTENT_TYPE,
368 ret = MHD_queue_response (connection,
371 MHD_destroy_response (response);
377 * Send the 'SUBMIT_PAGE'.
379 * @param info information string to send to the user
380 * @param request request information
381 * @param connection connection to use
384 fill_s_reply (const char *info,
385 struct Request *request,
386 struct MHD_Connection *connection)
390 struct MHD_Response *response;
392 GNUNET_asprintf (&reply,
396 /* return static form */
397 response = MHD_create_response_from_buffer (strlen (reply),
399 MHD_RESPMEM_MUST_FREE);
400 MHD_add_response_header (response,
401 MHD_HTTP_HEADER_CONTENT_TYPE,
403 ret = MHD_queue_response (connection,
406 MHD_destroy_response (response);
412 * Iterator over key-value pairs where the value
413 * maybe made available in increments and/or may
414 * not be zero-terminated. Used for processing
417 * @param cls user-specified closure
418 * @param kind type of the value
419 * @param key 0-terminated key for the value
420 * @param filename name of the uploaded file, NULL if not known
421 * @param content_type mime-type of the data, NULL if not known
422 * @param transfer_encoding encoding of the data, NULL if not known
423 * @param data pointer to size bytes of data at the
425 * @param off offset of data in the overall value
426 * @param size number of bytes in data available
427 * @return MHD_YES to continue iterating,
428 * MHD_NO to abort the iteration
431 post_iterator (void *cls,
432 enum MHD_ValueKind kind,
434 const char *filename,
435 const char *content_type,
436 const char *transfer_encoding,
437 const char *data, uint64_t off, size_t size)
439 struct Request *request = cls;
441 if (0 == strcmp ("domain", key))
443 if (size + off >= sizeof(request->domain_name))
444 size = sizeof (request->domain_name) - off - 1;
445 memcpy (&request->domain_name[off],
448 request->domain_name[size+off] = '\0';
451 if (0 == strcmp ("pkey", key))
453 if (size + off >= sizeof(request->public_key))
454 size = sizeof (request->public_key) - off - 1;
455 memcpy (&request->public_key[off],
458 request->public_key[size+off] = '\0';
461 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
462 _("Unsupported form value `%s'\n"),
469 * Continuation called to notify client about result of the
473 * @param success #GNUNET_SYSERR on failure (including timeout/queue drop/failure to validate)
474 * #GNUNET_NO if content was already there
475 * #GNUNET_YES (or other positive value) on success
476 * @param emsg NULL on success, otherwise an error message
479 put_continuation (void *cls,
483 struct Request *request = cls;
488 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
489 _("Failed to create record for domain `%s': %s\n"),
490 request->domain_name,
492 request->phase = RP_FAIL;
495 request->phase = RP_SUCCESS;
501 * Test if a name mapping was found, if so, refuse. If not, initiate storing of the record.
504 * @param zone_key public key of the zone
505 * @param name name that is being mapped (at most 255 characters long)
506 * @param rd_count number of entries in @a rd array
507 * @param rd array of records with data to store
510 zone_to_name_cb (void *cls,
511 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
513 unsigned int rd_count,
514 const struct GNUNET_GNSRECORD_Data *rd)
516 struct Request *request = cls;
517 struct GNUNET_GNSRECORD_Data r;
518 struct GNUNET_CRYPTO_EcdsaPublicKey pub;
523 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
524 _("Found existing name `%s' for the given key\n"),
526 request->phase = RP_FAIL;
530 GNUNET_CRYPTO_ecdsa_key_get_public (zone_key,
533 r.data_size = sizeof (pub);
534 r.expiration_time = UINT64_MAX;
535 r.record_type = GNUNET_GNSRECORD_TYPE_PKEY;
536 r.flags = GNUNET_GNSRECORD_RF_NONE;
537 request->qe = GNUNET_NAMESTORE_records_store (ns,
539 request->domain_name,
547 * We got a block back from the namestore. Decrypt it
548 * and continue to process the result.
550 * @param cls the 'struct Request' we are processing
551 * @param zone private key of the zone; NULL on disconnect
552 * @param label label of the records; NULL on disconnect
553 * @param rd_count number of entries in @a rd array, 0 if label was deleted
554 * @param rd array of records with data to store
557 lookup_block_processor (void *cls,
558 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
560 unsigned int rd_count,
561 const struct GNUNET_GNSRECORD_Data *rd)
563 struct Request *request = cls;
564 struct GNUNET_CRYPTO_EcdsaPublicKey pub;
571 GNUNET_CRYPTO_ecdsa_public_key_from_string (request->public_key,
572 strlen (request->public_key),
576 request->phase = RP_FAIL;
580 request->qe = GNUNET_NAMESTORE_zone_to_name (ns,
587 if (0 != strcmp (label,
588 request->domain_name))
590 GNUNET_NAMESTORE_zone_iterator_next (request->zi);
593 GNUNET_NAMESTORE_zone_iteration_stop (request->zi);
595 GNUNET_break (0 != rd_count);
596 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
597 _("Found %u existing records for domain `%s'\n"),
599 request->domain_name);
600 request->phase = RP_FAIL;
607 * Main MHD callback for handling requests.
