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23 * @brief helper library for handling HELLOs
24 * @author Christian Grothoff
25 * @author Matthias Wachs
28 #include "gnunet_hello_lib.h"
29 #include "gnunet_protocols.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_transport_plugin.h"
34 * Context used for building our own URI.
36 struct GNUNET_HELLO_ComposeUriContext
44 * Function for finding transport plugins by name.
46 GNUNET_HELLO_TransportPluginsFind plugins_find;
51 * Context for #add_address_to_hello().
53 struct GNUNET_HELLO_ParseUriContext
56 * Position in the URI with the next address to parse.
61 * Set to #GNUNET_SYSERR to indicate parse errors.
68 unsigned int counter_total;
71 * Counter skipped addresses
73 unsigned int counter_added;
76 * Function for finding transport plugins by name.
78 GNUNET_HELLO_TransportPluginsFind plugins_find;
85 * @param h HELLO Message to test
86 * @return #GNUNET_YES for friend-only or #GNUNET_NO otherwise
89 GNUNET_HELLO_is_friend_only (const struct GNUNET_HELLO_Message *h)
91 if (GNUNET_YES == ntohl(h->friend_only))
98 * Copy the given address information into
99 * the given buffer using the format of HELLOs.
101 * @param address the address
102 * @param expiration expiration for the @a address
103 * @param target where to copy the @a address
104 * @param max maximum number of bytes to copy to target
105 * @return number of bytes copied, 0 if
106 * the target buffer was not big enough.
109 GNUNET_HELLO_add_address (const struct GNUNET_HELLO_Address *address,
110 struct GNUNET_TIME_Absolute expiration,
116 struct GNUNET_TIME_AbsoluteNBO exp;
118 slen = strlen (address->transport_name) + 1;
119 if (slen + sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
120 address->address_length > max)
122 exp = GNUNET_TIME_absolute_hton (expiration);
123 alen = htons ((uint16_t) address->address_length);
124 GNUNET_memcpy (target, address->transport_name, slen);
125 GNUNET_memcpy (&target[slen], &alen, sizeof (uint16_t));
126 slen += sizeof (uint16_t);
127 GNUNET_memcpy (&target[slen], &exp, sizeof (struct GNUNET_TIME_AbsoluteNBO));
128 slen += sizeof (struct GNUNET_TIME_AbsoluteNBO);
129 GNUNET_memcpy (&target[slen], address->address, address->address_length);
130 slen += address->address_length;
136 * Get the size of an address entry in a HELLO message.
138 * @param buf pointer to the start of the address entry
139 * @param max maximum size of the entry (end of @a buf)
140 * @param ralen set to the address length
141 * @return size of the entry, or 0 if @a max is not large enough
144 get_hello_address_size (const char *buf,
156 while ((left > 0) && ('\0' != *pos))
164 /* 0-termination not found */
169 if (left < sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO))
171 /* not enough space for addrlen */
175 GNUNET_memcpy (&alen, pos, sizeof (uint16_t));
178 slen += alen + sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO);
181 /* not enough space for addr */
190 * Construct a HELLO message given the public key,
191 * expiration time and an iterator that spews the
192 * transport addresses.
194 * If friend only is set to #GNUNET_YES we create a FRIEND_HELLO which
195 * will not be gossiped to other peers.
197 * @param public_key public key to include in the HELLO
198 * @param addrgen callback to invoke to get addresses
199 * @param addrgen_cls closure for @a addrgen
200 * @param friend_only should the returned HELLO be only visible to friends?
201 * @return the hello message
203 struct GNUNET_HELLO_Message *
204 GNUNET_HELLO_create (const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
205 GNUNET_HELLO_GenerateAddressListCallback addrgen,
209 char buffer[GNUNET_MAX_MESSAGE_SIZE - 1 - 256 -
210 sizeof (struct GNUNET_HELLO_Message)];
214 struct GNUNET_HELLO_Message *hello;
216 GNUNET_assert (NULL != public_key);
217 GNUNET_assert ( (GNUNET_YES == friend_only) ||
218 (GNUNET_NO == friend_only) );
219 max = sizeof (buffer);
223 while (GNUNET_SYSERR != (ret = addrgen (addrgen_cls,
231 hello = GNUNET_malloc (sizeof (struct GNUNET_HELLO_Message) + used);
232 hello->header.type = htons (GNUNET_MESSAGE_TYPE_HELLO);
233 hello->header.size = htons (sizeof (struct GNUNET_HELLO_Message) + used);
234 hello->friend_only = htonl (friend_only);
235 hello->publicKey = *public_key;
236 GNUNET_memcpy (&hello[1],
244 * Iterate over all of the addresses in the HELLO.
