/**
* Construct our HELLO message from all of the addresses of
* all of the transports.
*
* @param cls unused
* @param tc scheduler context
*/
static void
refresh_hello_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct GeneratorContext gc;
int friend_only;
hello_task = GNUNET_SCHEDULER_NO_TASK;
gc.addr_pos = oal_head;
gc.expiration = GNUNET_TIME_relative_to_absolute (hello_expiration);
friend_only = GNUNET_HELLO_is_friend_only (our_hello);
GNUNET_free (our_hello);
our_hello = GNUNET_HELLO_create (&GST_my_public_key, &address_generator, &gc, friend_only);
GNUNET_assert (NULL != our_hello);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Refreshed my %s `%s', new size is %d\n",
(GNUNET_YES == GNUNET_HELLO_is_friend_only (our_hello)) ? "friend-only" : "public",
"HELLO", GNUNET_HELLO_size (our_hello));
GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# refreshed my HELLO"), 1,
GNUNET_NO);
if (NULL != hello_cb)
hello_cb (hello_cb_cls, GST_hello_get ());
GNUNET_PEERINFO_add_peer (GST_peerinfo, our_hello, NULL, NULL);
hello_task =
GNUNET_SCHEDULER_add_delayed (HELLO_REFRESH_PERIOD, &refresh_hello_task,
NULL);
}
/**
* Parse a hello URI string to a hello message.
*
* @param uri URI string to parse
* @param pubkey Pointer to struct where public key is parsed
* @param hello Pointer to struct where hello message is parsed
* @param plugins_find Function to find transport plugins by name
* @return GNUNET_OK on success, GNUNET_SYSERR if the URI was invalid, GNUNET_NO on other errors
*/
int
GNUNET_HELLO_parse_uri (const char *uri,
struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pubkey,
struct GNUNET_HELLO_Message **hello,
GNUNET_HELLO_TransportPluginsFind plugins_find)
{
const char *pks;
const char *exc;
struct GNUNET_HELLO_ParseUriContext ctx;
if (0 != strncmp (uri,
GNUNET_HELLO_URI_PREFIX,
strlen (GNUNET_HELLO_URI_PREFIX)))
return GNUNET_SYSERR;
pks = &uri[strlen (GNUNET_HELLO_URI_PREFIX)];
exc = strstr (pks, "!");
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (pks,
(NULL == exc) ? strlen (pks) : (exc - pks),
(unsigned char *) pubkey,
sizeof (*pubkey)))
return GNUNET_SYSERR;
ctx.pos = exc;
ctx.ret = GNUNET_OK;
ctx.plugins_find = plugins_find;
*hello = GNUNET_HELLO_create (pubkey, &add_address_to_hello, &ctx);
return ctx.ret;
}
/**
* We've received a HELLO, check which addresses are new and trigger
* validation.
*
* @param hello the HELLO we received
*/
void
GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
{
const struct GNUNET_HELLO_Message *hm =
(const struct GNUNET_HELLO_Message *) hello;
struct ValidateAddressContext vac;
struct GNUNET_HELLO_Message *h;
if ((GNUNET_OK != GNUNET_HELLO_get_id (hm, &vac.pid)) ||
(GNUNET_OK != GNUNET_HELLO_get_key (hm, &vac.public_key)))
{
/* malformed HELLO */
GNUNET_break (0);
return;
}
if (0 ==
memcmp (&GST_my_identity, &vac.pid, sizeof (struct GNUNET_PeerIdentity)))
return;
/* Add peer identity without addresses to peerinfo service */
h = GNUNET_HELLO_create (&vac.public_key, NULL, NULL);
GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
#if VERBOSE_VALIDATION
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
_("Adding `%s' without addresses for peer `%s'\n"), "HELLO",
GNUNET_i2s (&vac.pid));
#endif
GNUNET_free (h);
GNUNET_assert (NULL ==
GNUNET_HELLO_iterate_addresses (hm, GNUNET_NO,
&validate_address_iterator,
&vac));
}
/**
* Construct a HELLO message by merging the
* addresses in two existing HELLOs (which
* must be for the same peer).