610 * @param connection MHD connection handle
611 * @param url the requested url
612 * @param method the HTTP method used ("GET", "PUT", etc.)
613 * @param version the HTTP version string (i.e. "HTTP/1.1")
614 * @param upload_data the data being uploaded (excluding HEADERS,
615 * for a POST that fits into memory and that is encoded
616 * with a supported encoding, the POST data will NOT be
617 * given in upload_data and is instead available as
618 * part of MHD_get_connection_values; very large POST
619 * data *will* be made available incrementally in
621 * @param upload_data_size set initially to the size of the
622 * @a upload_data provided; the method must update this
623 * value to the number of bytes NOT processed;
624 * @param ptr pointer to location where we store the 'struct Request'
625 * @return MHD_YES if the connection was handled successfully,
626 * MHD_NO if the socket must be closed due to a serious
627 * error while handling the request
630 create_response (void *cls,
631 struct MHD_Connection *connection,
635 const char *upload_data,
636 size_t *upload_data_size,
639 struct MHD_Response *response;
640 struct Request *request;
641 struct GNUNET_CRYPTO_EcdsaPublicKey pub;
644 if ( (0 == strcmp (method, MHD_HTTP_METHOD_GET)) ||
645 (0 == strcmp (method, MHD_HTTP_METHOD_HEAD)) )
647 if (0 == strcmp (url, FCFS_ZONEINFO_URL))
648 ret = serve_zoneinfo_page (connection);
650 ret = serve_main_page (connection);
652 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
653 _("Failed to create page for `%s'\n"),
657 if (0 == strcmp (method, MHD_HTTP_METHOD_POST))
662 request = GNUNET_malloc (sizeof (struct Request));
664 request->pp = MHD_create_post_processor (connection, 1024,
665 &post_iterator, request);
666 if (NULL == request->pp)
668 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
669 _("Failed to setup post processor for `%s'\n"),
671 return MHD_NO; /* internal error */
675 if (NULL != request->pp)
677 /* evaluate POST data */
678 MHD_post_process (request->pp,
681 if (0 != *upload_data_size)
683 *upload_data_size = 0;
686 /* done with POST data, serve response */
687 MHD_destroy_post_processor (request->pp);
691 GNUNET_CRYPTO_ecdsa_public_key_from_string (request->public_key,
692 strlen (request->public_key),
696 return fill_s_reply ("Failed to parse given public key",
697 request, connection);
699 switch (request->phase)
702 if (NULL != strchr (request->domain_name, (int) '.'))
704 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
705 _("Domain name must not contain `.'\n"));
706 request->phase = RP_FAIL;
707 return fill_s_reply ("Domain name must not contain `.', sorry.",
708 request, connection);
710 if (NULL != strchr (request->domain_name, (int) '+'))
712 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
713 _("Domain name must not contain `+'\n"));
714 request->phase = RP_FAIL;
715 return fill_s_reply ("Domain name must not contain `+', sorry.",
716 request, connection);
718 request->phase = RP_LOOKUP;
719 /* FIXME: would be nice to have a more efficient API for this */
720 request->zi = GNUNET_NAMESTORE_zone_iteration_start (ns,
722 &lookup_block_processor,
730 return fill_s_reply ("Request failed, sorry.",
731 request, connection);
733 return fill_s_reply ("Success.",
734 request, connection);
739 return MHD_YES; /* will have a reply later... */
741 /* unsupported HTTP method */
742 response = MHD_create_response_from_buffer (strlen (METHOD_ERROR),
743 (void *) METHOD_ERROR,
744 MHD_RESPMEM_PERSISTENT);
745 ret = MHD_queue_response (connection,
746 MHD_HTTP_METHOD_NOT_ACCEPTABLE,
748 MHD_destroy_response (response);
754 * Callback called upon completion of a request.
755 * Decrements session reference counter.
757 * @param cls not used
758 * @param connection connection that completed
759 * @param con_cls session handle
760 * @param toe status code
763 request_completed_callback (void *cls,
764 struct MHD_Connection *connection,
766 enum MHD_RequestTerminationCode toe)
768 struct Request *request = *con_cls;
772 if (NULL != request->pp)
773 MHD_destroy_post_processor (request->pp);
774 if (NULL != request->qe)
775 GNUNET_NAMESTORE_cancel (request->qe);
776 GNUNET_free (request);
780 #define UNSIGNED_MHD_LONG_LONG unsigned MHD_LONG_LONG
784 * Schedule tasks to run MHD server.