246 * @param msg HELLO to iterate over
247 * @param return_modified if a modified copy should be returned,
248 * otherwise NULL will be returned
249 * @param it iterator to call on each address
250 * @param it_cls closure for @a it
251 * @return modified HELLO message
253 struct GNUNET_HELLO_Message *
254 GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg,
256 GNUNET_HELLO_AddressIterator it,
259 struct GNUNET_HELLO_Address address;
261 struct GNUNET_HELLO_Message *ret;
268 struct GNUNET_TIME_AbsoluteNBO expire;
271 msize = GNUNET_HELLO_size (msg);
272 if ((msize < sizeof (struct GNUNET_HELLO_Message)) ||
273 (ntohs (msg->header.type) != GNUNET_MESSAGE_TYPE_HELLO))
281 ret = GNUNET_malloc (msize);
286 inptr = (const char *) &msg[1];
287 insize = msize - sizeof (struct GNUNET_HELLO_Message);
289 woff = (NULL != ret) ? (char *) &ret[1] : NULL;
290 address.peer.public_key = msg->publicKey;
291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
292 "HELLO has %u bytes of address data\n",
293 (unsigned int) insize);
297 esize = get_hello_address_size (inptr,
303 GNUNET_free_non_null (ret);
306 /* need GNUNET_memcpy() due to possibility of misalignment */
307 GNUNET_memcpy (&expire,
308 &inptr[esize - alen - sizeof (struct GNUNET_TIME_AbsoluteNBO)],
309 sizeof (struct GNUNET_TIME_AbsoluteNBO));
310 address.address = &inptr[esize - alen];
311 address.address_length = alen;
312 address.transport_name = inptr;
313 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
316 GNUNET_TIME_absolute_ntoh (expire));
317 if (GNUNET_SYSERR == iret)
319 if ( (GNUNET_OK == iret) &&
322 /* copy address over */
333 ret->header.size = ntohs (sizeof (struct GNUNET_HELLO_Message) + wpos);
339 * Closure for #get_match_exp().
344 * Address we are looking for.
346 const struct GNUNET_HELLO_Address *address;
349 * Set to #GNUNET_YES if we found the @e address.
354 * Set to the expiration of the match if @e found is #GNUNET_YES.
356 struct GNUNET_TIME_Absolute expiration;
361 * Store the expiration time of an address that matches the template.
363 * @param cls the `struct ExpireContext`
364 * @param address address to match against the template
365 * @param expiration expiration time of @a address, to store in @a cls
366 * @return #GNUNET_SYSERR if we found a matching address, #GNUNET_OK otherwise
369 get_match_exp (void *cls,
370 const struct GNUNET_HELLO_Address *address,
371 struct GNUNET_TIME_Absolute expiration)
373 struct ExpireContext *ec = cls;
375 if (0 != GNUNET_HELLO_address_cmp (address,
378 ec->found = GNUNET_YES;
379 ec->expiration = expiration;
380 return GNUNET_SYSERR; /* done here */
385 * Context for a #GNUNET_HELLO_Merge operation.
390 * First HELLO we are merging.
392 const struct GNUNET_HELLO_Message *h1;
395 * Second HELLO we are merging.
397 const struct GNUNET_HELLO_Message *h2;
400 * Either @e h1 or @e h2, used when copying
401 * to compare against (so we only copy the
402 * most recent entry).
404 const struct GNUNET_HELLO_Message *other;
407 * Buffer where we copy to.
412 * Number of bytes allocated in @e buf
417 * Current (write) offset in @e buf.
422 * Should we copy addresses with an identical value
423 * and expiration time in @e other, or do we only
424 * copy addresses with strictly later expiration times?
432 * Append the address @a address to the buffer from
433 * the merge context IF it is more recent than equivalent
434 * addresses in `other`.
