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|
/*
This file is part of GNUnet.
(C) 2012 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
by the Free Software Foundation; either version 3, 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.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file gnunet-gns-fcfsd.c
* @brief HTTP daemon that offers first-come-first-serve GNS domain registration
* @author Christian Grothoff
*
* TODO:
* - the code currently contains a 'race' between checking that the
* domain name is available and allocating it to the new public key
* (should this race be solved by namestore or by fcfsd?)
* - nicer error reporting to browser
* - figure out where this binary should go (is gns the right directory!?)
*/
#include "platform.h"
#include <gnunet_util_lib.h>
#include <microhttpd.h>
#include <gnunet_namestore_service.h>
/**
* Invalid method page.
*/
#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>"
/**
* Front page. (/)
*/
#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? <input type=\"text\" name=\"domain\" /> <p> What is your public key? <input type=\"text\" name=\"pkey\" /> <input type=\"submit\" value=\"Next\" /></body></html>"
/**
* Second page (/S)
*/
#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>"
/**
* Mime type for HTML pages.
*/
#define MIME_HTML "text/html"
/**
* Name of our cookie.
*/
#define COOKIE_NAME "gns-fcfs"
/**
* Phases a request goes through.
*/
enum Phase
{
/**
* Start phase (parsing POST, checking).
*/
RP_START = 0,
/**
* Lookup to see if the domain name is taken.
*/
RP_LOOKUP,
/**
* Storing of the record.
*/
RP_PUT,
/**
* We're done with success.
*/
RP_SUCCESS,
/**
* Send failure message.
*/
RP_FAIL
};
/**
* Data kept per request.
*/
struct Request
{
/**
* Associated session.
*/
struct Session *session;
/**
* Post processor handling form data (IF this is
* a POST request).
*/
struct MHD_PostProcessor *pp;
/**
* URL to serve in response to this POST (if this request
* was a 'POST')
*/
const char *post_url;
/**
* Active request with the namestore.
*/
struct GNUNET_NAMESTORE_QueueEntry *qe;
/**
* Current processing phase.
*/
enum Phase phase;
/**
* Domain name submitted via form.
*/
char domain_name[64];
/**
* Public key submitted via form.
*/
char public_key[64];
};
/**
* MHD deamon reference.
*/
static struct MHD_Daemon *httpd;
/**
* Main HTTP task.
*/
static GNUNET_SCHEDULER_TaskIdentifier httpd_task;
/**
* Handle to the namestore.
*/
static struct GNUNET_NAMESTORE_Handle *ns;
/**
* Hash of the public key of the fcfsd zone.
*/
static struct GNUNET_CRYPTO_ShortHashCode fcfsd_zone;
/**
* Private key for the fcfsd zone.
*/
static struct GNUNET_CRYPTO_RsaPrivateKey *fcfs_zone_pkey;
/**
* Handler that returns a simple static HTTP page.
*
* @param connection connection to use
* @return MHD_YES on success
*/
static int
serve_main_page (struct MHD_Connection *connection)
{
int ret;
struct MHD_Response *response;
/* return static form */
response = MHD_create_response_from_buffer (strlen (MAIN_PAGE),
(void *) MAIN_PAGE,
MHD_RESPMEM_PERSISTENT);
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONTENT_TYPE,
MIME_HTML);
ret = MHD_queue_response (connection,
MHD_HTTP_OK,
response);
MHD_destroy_response (response);
return ret;
}
/**
* Send the 'SUBMIT_PAGE'.
*
* @param info information string to send to the user
* @param request request information
* @param connection connection to use
*/
static int
fill_s_reply (const char *info,
struct Request *request,
struct MHD_Connection *connection)
{
int ret;
char *reply;
struct MHD_Response *response;
GNUNET_asprintf (&reply,
SUBMIT_PAGE,
info,
info);
/* return static form */
response = MHD_create_response_from_buffer (strlen (reply),
(void *) reply,
MHD_RESPMEM_MUST_FREE);
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONTENT_TYPE,
MIME_HTML);
ret = MHD_queue_response (connection,
MHD_HTTP_OK,
response);
MHD_destroy_response (response);
return ret;
}
/**
* Iterator over key-value pairs where the value
* maybe made available in increments and/or may
* not be zero-terminated. Used for processing
* POST data.