792 struct GNUNET_NETWORK_FDSet *wrs;
793 struct GNUNET_NETWORK_FDSet *wws;
794 struct GNUNET_NETWORK_FDSet *wes;
797 UNSIGNED_MHD_LONG_LONG timeout;
798 struct GNUNET_TIME_Relative tv;
803 wrs = GNUNET_NETWORK_fdset_create ();
804 wes = GNUNET_NETWORK_fdset_create ();
805 wws = GNUNET_NETWORK_fdset_create ();
807 GNUNET_assert (MHD_YES == MHD_get_fdset (httpd, &rs, &ws, &es, &max));
808 haveto = MHD_get_timeout (httpd, &timeout);
809 if (haveto == MHD_YES)
810 tv.rel_value_us = (uint64_t) timeout * 1000LL;
812 tv = GNUNET_TIME_UNIT_FOREVER_REL;
813 GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
814 GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
815 GNUNET_NETWORK_fdset_copy_native (wes, &es, max + 1);
817 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
820 GNUNET_NETWORK_fdset_destroy (wrs);
821 GNUNET_NETWORK_fdset_destroy (wws);
822 GNUNET_NETWORK_fdset_destroy (wes);
827 * Task run whenever HTTP server operations are pending.
830 * @param tc scheduler context
834 const struct GNUNET_SCHEDULER_TaskContext *tc)
836 httpd_task = GNUNET_SCHEDULER_NO_TASK;
843 * Task run on shutdown. Cleans up everything.
846 * @param tc scheduler context
849 do_shutdown (void *cls,
850 const struct GNUNET_SCHEDULER_TaskContext *tc)
852 if (GNUNET_SCHEDULER_NO_TASK != httpd_task)
854 GNUNET_SCHEDULER_cancel (httpd_task);
855 httpd_task = GNUNET_SCHEDULER_NO_TASK;
859 GNUNET_NAMESTORE_disconnect (ns);
864 MHD_stop_daemon (httpd);
869 GNUNET_IDENTITY_cancel (id_op);
872 if (NULL != identity)
874 GNUNET_IDENTITY_disconnect (identity);
881 * Method called to inform about the egos of this peer.
883 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
884 * this function is only called ONCE, and 'NULL' being passed in
885 * @a ego does indicate an error (i.e. name is taken or no default
886 * value is known). If @a ego is non-NULL and if '*ctx'
887 * is set in those callbacks, the value WILL be passed to a subsequent
888 * call to the identity callback of #GNUNET_IDENTITY_connect (if
889 * that one was not NULL).
891 * @param cls closure, NULL
892 * @param ego ego handle
893 * @param ctx context for application to store data for this ego
894 * (during the lifetime of this process, initially NULL)
895 * @param name name assigned by the user for this ego,
896 * NULL if the user just deleted the ego and it
897 * must thus no longer be used
900 identity_cb (void *cls,
901 struct GNUNET_IDENTITY_Ego *ego,
910 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
911 _("No ego configured for `fcfsd` subsystem\n"));
914 fcfs_zone_pkey = *GNUNET_IDENTITY_ego_get_private_key (ego);
916 options = MHD_USE_DUAL_STACK | MHD_USE_DEBUG;
919 httpd = MHD_start_daemon (options,
922 &create_response, NULL,
923 MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 128,
924 MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
925 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
926 MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (4 * 1024),
927 MHD_OPTION_NOTIFY_COMPLETED, &request_completed_callback, NULL,
929 if (MHD_USE_DEBUG == options)
931 options = MHD_USE_DEBUG;
933 while (NULL == httpd);
936 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
937 _("Failed to start HTTP server\n"));
938 GNUNET_SCHEDULER_shutdown ();
946 * Main function that will be run.
949 * @param args remaining command-line arguments
950 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
951 * @param cfg configuration
954 run (void *cls, char *const *args, const char *cfgfile,
955 const struct GNUNET_CONFIGURATION_Handle *cfg)
958 GNUNET_CONFIGURATION_get_value_number (cfg,
963 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
964 "fcfsd", "HTTPPORT");
967 ns = GNUNET_NAMESTORE_connect (cfg);
970 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
971 _("Failed to connect to namestore\n"));
974 identity = GNUNET_IDENTITY_connect (cfg,
976 id_op = GNUNET_IDENTITY_get (identity, "fcfsd",
978 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
984 * The main function for the fcfs daemon.
986 * @param argc number of arguments from the command line
987 * @param argv command line arguments
988 * @return 0 ok, 1 on error
991 main (int argc, char *const *argv)
993 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
994 GNUNET_GETOPT_OPTION_END
999 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
1002 GNUNET_log_setup ("fcfsd", "WARNING", NULL);
1005 GNUNET_PROGRAM_run (argc, argv, "fcfsd",
1006 _("GNU Name System First Come First Serve name registration service"),
1008 &run, NULL)) ? 0 : 1;
1009 GNUNET_free ((void*) argv);
1010 GNUNET_CRYPTO_ecdsa_key_clear (&fcfs_zone_pkey);
1014 /* end of gnunet-namestore-fcfsd.c */