436 * @param cls the `struct MergeContext`
437 * @param address the HELLO address we might copy
438 * @param expiration expiration time for @a address
439 * @return always #GNUNET_OK
442 copy_latest (void *cls,
443 const struct GNUNET_HELLO_Address *address,
444 struct GNUNET_TIME_Absolute expiration)
446 struct MergeContext *mc = cls;
447 struct ExpireContext ec;
449 ec.address = address;
450 ec.found = GNUNET_NO;
451 /* check if address exists in other */
452 GNUNET_HELLO_iterate_addresses (mc->other,
456 if ( (GNUNET_NO == ec.found) ||
457 (ec.expiration.abs_value_us < expiration.abs_value_us) ||
458 ( (ec.expiration.abs_value_us == expiration.abs_value_us) &&
459 (GNUNET_YES == mc->take_equal) ) )
461 /* copy address to buffer */
463 GNUNET_HELLO_add_address (address,
473 * Function called to build the HELLO during
474 * #GNUNET_HELLO_merge() by merging addresses from
475 * two original HELLOs.
477 * @param cls the `struct MergeContext`
478 * @param max number of bytes we can write at most in @a buf
479 * @param buf where to copy the addresses
480 * @return #GNUNET_SYSERR to end iteration, otherwise number of bytes written to @a buf
483 merge_addr (void *cls,
487 struct MergeContext *mc = cls;
490 return GNUNET_SYSERR; /* Stop iteration */
494 mc->take_equal = GNUNET_NO;
496 /* copy addresses from h1, if strictly larger expiration than h2 */
497 GNUNET_HELLO_iterate_addresses (mc->h1,
501 mc->take_equal = GNUNET_YES;
503 /* copy addresses from h2, if larger or equal expiration than h1 */
504 GNUNET_HELLO_iterate_addresses (mc->h2,
508 /* set marker to stop iteration */
515 * Construct a HELLO message by merging the
516 * addresses in two existing HELLOs (which
517 * must be for the same peer).
519 * @param h1 first HELLO message
520 * @param h2 the second HELLO message
521 * @return the combined HELLO message
523 struct GNUNET_HELLO_Message *
524 GNUNET_HELLO_merge (const struct GNUNET_HELLO_Message *h1,
525 const struct GNUNET_HELLO_Message *h2)
527 struct MergeContext mc = { h1, h2, NULL, NULL, 0, 0, 0 };
530 if (h1->friend_only != h2->friend_only)
531 friend_only = GNUNET_YES; /* One of the HELLOs is friend only */
533 friend_only = ntohl (h1->friend_only); /* Both HELLO's have the same type */
535 return GNUNET_HELLO_create (&h1->publicKey,
543 * Context used in #GNUNET_HELLO_iterate_new_addresses() to
544 * figure out which addresses are in fact 'new'.
549 * We should ignore addresses that expire before this time.
551 struct GNUNET_TIME_Absolute expiration_limit;
554 * Function to call on addresses that are indeed new.
556 GNUNET_HELLO_AddressIterator it;
564 * HELLO with known addresses, addresses in this HELLO
565 * we must always ignore.
567 const struct GNUNET_HELLO_Message *old_hello;
572 * Check if the given address is 'new', and if so, call
573 * the iterator. Compares the existing address against
574 * addresses in the context's `old_hello` and calls the
575 * iterator on those that are new (and not expired).
577 * @param cls the `struct DeltaContext`
578 * @param address an address to check whether it is new
579 * @param expiration expiration time for @a address
580 * @return #GNUNET_YES if the address is ignored, otherwise
581 * whatever the iterator returned.
584 delta_match (void *cls,
585 const struct GNUNET_HELLO_Address *address,
586 struct GNUNET_TIME_Absolute expiration)
588 struct DeltaContext *dc = cls;
590 struct ExpireContext ec;
592 ec.address = address;
593 ec.found = GNUNET_NO;
594 GNUNET_HELLO_iterate_addresses (dc->old_hello,
598 if ( (GNUNET_YES == ec.found) &&
599 ( (ec.expiration.abs_value_us > expiration.abs_value_us) ||
600 (ec.expiration.abs_value_us >= dc->expiration_limit.abs_value_us)))
601 return GNUNET_YES; /* skip: found and boring */
602 ret = dc->it (dc->it_cls,
610 * Iterate over addresses in @a new_hello that are NOT already present
611 * in @a old_hello. Note that if the address is present in @a old_hello
612 * but the expiration time in @a new_hello is more recent, the iterator
615 * @param new_hello a HELLO message
616 * @param old_hello a HELLO message
617 * @param expiration_limit ignore addresses in @a old_hello
618 * that expired before the given time stamp
619 * @param it iterator to call on each address
620 * @param it_cls closure for @a it
623 GNUNET_HELLO_iterate_new_addresses (const struct GNUNET_HELLO_Message *new_hello,
624 const struct GNUNET_HELLO_Message *old_hello,
625 struct GNUNET_TIME_Absolute expiration_limit,
626 GNUNET_HELLO_AddressIterator it,
629 struct DeltaContext dc;
631 dc.expiration_limit = expiration_limit;
634 dc.old_hello = old_hello;
635 GNUNET_assert (NULL ==
636 GNUNET_HELLO_iterate_addresses (new_hello,
644 * Return the size of the given HELLO message.