*
* @param cls user-specified closure
* @param kind type of the value
* @param key 0-terminated key for the value
* @param filename name of the uploaded file, NULL if not known
* @param content_type mime-type of the data, NULL if not known
* @param transfer_encoding encoding of the data, NULL if not known
* @param data pointer to size bytes of data at the
* specified offset
* @param off offset of data in the overall value
* @param size number of bytes in data available
* @return MHD_YES to continue iterating,
* MHD_NO to abort the iteration
*/
static int
post_iterator (void *cls,
enum MHD_ValueKind kind,
const char *key,
const char *filename,
const char *content_type,
const char *transfer_encoding,
const char *data, uint64_t off, size_t size)
{
struct Request *request = cls;
if (0 == strcmp ("domain", key))
{
if (size + off >= sizeof(request->domain_name))
size = sizeof (request->domain_name) - off - 1;
memcpy (&request->domain_name[off],
data,
size);
request->domain_name[size+off] = '\0';
return MHD_YES;
}
if (0 == strcmp ("pkey", key))
{
if (size + off >= sizeof(request->public_key))
size = sizeof (request->public_key) - off - 1;
memcpy (&request->public_key[off],
data,
size);
request->public_key[size+off] = '\0';
return MHD_YES;
}
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Unsupported form value `%s'\n"),
key);
return MHD_YES;
}
/**
* Task run whenever HTTP server operations are pending.
*
* @param cls unused
* @param tc scheduler context
*/
static void
do_httpd (void *cls,
const struct GNUNET_SCHEDULER_TaskContext *tc);
/**
* Schedule task to run MHD server now.
*/
static void
run_httpd_now ()
{
if (GNUNET_SCHEDULER_NO_TASK != httpd_task)
{
GNUNET_SCHEDULER_cancel (httpd_task);
httpd_task = GNUNET_SCHEDULER_NO_TASK;
}
httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd, NULL);
}
/**
* Continuation called to notify client about result of the
* operation.
*
* @param cls closure
* @param success GNUNET_SYSERR on failure (including timeout/queue drop/failure to validate)
* GNUNET_NO if content was already there
* GNUNET_YES (or other positive value) on success
* @param emsg NULL on success, otherwise an error message
*/
static void
put_continuation (void *cls,
int32_t success,
const char *emsg)
{
struct Request *request = cls;
request->qe = NULL;
if (0 >= success)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Failed to create record for domain `%s': %s\n"),
request->domain_name,
emsg);
request->phase = RP_FAIL;
}
else
request->phase = RP_SUCCESS;
run_httpd_now ();
}
/**
* Test if a name mapping was found, if so, refuse. If not, initiate storing of the record.
*
* @param cls closure
* @param zone_key public key of the zone
* @param expire when does the corresponding block in the DHT expire (until
* when should we never do a DHT lookup for the same name again)?;
* GNUNET_TIME_UNIT_ZERO_ABS if there are no records of any type in the namestore,
* or the expiration time of the block in the namestore (even if there are zero
* records matching the desired record type)
* @param name name that is being mapped (at most 255 characters long)
* @param rd_count number of entries in 'rd' array
* @param rd array of records with data to store
* @param signature signature of the record block, NULL if signature is unavailable (i.e.
* because the user queried for a particular record type only)
*/
static void
zone_to_name_cb (void *cls,
const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key,
struct GNUNET_TIME_Absolute expire,
const char *name,
unsigned int rd_count,
const struct GNUNET_NAMESTORE_RecordData *rd,
const struct GNUNET_CRYPTO_RsaSignature *signature)
{
struct Request *request = cls;
struct GNUNET_NAMESTORE_RecordData r;
struct GNUNET_CRYPTO_ShortHashCode pub;
request->qe = NULL;
if (NULL != name)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("Found existing name `%s' for the given key\n"),
name);
request->phase = RP_FAIL;
run_httpd_now ();
return;
}
GNUNET_assert (GNUNET_OK ==
GNUNET_CRYPTO_short_hash_from_string2 (request->public_key,
strlen (request->public_key),
&pub));
r.data = &pub;
r.data_size = sizeof (pub);
r.expiration = GNUNET_TIME_UNIT_FOREVER_ABS;
r.record_type = GNUNET_NAMESTORE_TYPE_PKEY;
r.flags = GNUNET_NAMESTORE_RF_AUTHORITY;
request->qe = GNUNET_NAMESTORE_record_create (ns,
fcfs_zone_pkey,
request->domain_name,
&r,
&put_continuation,
request);
}
/**
* Process a record that was stored in the namestore. Used to check if
* the requested name already exists in the namestore. If not,
* proceed to check if the requested key already exists.
*
* @param cls closure
* @param zone_key public key of the zone
* @param expire when does the corresponding block in the DHT expire (until
* when should we never do a DHT lookup for the same name again)?;
* GNUNET_TIME_UNIT_ZERO_ABS if there are no records of any type in the namestore,
* or the expiration time of the block in the namestore (even if there are zero
* records matching the desired record type)
* @param name name that is being mapped (at most 255 characters long)
* @param rd_count number of entries in 'rd' array
* @param rd array of records with data to store
* @param signature signature of the record block, NULL if signature is unavailable (i.e.