*
* @param h1 first HELLO message
* @param h2 the second HELLO message
* @return the combined hello message
*/
struct GNUNET_HELLO_Message *
GNUNET_HELLO_merge (const struct GNUNET_HELLO_Message *h1,
const struct GNUNET_HELLO_Message *h2)
{
struct MergeContext mc = { h1, h2, NULL, NULL, 0, 0, 0 };
return GNUNET_HELLO_create (&h1->publicKey, &merge_addr, &mc);
}
/**
* Initialize the HELLO module.
*
* @param friend_only use a friend only hello
* @param cb function to call whenever our HELLO changes
* @param cb_cls closure for cb
*/
void
GST_hello_start (int friend_only, GST_HelloCallback cb, void *cb_cls)
{
hello_cb = cb;
hello_cb_cls = cb_cls;
our_hello = GNUNET_HELLO_create (&GST_my_public_key, NULL, NULL, friend_only);
GNUNET_assert (NULL != our_hello);
refresh_hello ();
}
static void
add_peer ()
{
struct GNUNET_HELLO_Message *h2;
size_t agc;
agc = 2;
memset (&pid, 32, sizeof (pid));
h2 = GNUNET_HELLO_create (&pid.public_key, &address_generator, &agc, GNUNET_NO);
GNUNET_PEERINFO_add_peer (h, h2, NULL, NULL);
GNUNET_free (h2);
}
/**
* Parse the PUT URI given at the command line and add it to our peerinfo
* database.
*
* @param put_uri URI string to parse
* @return GNUNET_OK on success, GNUNET_SYSERR if the URI was invalid, GNUNET_NO on other errors
*/
static int
parse_hello_uri (const char *put_uri)
{
const char *pks;
const char *exc;
struct GNUNET_HELLO_Message *hello;
struct GNUNET_PEERINFO_HelloAddressParsingContext ctx;
if (0 != strncmp (put_uri,
HELLO_URI_PREFIX,
strlen (HELLO_URI_PREFIX)))
return GNUNET_SYSERR;
pks = &put_uri[strlen (HELLO_URI_PREFIX)];
exc = strstr (pks, "!");
if (GNUNET_OK != GNUNET_STRINGS_string_to_data (pks,
(NULL == exc) ? strlen (pks) : (exc - pks),
(unsigned char *) &my_public_key,
sizeof (my_public_key)))
return GNUNET_SYSERR;
ctx.pos = exc;
ctx.ret = GNUNET_OK;
hello = GNUNET_HELLO_create (&my_public_key, &add_address_to_hello, &ctx);
if (NULL != hello)
{
/* WARNING: this adds the address from URI WITHOUT verification! */
if (GNUNET_OK == ctx.ret)
ac = GNUNET_PEERINFO_add_peer (peerinfo, hello, &add_continuation, NULL);
else
tt = GNUNET_SCHEDULER_add_now (&state_machine, NULL);
GNUNET_free (hello);
}
/* wait 1s to give peerinfo operation a chance to succeed */
/* FIXME: current peerinfo API sucks to require this; not to mention
that we get no feedback to determine if the operation actually succeeded */
return ctx.ret;
}
int
main (int argc, char *argv[])
{
struct GNUNET_DISK_FileHandle *fh;
struct GNUNET_HELLO_Message *orig;
struct GNUNET_HELLO_Message *result;
struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
uint64_t fsize;
GNUNET_log_setup ("gnunet-hello", "INFO", NULL);
if (argc != 2)
{
FPRINTF (stderr,
"%s",
_("Call with name of HELLO file to modify.\n"));
return 1;
}
if (GNUNET_OK != GNUNET_DISK_file_size (argv[1], &fsize, GNUNET_YES, GNUNET_YES))
{
FPRINTF (stderr,
_("Error accessing file `%s': %s\n"),
argv[1],
STRERROR (errno));
return 1;
}
if (fsize > 65536)
{
FPRINTF (stderr,
_("File `%s' is too big to be a HELLO\n"),
argv[1]);
return 1;
}
if (fsize < sizeof (struct GNUNET_MessageHeader))
{
FPRINTF (stderr,
_("File `%s' is too small to be a HELLO\n"),
argv[1]);
return 1;
}
fh = GNUNET_DISK_file_open (argv[1],
GNUNET_DISK_OPEN_READ,
GNUNET_DISK_PERM_USER_READ);
if (NULL == fh)
{
FPRINTF (stderr,
_("Error opening file `%s': %s\n"),
argv[1],
STRERROR (errno));
return 1;
}
{
char buf[fsize] GNUNET_ALIGN;
GNUNET_assert (fsize ==
GNUNET_DISK_file_read (fh, buf, fsize));
GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
orig = (struct GNUNET_HELLO_Message *) buf;
if ( (fsize != GNUNET_HELLO_size (orig)) ||
(GNUNET_OK != GNUNET_HELLO_get_key (orig, &pk)) )
{
FPRINTF (stderr,
_("Did not find well-formed HELLO in file `%s'\n"),
argv[1]);
return 1;
}
result = GNUNET_HELLO_create (&pk, &add_from_hello, &orig);
GNUNET_assert (NULL != result);
fh = GNUNET_DISK_file_open (argv[1],
GNUNET_DISK_OPEN_WRITE,
GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
if (NULL == fh)
{
FPRINTF (stderr,
_("Error opening file `%s': %s\n"),
argv[1],
STRERROR (errno));
GNUNET_free (result);
return 1;
}
fsize = GNUNET_HELLO_size (result);
if (fsize != GNUNET_DISK_file_write (fh,
result,
fsize))
{
FPRINTF (stderr,
_("Error writing HELLO to file `%s': %s\n"),
argv[1],
STRERROR (errno));
(void) GNUNET_DISK_file_close (fh);
return 1;
}
GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
}
return 0;
}
/**
* We've received a PONG. Check if it matches a pending PING and
* mark the respective address as confirmed.
*
* @param sender peer sending the PONG
* @param hdr the PONG
*/
void
GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
const struct GNUNET_MessageHeader *hdr)
{
const struct TransportPongMessage *pong;
struct ValidationEntry *ve;
const char *tname;
const char *addr;
size_t addrlen;
size_t slen;
size_t size;
struct GNUNET_HELLO_Message *hello;
struct GNUNET_HELLO_Address address;
if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
{
GNUNET_break_op (0);
return;
}
GNUNET_STATISTICS_update (GST_stats,
gettext_noop ("# PONG messages received"), 1,
GNUNET_NO);
pong = (const struct TransportPongMessage *) hdr;
tname = (const char *) &pong[1];
size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
addr = memchr (tname, '\0', size);
if (NULL == addr)
{
GNUNET_break_op (0);
return;
}
addr++;
slen = strlen (tname) + 1;
addrlen = size - slen;
address.peer = *sender;
address.address = addr;
address.address_length = addrlen;
address.transport_name = tname;
ve = find_validation_entry (NULL, &address);
if ((NULL == ve) || (ve->expecting_pong == GNUNET_NO))
{
GNUNET_STATISTICS_update (GST_stats,
gettext_noop
("# PONGs dropped, no matching pending validation"),
1, GNUNET_NO);
return;
}
/* now check that PONG is well-formed */
if (0 != memcmp (&ve->pid, sender, sizeof (struct GNUNET_PeerIdentity)))
{
GNUNET_break_op (0);
return;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
&pong->purpose, &pong->signature,
&ve->public_key))
{
GNUNET_break_op (0);
return;
}
if (GNUNET_TIME_absolute_get_remaining
(GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
{
GNUNET_STATISTICS_update (GST_stats,
gettext_noop
("# PONGs dropped, signature expired"), 1,
GNUNET_NO);
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Address validated for peer `%s' with plugin `%s': `%s'\n",
GNUNET_i2s (sender), tname, GST_plugins_a2s (ve->address));
/* validity achieved, remember it! */
ve->expecting_pong = GNUNET_NO;
ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
{
struct GNUNET_ATS_Information ats;
ats.type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
ats.value = htonl ((uint32_t) ve->latency.rel_value);
GNUNET_ATS_address_update (GST_ats, ve->address, NULL, &ats, 1);
}
/* build HELLO to store in PEERINFO */
ve->copied = GNUNET_NO;
hello = GNUNET_HELLO_create (&ve->public_key, &add_valid_peer_address, ve);
GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
GNUNET_free (hello);
}