645 * @param hello to inspect
646 * @return the size, 0 if HELLO is invalid
649 GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello)
651 uint16_t ret = ntohs (hello->header.size);
653 if ((ret < sizeof (struct GNUNET_HELLO_Message)) ||
654 (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO))
661 * Get the peer identity from a HELLO message.
663 * @param hello the hello message
664 * @param peer where to store the peer's identity
665 * @return #GNUNET_SYSERR if the HELLO was malformed
668 GNUNET_HELLO_get_id (const struct GNUNET_HELLO_Message *hello,
669 struct GNUNET_PeerIdentity *peer)
671 uint16_t ret = ntohs (hello->header.size);
673 if ((ret < sizeof (struct GNUNET_HELLO_Message)) ||
674 (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO))
675 return GNUNET_SYSERR;
676 peer->public_key = hello->publicKey;
682 * Get the header from a HELLO message, used so other code
683 * can correctly send HELLO messages.
685 * @param hello the hello message
687 * @return header or NULL if the HELLO was malformed
689 struct GNUNET_MessageHeader *
690 GNUNET_HELLO_get_header (struct GNUNET_HELLO_Message *hello)
692 uint16_t ret = ntohs (hello->header.size);
694 if ((ret < sizeof (struct GNUNET_HELLO_Message)) ||
695 (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO))
698 return &hello->header;
703 * Context used for comparing HELLOs in #GNUNET_HELLO_equals().
708 * Addresses that expired before this date are ignored for
711 struct GNUNET_TIME_Absolute expiration_limit;
714 * Earliest expiration time for which we found a match
715 * with a difference in expiration times.
716 * At this time, the two HELLOs may start to diverge.
718 struct GNUNET_TIME_Absolute result;
721 * HELLO message to compare against. (First set to the second
722 * HELLO, then set to the first HELLO.)
724 const struct GNUNET_HELLO_Message *ref;
727 * Address we are currently looking for.
729 const struct GNUNET_HELLO_Address *address;
732 * Expiration time of @e address.
734 struct GNUNET_TIME_Absolute expiration;
737 * Did we find the address we were looking for?
745 * Check if the given address matches the address we are currently
746 * looking for. If so, sets `found` to #GNUNET_YES and, if the
747 * expiration times for the two addresses differ, updates `result` to
748 * the minimum of our @a expiration and the existing value
750 * @param cls the `struct EqualsContext`
751 * @param address address from the reference HELLO
752 * @param expiration expiration time for @a address
753 * @return #GNUNET_YES if the address is expired or does not match
754 * #GNUNET_SYSERR if the address does match.
757 find_other_matching (void *cls,
758 const struct GNUNET_HELLO_Address *address,
759 struct GNUNET_TIME_Absolute expiration)
761 struct EqualsContext *ec = cls;
763 if (expiration.abs_value_us < ec->expiration_limit.abs_value_us)
765 if (0 == GNUNET_HELLO_address_cmp (address, ec->address))
767 ec->found = GNUNET_YES;
768 if (expiration.abs_value_us < ec->expiration.abs_value_us)
769 ec->result = GNUNET_TIME_absolute_min (expiration,
771 return GNUNET_SYSERR;
778 * Helper function for #GNUNET_HELLO_equals(). Checks
779 * if the given @a address exists also in the other HELLO;
780 * if not, the result time is set to zero and the iteration
783 * @param cls the `struct EqualsContext`
784 * @param address address to locate
785 * @param expiration expiration time of the current address
786 * @return #GNUNET_OK if the address exists or is expired,
787 * #GNUNET_SYSERR if it was not found
790 find_matching (void *cls,
791 const struct GNUNET_HELLO_Address *address,
792 struct GNUNET_TIME_Absolute expiration)
794 struct EqualsContext *ec = cls;
796 if (expiration.abs_value_us < ec->expiration_limit.abs_value_us)
797 return GNUNET_OK; /* expired, we don't care */
798 ec->address = address;
799 ec->expiration = expiration;
800 ec->found = GNUNET_NO;
801 GNUNET_HELLO_iterate_addresses (ec->ref,
803 &find_other_matching,
805 if (GNUNET_NO == ec->found)
807 /* not found, we differ *now* */
808 ec->result = GNUNET_TIME_UNIT_ZERO_ABS;
809 return GNUNET_SYSERR;
816 * Test if two HELLO messages contain the same addresses.