* because the user queried for a particular record type only)
*/
static void
lookup_result_processor (void *cls,
const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key,
struct GNUNET_TIME_Absolute expire,
const char *name,
unsigned int rd_count,
const struct GNUNET_NAMESTORE_RecordData *rd,
const struct GNUNET_CRYPTO_RsaSignature *signature)
{
struct Request *request = cls;
struct GNUNET_CRYPTO_ShortHashCode pub;
request->qe = NULL;
GNUNET_assert (GNUNET_OK ==
GNUNET_CRYPTO_short_hash_from_string2 (request->public_key,
strlen (request->public_key),
&pub));
if (0 != rd_count)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("Found %u existing records for domain `%s'\n"),
rd_count,
request->domain_name);
request->phase = RP_FAIL;
run_httpd_now ();
return;
}
request->qe = GNUNET_NAMESTORE_zone_to_name (ns,
&fcfsd_zone,
&pub,
&zone_to_name_cb,
request);
}
/**
* Main MHD callback for handling requests.
*
* @param cls unused
* @param connection MHD connection handle
* @param url the requested url
* @param method the HTTP method used ("GET", "PUT", etc.)
* @param version the HTTP version string (i.e. "HTTP/1.1")
* @param upload_data the data being uploaded (excluding HEADERS,
* for a POST that fits into memory and that is encoded
* with a supported encoding, the POST data will NOT be
* given in upload_data and is instead available as
* part of MHD_get_connection_values; very large POST
* data *will* be made available incrementally in
* upload_data)
* @param upload_data_size set initially to the size of the
* upload_data provided; the method must update this
* value to the number of bytes NOT processed;
* @param ptr pointer to location where we store the 'struct Request'
* @return MHD_YES if the connection was handled successfully,
* MHD_NO if the socket must be closed due to a serious
* error while handling the request
*/
static int
create_response (void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **ptr)
{
struct MHD_Response *response;
struct Request *request;
int ret;
struct GNUNET_CRYPTO_ShortHashCode pub;
if ( (0 == strcmp (method, MHD_HTTP_METHOD_GET)) ||
(0 == strcmp (method, MHD_HTTP_METHOD_HEAD)) )
{
ret = serve_main_page (connection);
if (ret != MHD_YES)
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to create page for `%s'\n"),
url);
return ret;
}
if (0 == strcmp (method, MHD_HTTP_METHOD_POST))
{
request = *ptr;
if (NULL == request)
{
request = GNUNET_malloc (sizeof (struct Request));
*ptr = request;
request->pp = MHD_create_post_processor (connection, 1024,
&post_iterator, request);
if (NULL == request->pp)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to setup post processor for `%s'\n"),
url);
return MHD_NO; /* internal error */
}
return MHD_YES;
}
if (NULL != request->pp)
{
/* evaluate POST data */
MHD_post_process (request->pp,
upload_data,
*upload_data_size);
if (0 != *upload_data_size)
{
*upload_data_size = 0;
return MHD_YES;
}
/* done with POST data, serve response */
MHD_destroy_post_processor (request->pp);
request->pp = NULL;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_short_hash_from_string2 (request->public_key,
strlen (request->public_key),
&pub))
{
/* parse error */
return fill_s_reply ("Failed to parse given public key",
request, connection);
}
switch (request->phase)
{
case RP_START:
request->phase = RP_LOOKUP;
request->qe = GNUNET_NAMESTORE_lookup_record (ns,
&fcfsd_zone,
request->domain_name,
GNUNET_NAMESTORE_TYPE_PKEY,
&lookup_result_processor,
request);
break;
case RP_LOOKUP:
break;
case RP_PUT:
break;
case RP_FAIL:
return fill_s_reply ("Request failed, sorry.",
request, connection);
case RP_SUCCESS:
return fill_s_reply ("Success.",
request, connection);
default:
GNUNET_break (0);
return MHD_NO;
}
return MHD_YES; /* will have a reply later... */
}
/* unsupported HTTP method */
response = MHD_create_response_from_buffer (strlen (METHOD_ERROR),
(void *) METHOD_ERROR,
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response (connection,
MHD_HTTP_METHOD_NOT_ACCEPTABLE,
response);
MHD_destroy_response (response);
return ret;
}
/**
* Callback called upon completion of a request.
* Decrements session reference counter.
*
* @param cls not used
* @param connection connection that completed
* @param con_cls session handle
* @param toe status code
*/
static void
request_completed_callback (void *cls,
struct MHD_Connection *connection,
void **con_cls,
enum MHD_RequestTerminationCode toe)
{
struct Request *request = *con_cls;
if (NULL == request)
return;
if (NULL != request->pp)
MHD_destroy_post_processor (request->pp);
if (NULL != request->qe)
GNUNET_NAMESTORE_cancel (request->qe);
GNUNET_free (request);
}
/**
* Schedule tasks to run MHD server.