817 * If they only differ in expiration time, the lowest
818 * expiration time larger than @a now where they differ
821 * @param h1 first HELLO message
822 * @param h2 the second HELLO message
823 * @param now time to use for deciding which addresses have
824 * expired and should not be considered at all
825 * @return absolute time forever if the two HELLOs are
826 * totally identical; smallest timestamp >= @a now if
827 * they only differ in timestamps;
828 * zero if the some addresses with expirations >= @a now
829 * do not match at all
831 struct GNUNET_TIME_Absolute
832 GNUNET_HELLO_equals (const struct GNUNET_HELLO_Message *h1,
833 const struct GNUNET_HELLO_Message *h2,
834 struct GNUNET_TIME_Absolute now)
836 struct EqualsContext ec;
838 if (h1->header.type != h2->header.type)
839 return GNUNET_TIME_UNIT_ZERO_ABS;
841 memcmp (&h1->publicKey,
843 sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)))
844 return GNUNET_TIME_UNIT_ZERO_ABS;
845 ec.expiration_limit = now;
846 ec.result = GNUNET_TIME_UNIT_FOREVER_ABS;
848 GNUNET_HELLO_iterate_addresses (h1,
852 if (ec.result.abs_value_us == GNUNET_TIME_UNIT_ZERO.rel_value_us)
855 GNUNET_HELLO_iterate_addresses (h2,
864 * Iterator to find the time when the last address will expire.
865 * Updates the maximum value stored in @a cls.
867 * @param cls where to store the max, a `struct GNUNET_TIME_Absolute`
868 * @param address an address (ignored)
869 * @param expiration expiration time for @a address
870 * @return #GNUNET_OK (always)
873 find_max_expire (void *cls,
874 const struct GNUNET_HELLO_Address *address,
875 struct GNUNET_TIME_Absolute expiration)
877 struct GNUNET_TIME_Absolute *max = cls;
879 *max = GNUNET_TIME_absolute_max (*max, expiration);
885 * When does the last address in the given HELLO expire?
887 * @param msg HELLO to inspect
888 * @return time the last address expires, 0 if there are no addresses in the HELLO
890 struct GNUNET_TIME_Absolute
891 GNUNET_HELLO_get_last_expiration (const struct GNUNET_HELLO_Message *msg)
893 struct GNUNET_TIME_Absolute ret;
895 ret = GNUNET_TIME_UNIT_ZERO_ABS;
896 GNUNET_HELLO_iterate_addresses (msg,
905 * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER".
906 * The specific structure of "IDENTIFIER" depends on the module and
907 * maybe differenciated into additional subcategories if applicable.
908 * This module only deals with hello identifiers (MODULE = "hello").
911 * The concrete URI format is:
913 * "gnunet://hello/PEER[+YYYYMMDDHHMMSS+<TYPE>+<ADDRESS>]...".
914 * These URIs can be used to add a peer record to peerinfo service.
915 * PEER is the string representation of peer's public key.
916 * YYYYMMDDHHMMSS is the expiration date.
917 * TYPE is a transport type.
918 * ADDRESS is the address, its format depends upon the transport type.
919 * The concrete transport types and corresponding address formats are:
923 * <TCP|UDP>!IPADDRESS
924 * IPVDDRESS is either IPV4 .-delimited address in form of XXX.XXX.XXX.XXX:PPPPP
925 * or IPV6 :-delimited address with '[' and ']' (according to RFC2732):
926 * [XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX]:PPPPP
927 * PPPPP is the port number. May be 0.
931 * [add SMTP, HTTP and other addresses here]
935 * The encoding for hexadecimal values is defined in the crypto_hash.c
936 * module in the gnunetutil library and discussed there.