*/
static void
run_httpd ()
{
fd_set rs;
fd_set ws;
fd_set es;
struct GNUNET_NETWORK_FDSet *wrs;
struct GNUNET_NETWORK_FDSet *wws;
struct GNUNET_NETWORK_FDSet *wes;
int max;
int haveto;
unsigned MHD_LONG_LONG timeout;
struct GNUNET_TIME_Relative tv;
FD_ZERO (&rs);
FD_ZERO (&ws);
FD_ZERO (&es);
wrs = GNUNET_NETWORK_fdset_create ();
wes = GNUNET_NETWORK_fdset_create ();
wws = GNUNET_NETWORK_fdset_create ();
max = -1;
GNUNET_assert (MHD_YES == MHD_get_fdset (httpd, &rs, &ws, &es, &max));
haveto = MHD_get_timeout (httpd, &timeout);
if (haveto == MHD_YES)
tv.rel_value = (uint64_t) timeout;
else
tv = GNUNET_TIME_UNIT_FOREVER_REL;
GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
GNUNET_NETWORK_fdset_copy_native (wes, &es, max + 1);
httpd_task =
GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
tv, wrs, wws,
&do_httpd, NULL);
GNUNET_NETWORK_fdset_destroy (wrs);
GNUNET_NETWORK_fdset_destroy (wws);
GNUNET_NETWORK_fdset_destroy (wes);
}
/**
* Task run whenever HTTP server operations are pending.
*
* @param cls unused
* @param tc scheduler context
*/
static void
do_httpd (void *cls,
const struct GNUNET_SCHEDULER_TaskContext *tc)
{
httpd_task = GNUNET_SCHEDULER_NO_TASK;
MHD_run (httpd);
run_httpd ();
}
/**
* Task run on shutdown. Cleans up everything.
*
* @param cls unused
* @param tc scheduler context
*/
static void
do_shutdown (void *cls,
const struct GNUNET_SCHEDULER_TaskContext *tc)
{
if (GNUNET_SCHEDULER_NO_TASK != httpd_task)
{
GNUNET_SCHEDULER_cancel (httpd_task);
httpd_task = GNUNET_SCHEDULER_NO_TASK;
}
if (NULL != ns)
{
GNUNET_NAMESTORE_disconnect (ns, GNUNET_NO);
ns = NULL;
}
if (NULL != httpd)
{
MHD_stop_daemon (httpd);
httpd = NULL;
}
if (NULL != fcfs_zone_pkey)
{
GNUNET_CRYPTO_rsa_key_free (fcfs_zone_pkey);
fcfs_zone_pkey = NULL;
}
}
/**
* 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
*/
static void
run (void *cls, char *const *args, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
char *keyfile;
unsigned long long port;
struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pub;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg,
"fcfsd",
"HTTPPORT",
&port))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Option `%s' not specified in configuration section `%s'\n"),
"HTTPPORT",
"fcfsd");
return;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
"fcfsd",
"ZONEKEY",
&keyfile))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Option `%s' not specified in configuration section `%s'\n"),
"ZONEKEY",
"fcfsd");
return;
}
fcfs_zone_pkey = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
GNUNET_free (keyfile);
if (NULL == fcfs_zone_pkey)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to read or create private zone key\n"));
return;
}
GNUNET_CRYPTO_rsa_key_get_public (fcfs_zone_pkey,
&pub);
GNUNET_CRYPTO_short_hash (&pub, sizeof (pub), &fcfsd_zone);
ns = GNUNET_NAMESTORE_connect (cfg);
if (NULL == ns)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to connect to namestore\n"));
return;
}
httpd = MHD_start_daemon (MHD_USE_DEBUG,
(uint16_t) port,
NULL, NULL,
&create_response, NULL,
MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 128,
MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 1,
MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 16,
MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (4 * 1024),
MHD_OPTION_NOTIFY_COMPLETED, &request_completed_callback, NULL,
MHD_OPTION_END);
if (NULL == httpd)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to start HTTP server\n"));
GNUNET_NAMESTORE_disconnect (ns, GNUNET_NO);
ns = NULL;
return;
}
run_httpd ();
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
&do_shutdown, NULL);
}
/**
* The main function for the fcfs 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)
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_OPTION_END
};
int ret;
if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
return 2;
GNUNET_log_setup ("fcfsd", "WARNING", NULL);
ret =
(GNUNET_OK ==
GNUNET_PROGRAM_run (argc, argv, "fcfsd",
_("GNUnet GNS first come first serve registration service"),
options,
&run, NULL)) ? 0 : 1;
return ret;
}
/* end of gnunet-gns-fcfsd.c */
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