940 * gnunet://hello/V8XXK9GAN5ZJFRFQP8MQX3D83BZTSBQVHKWWD0JPE63Z821906EG+20120302010059+TCP+192.168.0.1:2086+TCP+64.23.8.174:0
941 * gnunet://hello/V8XXK9GAN5ZJFRFQP8MQX3D83BZTSBQVHKWWD0JPE63Z821906EG+20120302010059+TCP+[2001:db8:85a3:8d3:1319:8a2e:370:7348]:2086
949 * Function that is called on each address of this peer.
950 * Expands the corresponding URI string.
952 * @param cls the `struct GNUNET_HELLO_ComposeUriContext`
953 * @param address address to add
954 * @param expiration expiration time for the address
955 * @return #GNUNET_OK (continue iteration).
958 add_address_to_uri (void *cls,
959 const struct GNUNET_HELLO_Address *address,
960 struct GNUNET_TIME_Absolute expiration)
962 struct GNUNET_HELLO_ComposeUriContext *ctx = cls;
963 struct GNUNET_TRANSPORT_PluginFunctions *papi;
969 char *client_str = "_client";
973 papi = ctx->plugins_find (address->transport_name);
976 /* Not an error - we might just not have the right plugin. */
979 if (NULL == papi->address_to_string)
981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
982 "URI conversion not implemented for plugin `%s'\n",
983 address->transport_name);
986 addr = papi->address_to_string (papi->cls,
988 address->address_length);
989 if ( (NULL == addr) ||
990 (0 == strlen(addr)) )
993 addr_dup = GNUNET_strdup (addr);
994 if (NULL != (pos = strstr (addr_dup, "_server")))
997 strlen (client_str)); /* Replace all server addresses with client addresses */
999 seconds = expiration.abs_value_us / 1000LL / 1000LL;
1000 t = gmtime (&seconds);
1002 GNUNET_asprintf (&ret,
1005 GNUNET_HELLO_URI_SEP,
1010 GNUNET_HELLO_URI_SEP,
1011 address->transport_name,
1012 GNUNET_HELLO_URI_SEP,
1014 GNUNET_free (addr_dup);
1015 GNUNET_free (ctx->uri);
1022 * Compose a hello URI string from a hello message.
1024 * @param hello Hello message
1025 * @param plugins_find Function to find transport plugins by name
1026 * @return Hello URI string
1029 GNUNET_HELLO_compose_uri (const struct GNUNET_HELLO_Message *hello,
1030 GNUNET_HELLO_TransportPluginsFind plugins_find)
1032 struct GNUNET_HELLO_ComposeUriContext ctx;
1035 ctx.plugins_find = plugins_find;
1036 pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&hello->publicKey);
1037 GNUNET_asprintf (&ctx.uri,
1039 (GNUNET_YES == GNUNET_HELLO_is_friend_only (hello))
1040 ? GNUNET_FRIEND_HELLO_URI_PREFIX
1041 : GNUNET_HELLO_URI_PREFIX,
1044 GNUNET_HELLO_iterate_addresses (hello,
1046 &add_address_to_uri,
1052 /* ************************* Parse HELLO URI ********************* */
1056 * We're building a HELLO. Parse the next address from the
1057 * parsing context and append it.
1059 * @param cls the `struct GNUNET_HELLO_ParseUriContext`
1060 * @param max number of bytes available for HELLO construction
1061 * @param buffer where to copy the next address (in binary format)
1062 * @return number of bytes added to buffer, #GNUNET_SYSERR on error
1065 add_address_to_hello (void *cls,
1069 struct GNUNET_HELLO_ParseUriContext *ctx = cls;
1071 const char *address;
1075 struct tm expiration_time;
1076 time_t expiration_seconds;
1077 struct GNUNET_TIME_Absolute expire;
1078 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1081 struct GNUNET_HELLO_Address haddr;
1084 if (NULL == ctx->pos)
1085 return GNUNET_SYSERR;
1086 if (GNUNET_HELLO_URI_SEP != ctx->pos[0])
1088 ctx->ret = GNUNET_SYSERR;
1090 return GNUNET_SYSERR;
1094 if ( ('0' == ctx->pos[0]) &&
1095 (GNUNET_HELLO_URI_SEP == ctx->pos[1]) )
1097 expire = GNUNET_TIME_UNIT_FOREVER_ABS;
1098 tname = ctx->pos + 1;
1102 memset (&expiration_time, 0, sizeof (expiration_time));
1103 tname = strptime (ctx->pos,
1108 ctx->ret = GNUNET_SYSERR;
1109 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1110 _("Failed to parse HELLO message: missing expiration time\n"));
1112 return GNUNET_SYSERR;
1115 expiration_seconds = mktime (&expiration_time);
1116 if (expiration_seconds == (time_t) -1)
1118 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1119 _("Failed to parse HELLO message: invalid expiration time\n"));
1120 ctx->ret = GNUNET_SYSERR;
1122 return GNUNET_SYSERR;
1124 expire.abs_value_us = expiration_seconds * 1000LL * 1000LL;
1126 if (GNUNET_HELLO_URI_SEP != tname[0])
1128 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1129 _("Failed to parse HELLO message: malformed\n"));
1130 ctx->ret = GNUNET_SYSERR;
1132 return GNUNET_SYSERR;
1135 address = strchr (tname,
1136 (int) GNUNET_HELLO_URI_SEP);
1137 if (NULL == address)
1139 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1140 _("Failed to parse HELLO message: missing transport plugin\n"));
1141 ctx->ret = GNUNET_SYSERR;
1143 return GNUNET_SYSERR;
1146 end = strchr (address, (int) GNUNET_HELLO_URI_SEP);
1148 ctx->counter_total ++;
1149 plugin_name = GNUNET_strndup (tname, address - (tname+1));
1150 papi = ctx->plugins_find (plugin_name);
1153 /* Not an error - we might just not have the right plugin.
1154 * Skip this part, advance to the next one and recurse.
1155 * But only if this is not the end of string.
1157 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1158 _("Plugin `%s' not found, skipping address\n"),
1160 GNUNET_free (plugin_name);
1163 if (NULL == papi->string_to_address)
1165 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1166 _("Plugin `%s' does not support URIs yet\n"),
1168 GNUNET_free (plugin_name);
1172 uri_address = GNUNET_strndup (address, end - address);
1174 papi->string_to_address (papi->cls,
1176 strlen (uri_address) + 1,
1180 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1181 _("Failed to parse `%s' as an address for plugin `%s'\n"),
1184 GNUNET_free (plugin_name);
1185 GNUNET_free (uri_address);
1188 GNUNET_free (uri_address);
1189 /* address.peer is unset - not used by add_address() */
1190 haddr.address_length = addr_len;
1191 haddr.address = addr;
1192 haddr.transport_name = plugin_name;
1193 ret = GNUNET_HELLO_add_address (&haddr,
1197 ctx->counter_added ++;
1199 GNUNET_free (plugin_name);
1205 * Parse a hello URI string to a hello message.
1207 * @param uri URI string to parse
1208 * @param pubkey Pointer to struct where public key is parsed
1209 * @param hello Pointer to struct where hello message is parsed
1210 * @param plugins_find Function to find transport plugins by name
1211 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the URI was invalid, #GNUNET_NO on other errors
1214 GNUNET_HELLO_parse_uri (const char *uri,
1215 struct GNUNET_CRYPTO_EddsaPublicKey *pubkey,
1216 struct GNUNET_HELLO_Message **hello,
1217 GNUNET_HELLO_TransportPluginsFind plugins_find)
1222 struct GNUNET_HELLO_ParseUriContext ctx;
1224 if (0 == strncmp (uri,
1225 GNUNET_HELLO_URI_PREFIX,
1226 strlen (GNUNET_HELLO_URI_PREFIX)))
1228 pks = &uri[strlen (GNUNET_HELLO_URI_PREFIX)];
1229 friend_only = GNUNET_NO;
1231 else if (0 == strncmp (uri,
1232 GNUNET_FRIEND_HELLO_URI_PREFIX,
1233 strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)))
1235 pks = &uri[strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)];
1236 friend_only = GNUNET_YES;
1239 return GNUNET_SYSERR;
1240 exc = strchr (pks, GNUNET_HELLO_URI_SEP);
1243 GNUNET_STRINGS_string_to_data (pks,
1244 (NULL == exc) ? strlen (pks) : (exc - pks),
1245 (unsigned char *) pubkey,
1247 return GNUNET_SYSERR;
1250 ctx.ret = GNUNET_OK;
1251 ctx.counter_total = 0;
1252 ctx.counter_added = 0;
1253 ctx.plugins_find = plugins_find;
1254 *hello = GNUNET_HELLO_create (pubkey,
1255 &add_address_to_hello,
1259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1260 "HELLO URI contained %u addresses, added %u addresses\n",
1268 /* end of hello.c */